# US 10,770,916 B2 · Two-level LED security light with motion sensor

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 10,770,916 B2
- Document ID: US10770916B2
- Status: Granted
- Kind: B2
- Application number: 16/668,599
- Filed: 2019-10-30
- Published: 2020-02-27
- Granted: 2020-09-08
- Earliest claimed: 2011-08-31
- Assignees: Vaxcel International Co., Ltd.
- Applicants: Vaxcel International Co., Ltd.
- Inventors: Chia-Teh Chen
- Web page: https://patentgrep.com/patent/US10770916B2

## CPC

- G08B 15/00: Identifying, scaring or incapacitating burglars, thieves or intruders, e.g. by explosives
- F21S 9/03: rechargeable by exposure to light
- F21V 17/02: with provision for adjustment (F21V17/04 - F21V17/08 take precedence)
- G08B 5/36: using visible light sources
- G08B 13/1895: {using light change detection systems (G08B13/194 takes precedence)}
- G08B 15/002: {with occupancy simulation}
- H02J 7/35: with light sensitive cells
- H05B 39/042: {by measuring the incident light}
- H05B 39/044: {continuously (H05B39/042 takes precedence)}
- H05B 45/10: Controlling the intensity of the light
- H05B 45/12: using optical feedback
- H05B 45/14: using electrical feedback from LEDs or from LED modules
- H05B 45/20: Controlling the colour of the light
- H05B 45/37: Converter circuits
- H05B 45/44: with an active control inside an LED matrix
- H05B 45/46: having LEDs disposed in parallel lines
- H05B 45/48: having LEDs organised in strings and incorporating parallel shunting devices
- H05B 47/10: Controlling the light source
- H05B 47/105: in response to determined parameters
- H05B 47/11: by determining the brightness or colour temperature of ambient light
- H05B 47/115: by determining the presence or movement of objects or living beings
- H05B 47/16: by timing means
- F21Y 2115/10: Light-emitting diodes [LED]
- G08B 13/00: Burglar, theft or intruder alarms
- G08B 13/189: using passive radiation detection systems
- Y02B 10/10: Photovoltaic [PV]
- Y02B 20/40: Control techniques providing energy savings, e.g. smart controller or presence detection
- G08B: SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- F21S: NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21V: FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- F21Y: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- Y02B: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS

## Abstract

A method of configuring an LED light with a tunable diffused light color temperature is disclosed. The method comprises using a light-emitting unit configured with a first LED load emitting light with a low color temperature and a second LED load emitting light with a high color temperature electrically connected in parallel, using a light diffuser to cover the first LED load and the second LED load to create a diffused light with a diffused light color temperature, using two semiconductor switching devices working in conjunction with a controller to respectively control a first electric power delivered to the first LED load and a second electric power delivered to the second LED load to operate a color temperature tuning and switching scheme and using a first external control device to output at least one first external control signal to activate a selection of a diffused light color temperature.

## Claims

### Claim 1

An LED security light comprising:
a light-emitting unit comprising a plurality of LEDs divided into two LED loads connected in parallel, including a first LED load with N number LEDs emitting light with a low light color temperature and a second LED load with M number LEDs emitting light with a high light color temperature, wherein M and N are positive integers;
a light diffuser covering the first LED load and the second LED load to create a diffused light with a diffused light color temperature;
a loading and power control unit;
a light sensing control unit;
a power supply unit; and
an external control unit including at least a first external control device outputting at least one first external control signal to tune and to select the diffused light color temperature;
wherein the loading and power control unit comprises a controller and a switching circuitry, wherein the switching circuitry is electrically coupled between at least one DC power source of the power supply unit and the light-emitting unit for controlling and delivering at least one DC power to the light-emitting unit, wherein the switching circuitry comprises a first semiconductor switching device electrically connected to the first LED load and a second semiconductor switching device electrically connected to the second LED load;
wherein the controller is electrically coupled with the first semiconductor switching device, the second semiconductor switching device, the light sensing control unit and at least the first external control device;
wherein when the light-emitting unit is in a turned on state, the controller further outputs a first control signal to control a first conduction rate of the first semiconductor switching device and a second control signal to control a second conduction rate of the second semiconductor switching device to respectively deliver a first electric power to the first LED load and a second electric power to the second LED load to generate the diffused light with the diffused light color temperature thru the diffuser according to the at least one first external control signal;
wherein for tuning the diffused light color temperature to a lower diffused light color temperature, the controller upon receiving the at least one first external control signal operates to increase the first conduction rate of the first semiconductor switching device to increase the first electric power delivered to the first LED load and simultaneously operates to decrease the second conduction rate of the second semiconductor switching device to decrease the second electric power delivered to the second LED load with the same pace such that a total diffused light intensity generated by the light-emitting unit remains essentially unchanged while the diffused light color temperature is accordingly adjusted to the lower diffused light color temperature;
wherein for tuning the diffused light color temperature to a higher diffused light color temperature, the controller upon receiving the at least one first external control signal operates to decrease the first conduction rate of the first semiconductor switching device to decrease the first electric power delivered to the first LED load and simultaneously operates to increase the second conduction rate of the second semiconductor switching device to increase the second electric power delivered to the second LED load with the same pace such that the total light intensity generated by the light-emitting unit remains essentially unchanged while the diffused light color temperature is accordingly adjusted to the higher diffused light color temperature;
wherein when an ambient light detected by the light sensing control unit is lower than a first predetermined value, the loading and power control unit operates to turn on the light-emitting unit to perform the diffused light with a selected diffused light color temperature;
wherein when the ambient light detected by the light sensing control unit is higher than a second predetermined value, the loading and power control unit manages to turn off all the LEDs in the light-emitting unit;
wherein the N number LEDs of the first LED load and the M number LEDs of the second LED load are respectively designed with a configuration of in series and/or in parallel connections such that when incorporated with a power level setting of the at least one DC power an electric current passing through each LED of the first LED load and each LED of the second LED load remains at an adequate level such that a voltage V across each LED complies with an operating constraint of Vth<V<Vmax featuring electrical characteristics of a LED, where Vth is a threshold voltage required to trigger the LED to start emitting light and Vmax is a maximum operating voltage across the LED to avoid a thermal damage or burning out of LED construction.

### Claim 2 (depends on 1)

The LED security light according to claim 1, wherein when each of the first LED load and the second LED load is configured with a plurality of LEDs electrically connected in series or sets of in parallel connected LEDs electrically connected in series, a working voltage across each of the first LED load and the second LED load is confined in a domain between a minimum voltage equal to the sum of the threshold voltages of all LEDs electrically connected in series or sets of in parallel connected LEDs electrically connected in series and a maximum voltage equal to the sum of the maximum operating voltages of all LEDs electrically connected in series or sets of in parallel connected LEDs electrically connected in series.

### Claim 3 (depends on 2)

The LED security light according to claim 2, wherein when the LED has the voltage V across each LED complying with an operating constraint of 2.5 volts<Vth<V<Vmax<3.5 volts, the first LED load and the second LED load are required to operate with respective working voltages VN and VM confined in domains expressed by NS×2.5 volts<VN<NS×3.5 volts and MS×2.5 volts<VM<MS×3.5 volts, with NS and MS respectively denoting the numbers of series connected LEDs in the first LED load and the second LED load, wherein NS≤N and MS≤M.

### Claim 4 (depends on 1)

The LED security light according to claim 1, wherein the controller is designed with a diffused light color temperature switching scheme comprising a plurality of different diffused light color temperature performances to be activated by the first external control device, wherein different paired combinations of the first conduction rate and the second conduction rate respectively for controlling the first electric power delivered to the first LED load and the second electric power delivered to the second LED load for creating different diffused light color temperature performances are preprogrammed and executed by the controller for operating a pick and play process according to the at least one first external control signal generated by the first external control device for selecting a corresponding diffused light color temperature performance in the diffused light color temperature switching scheme.

### Claim 5 (depends on 4)

The LED security light according to claim 4, wherein the at least one first external control signal is a short power interruption signal generated by operating a main power switch, a push button, a touch sensor or a wireless remote control device, wherein a power interruption detection circuit is electrically coupled with the controller, wherein when the short power interruption signal is detected by the power interruption detection circuit, the controller operates to alternately perform the corresponding diffused light color temperature performance in the diffused light color temperature switching scheme according to a prearranged sequence.

### Claim 6 (depends on 5)

The LED security light according to claim 5, wherein when the main power switch is used for generating the short power interruption signal, the main power switch is turned off and turned back on within a predetermined time interval.

### Claim 7 (depends on 5)

The LED security light according to claim 5, wherein when the push button or the touch sensor is used, a signal detection circuitry is connected to the push button or the touch sensor, wherein when the push button or the touch sensor is operated, a voltage signal is transmitted to the signal detection circuitry to actuate a momentary power interruption and consequently the short power interruption signal is generated and detected by the power interruption detection circuit, the controller accordingly operates to alternately perform the corresponding diffused light color temperature performance in the diffused light color temperature switching scheme according to a prearranged sequence.

### Claim 8 (depends on 4)

The LED security light according to claim 4, wherein the first external control device is a voltage divider operated by a user to output a plurality of voltage signals interpretable by the controller for executing the pick and play process for respectively selecting and performing the corresponding diffused light color temperature performance in the diffused light color temperature switching scheme; wherein the voltage divider is configured to output the plurality of voltage signals respectively represented by a voltage value, wherein the controller operates to activate the diffused light color temperature switching scheme to generate a corresponding diffused light color temperature performance in the diffused light color temperature switching scheme according to the voltage value outputted by the voltage divider.

### Claim 9 (depends on 8)

The LED security light according to claim 8, wherein the voltage divider is operated with a configuration of a slide switch, a rotary switch, or a pull chain switch, designed with a plurality of switching positions operable by a user for selecting and performing the corresponding diffused light color temperature performance from the diffused light color temperature switching scheme.

### Claim 10 (depends on 4)

The LED security light according to claim 4, wherein the first external control device is a wireless remote control device comprising at least one wireless external signal receiver electrically coupled with the controller to receive at least one wireless external control signal and convert the at least one wireless external control signal into the at least one first external control signal interpretable by the controller for activating the pick and play process to select and perform the corresponding diffused light color temperature performance in the diffused light color temperature switching scheme.

### Claim 11 (depends on 4)

The LED security light according to claim 4, wherein the first external control device is an active infrared ray sensor for detecting an infrared light reflected from an object and converting the infrared light reflected from the object into the at least one first external control signal interpretable by the controller for executing the pick and play process for selecting and performing the corresponding diffused light color temperature performance from the diffused light color temperature switching scheme.

### Claim 12 (depends on 4)

The LED security light according to claim 4, wherein the diffused light color temperature switching scheme comprises at least a high diffused light color temperature performance and a low diffused light color temperature performance, wherein for performing the high diffused light color temperature performance the second semiconductor switching device is fully conducted and the first semiconductor switching device is completely cut off, wherein for performing the low diffused light color temperature performance the first semiconductor switching device is fully conducted and the second semiconductor switching device is completely cut off.

### Claim 13 (depends on 4)

The LED security light according to claim 4, wherein the light color temperature switching scheme comprises at least a high diffused light color temperature performance, a low diffused light color temperature performance and a medium diffused light color temperature performance, wherein for performing the high diffused light color temperature performance the second semiconductor switching device is fully conducted and the first semiconductor switching device is completely cut off, wherein for performing the low diffused light color temperature performance the first semiconductor switching device is fully conducted while the second semiconductor switching device is completely cut off, wherein for performing the medium diffused light color temperature performance the first semiconductor switching device and the second semiconductor switching device are both partially and complementarily conducted such that the total light intensity generated by the light-emitting unit remains essentially unchanged.

### Claim 14 (depends on 13)

The LED security light according to claim 13, wherein the controller is further designed with a free running process to operate a free running performance of the diffused light color temperature switching scheme, wherein a second external control device is designed to output a second external control signal to activate the free running process, wherein the controller manages to operate the free running process to gradually rotate a running pick and play of the diffused light color temperature switching scheme, wherein the free running process operates to perform the low diffused light color temperature performance first for a predetermined short time interval, and then is switched to perform the medium diffused light color temperature performance for the predetermined short time interval, and then is switched to perform the high diffused light color temperature performance for the predetermined short time interval to complete a free running cycle, the free running cycle continues till the second external control signal is ceased or till the second external control device outputs another second external control signal to end the free running process.

### Claim 15 (depends on 4)

The LED security light according to claim 4, wherein the at least one external control device is a push button or a touch sensor, wherein when the push button or the touch sensor is operated, the controller accordingly operates to activate the pick and play process to alternately perform one of the diffused light color temperatures in the diffused light color temperature switching scheme according to a prearranged sequence.

### Claim 16 (depends on 4)

The LED security light according to claim 4, wherein the at least one external control device is a selection switch electrically connectable to a plurality of switching positions with each switching position being electrically and respectively coupled with a control pin of the controller, wherein when the selection switch is connected to one of the plurality of switching positions a constant voltage signal is delivered to a corresponding control pin of the controller to activate the diffused light color temperature switching scheme for selecting the corresponding diffused light color temperature.

### Claim 17 (depends on 1)

The LED security light according to claim 1, wherein M is equal to N.

### Claim 18 (depends on 1)

The LED security light according to claim 1, wherein M is smaller than N.

### Claim 19 (depends on 1)

The LED security light according to claim 1, wherein the low color temperature is designed in a range between 2000 K and 3000 K, the high color temperature is designed in the range between 5000 K and 6500 K.

### Claim 20

An LED security light comprising:
a light-emitting unit comprising a plurality of LEDs divided into two LED loads connected in parallel, including a first LED load with N number LEDs emitting light with a low light color temperature and a second LED load with M number LEDs emitting light with a high light color temperature, wherein M and N are positive integers;
a light diffuser covering the first LED load and the second LED load to create a diffused light with a diffused light color temperature;
a loading and power control unit;
a light sensing control unit;
a motion sensing unit;
a power supply unit; and
an external control unit including at least a first external control device outputting at least one first external control signal to tune and to select the diffused light color temperature;
wherein the loading and power control unit comprises a controller and a switching circuitry, wherein the switching circuitry is electrically coupled between at least one DC power source of the power supply unit and the light-emitting unit for controlling and delivering at least one DC power to the light-emitting unit, wherein the switching circuitry comprises a first semiconductor switching device electrically connected to the first LED load and a second semiconductor switching device electrically connected to the second LED load;
wherein the controller is electrically coupled with the first semiconductor switching device, the second semiconductor switching device, the light sensing control unit, the motion sensing unit and at least the first external control device;
wherein when the light-emitting unit is in a turned on state, the controller further outputs a first control signal to control a first conduction rate of the first semiconductor switching device and a second control signal to control a second conduction rate of the second semiconductor switching device to respectively deliver a first electric power to the first LED load and a second electric power to the second LED load to generate the diffused light with the diffused light color temperature thru the diffuser according to the at least one first external control signal;
wherein for tuning the diffused light color temperature to a lower diffused light color temperature, the controller upon receiving the at least one first external control signal operates to increase the first conduction rate of the first semiconductor switching device to increase the first electric power delivered to the first LED load and simultaneously operates to decrease the second conduction rate of the second semiconductor switching device to decrease the second electric power delivered to the second LED load with the same pace such that a total diffused light intensity generated by the light-emitting unit remains essentially unchanged while the diffused light color temperature is accordingly adjusted to the lower diffused light color temperature;
wherein for tuning the diffused light color temperature to a higher diffused light color temperature, the controller upon receiving the at least one first external control signal operates to decrease the first conduction rate of the first semiconductor switching device to decrease the first electric power delivered to the first LED load and simultaneously operates to increase the second conduction rate of the second semiconductor switching device to increase the second electric power delivered to the second LED load with the same pace such that the total light intensity generated by the light-emitting unit remains essentially unchanged while the diffused light color temperature is accordingly adjusted to the higher diffused light color temperature;
wherein when an ambient light detected by the light sensing control unit is lower than a first predetermined value, the loading and power control unit operates to activate the motion sensing unit;
wherein when a motion intrusion is detected by the motion sensing unit, the loading and power control unit operates to deliver an electric power to the light-emitting unit to generate a high level illumination with a selected diffused light color temperature according to a sensing signal received from the motion sensing unit for a predetermined time duration before resuming to a turned off state of the light-emitting unit;
wherein when the ambient light detected by the light sensing control unit is higher than a second predetermined value, the loading and power control unit manages to deactivate the motion sensing unit and turn off all LEDs of the light-emitting unit;
wherein the N number LEDs of the first LED load and the M number LEDs of the second LED load are respectively designed with a configuration of in series and/or in parallel connections such that when incorporated with a power level setting of the at least one DC power an electric current passing through each LED of the first LED load and each LED of the second LED load remains at an adequate level such that a voltage V across each LED complies with an operating constraint of Vth<V<Vmax featuring electrical characteristics of a LED, where Vth is a threshold voltage required to trigger the LED to start emitting light and Vmax is a maximum operating voltage across the LED to avoid a thermal damage or burning out of LED construction.

### Claim 21 (depends on 20)

The LED security light according to claim 20, wherein when each of the first LED load and the second LED load is configured with a plurality of LEDs electrically connected in series or sets of in parallel connected LEDs electrically connected in series, a working voltage across each of the first LED load and the second LED load is confined in a domain between a minimum voltage equal to the sum of the threshold voltages of all LEDs electrically connected in series or sets of in parallel connected LEDs electrically connected in series and a maximum operating voltage equal to the sum of the maximum operating voltages of all LEDs electrically connected in series or sets of in parallel connected LEDs electrically connected in series.

### Claim 22 (depends on 21)

The LED security light according to claim 21, wherein when the LED has the voltage V across each LED complying with an operating constraint of 2.5 volts<Vth<V<Vmax<3.5 volts, the first LED load and the second LED load are required to operate with respective working voltages VN and VM confined in domains expressed by NS×2.5 volts<VN<NS×3.5 volts and MS×2.5 volts<VM<MS×3.5 volts, with NS and MS respectively denoting the numbers of series connected LEDs in the first LED load and the second LED load, wherein NS≤N and MS≤M.

### Claim 23 (depends on 20)

The LED security light according to claim 20, wherein the controller is designed with a diffused light color temperature switching scheme comprising a plurality of different diffused light color temperature performances to be activated by the first external control device, wherein different paired combinations of the first conduction rate and the second conduction rate respectively for controlling the first electric power delivered to the first LED load and the second electric power delivered to the second LED load for creating different diffused light color temperatures are preprogrammed and executed by the controller for operating a pick and play process according to the at least one first external control signal generated by the first external control device for selecting a corresponding diffused light color temperature performance in the diffused light color temperature switching scheme.

### Claim 24 (depends on 23)

The LED security light according to claim 23, wherein the at least one first external control signal is a short power interruption signal generated by operating a main power switch, a push button, a touch sensor or a wireless remote control device, wherein a power interruption detection circuit is electrically coupled with the controller, wherein when the short power interruption signal is detected by the power interruption detection circuit, the controller operates to alternately perform the corresponding diffused light color temperature performance in the diffused light color temperature switching scheme according to a prearranged sequence.

### Claim 25 (depends on 24)

The LED security light according to claim 24, wherein when the main power switch is used for generating the short power interruption signal, the main power switch is turned off and turned back on within a predetermined time interval.

### Claim 26 (depends on 24)

The LED security light according to claim 24, wherein when the push button or the touch sensor is used, a signal detection circuitry is connected to the push button or the touch sensor, wherein when the push button or the touch sensor is operated, a voltage signal is transmitted to the signal detection circuitry to actuate a momentary power interruption and consequently the short power interruption signal is generated and detected by the power interruption detection circuit, the controller accordingly operates to alternately perform the corresponding diffused light color temperature performance in the diffused light color temperature switching scheme according to a prearranged sequence.

### Claim 27 (depends on 23)

The LED security light according to claim 23, wherein the first external control device is a voltage divider operated by a user to output a plurality of voltage signals interpretable by the controller for executing the pick and play process for respectively selecting and performing the corresponding diffused light color temperature performance in the diffused light color temperature switching scheme; wherein the voltage divider is configured to output the plurality of voltage signals respectively represented by a voltage value, wherein the controller operates to activate the diffused light color temperature switching scheme to generate a corresponding diffused light color temperature performance in the diffused light color temperature switching scheme according to the voltage value outputted by the voltage divider.

### Claim 28 (depends on 12)

The LED security light according to claim 12, wherein the voltage divider is operated with a configuration of a slide switch, a rotary switch, or a pull chain switch, designed with a plurality of switching positions operable by a user for selecting and performing the corresponding diffused light color temperature performance from the diffused light color temperature switching scheme.

### Claim 29 (depends on 23)

The LED security light according to claim 23, wherein the first external control device is a wireless remote control device comprising at least one wireless external signal receiver electrically coupled with the controller to receive at least one wireless external control signal and convert the at least one wireless external control signal into the at least one first external control signal interpretable by the controller for activating the pick and play process to select and perform the corresponding diffused light color temperature performance in the diffused light color temperature switching scheme.

### Claim 30 (depends on 23)

The LED security light according to claim 23, wherein the first external control device is an active infrared ray sensor for detecting an infrared light reflected from an object and converting the infrared light reflected from the object into the at least one first external control signal interpretable by the controller for executing the pick and play process for selecting and performing the corresponding diffused light color temperature performance from the diffused light color temperature switching scheme.

### Claim 31 (depends on 23)

The LED security light according to claim 23, wherein the diffused light color temperature switching scheme comprises at least a high diffused light color temperature performance and a low diffused light color temperature performance, wherein for performing the high diffused light color temperature performance the second semiconductor switching device is fully conducted and the first semiconductor switching device is completely cut off, wherein for performing the low diffused light color temperature performance the first semiconductor switching device is fully conducted and the second semiconductor switching device is completely cut off.

### Claim 32 (depends on 23)

The LED security light according to claim 23, wherein the diffused light color temperature switching scheme comprises at least a high diffused light color temperature performance, a low diffused light color temperature performance and a medium diffused light color temperature performance, wherein for performing the high diffused light color temperature performance the second semiconductor switching device is fully conducted and the first semiconductor switching device is completely cut off, wherein for performing the low diffused light color temperature performance the first semiconductor switching device is fully conducted while the second semiconductor switching device is completely cut off, wherein for performing the medium diffused light color temperature performance the first semiconductor switching device and the second semiconductor switching device are both partially and complementarily conducted such that the total light intensity generated by the light-emitting unit remains essentially unchanged.

### Claim 33 (depends on 32)

The LED security light according to claim 32, wherein the controller is further designed with a free running process to operate a free running performance of the diffused light color temperature switching scheme, wherein a second external control device is designed to output a second external control signal to activate the free running process, wherein the controller manages to operate the free running process to gradually rotate a running pick and play of the diffused light color temperature switching scheme, wherein the free running process operates to perform the low diffused light color temperature performance first for a predetermined short time interval, and then is switched to perform the medium diffused light color temperature performance for the predetermined short time interval, and then is switched to perform the high diffused light color temperature performance for the predetermined short time interval to complete a free running cycle, the free running cycle continues till the second external control signal is ceased or till the second external control device outputs another second external control signal to end the free running process.

### Claim 34 (depends on 23)

The LED security light according to claim 23, wherein the at least one external control device is a push button or a touch sensor, wherein when the push button or the touch sensor is operated, the controller accordingly operates to activate the pick and play process to alternately perform one of the diffused light color temperatures in the diffused light color temperature switching scheme according to a prearranged sequence.

### Claim 35 (depends on 23)

The LED security light according to claim 23, wherein the at least one external control device is a selection switch electrically connectable to a plurality of switching positions with each switching position being electrically and respectively coupled with a control pin of the controller, wherein when the selection switch is connected to one of the plurality of switching positions a constant voltage signal is delivered to a corresponding control pin of the controller to activate the diffused light color temperature switching scheme for selecting the corresponding diffused light color temperature.

### Claim 36 (depends on 20)

The LED security light according to claim 20, wherein M is equal to N.

### Claim 37 (depends on 20)

The LED security light according to claim 20, wherein M is smaller than N.

### Claim 38 (depends on 20)

The LED security light according to claim 20, wherein the low color temperature is designed in a range between 2000 K and 3000 K, the high color temperature is designed in the range between 5000 K and 6500 K.

### Claim 39

A method of configuring an LED lighting device with a tunable diffused light color temperature, comprising:
using a light-emitting unit comprising a plurality of LEDs being divided into at least two LED loads including at least a first LED load with N number LEDs emitting light with a low color temperature and at least a second LED load with M number LEDs emitting light with a high color temperature; the first LED load and the second LED load being electrically connected in parallel;
using a light diffuser covering the first LED load and the second LED load to create a diffused light with a diffused light color temperature;
using an LED driver circuitry electrically coupled between a power source and the light-emitting unit to output at least one DC power to the light-emitting unit;
using a first semiconductor switching device electrically connected between the LED driver circuitry and the first LED load to control a power level of a first electric power delivered to the first LED load;
using a second semiconductor switching device electrically connected between the LED driver circuitry and the second LED load to control a power level of a second electric power delivered to the second LED load;
using a controller, electrically coupled with the first semiconductor switching device and the second semiconductor switching device to respectively control a first conduction rate of the first semiconductor switching device and a second conduction rate of the second semiconductor switching device;
using at least a first external control device electrically coupled with the controller to output at least one first external control signal to tune and to select a corresponding diffused light color temperature performance;
wherein when the light-emitting unit is in a turned on state, the controller outputs the first control signal to control the first conduction rate of the first semiconductor switching device and the second control signal to control the second conduction rate of the second semiconductor switching device to respectively deliver the first electric power to the first LED load and the second electric power to the second LED load to generate the diffused light with the diffused light color temperature thru the diffuser according to the at least one first external control signal;
wherein for tuning the diffused light color temperature to a lower diffused light color temperature, the controller upon receiving the at least one first external control signal operates to increase the first conduction rate of the first semiconductor switching device to increase the first electric power delivered to the first LED load and simultaneously operates to decrease the second conduction rate of the second semiconductor switching device to decrease the second electric power delivered to the second LED load with the same pace such that a total diffused light intensity generated by the light-emitting unit remains essentially unchanged while the diffused light color temperature is accordingly adjusted to the lower diffused light color temperature;
wherein for tuning the diffused light color temperature to a higher diffused light color temperature, the controller upon receiving the at least one first external control signal operates to decrease the first conduction rate of the first semiconductor switching device to decrease the first electric power delivered to the first LED load and simultaneously operates to increase the second conduction rate of the second semiconductor switching device to increase the second electric power delivered to the second LED load with the same pace such that the total light intensity generated by the light-emitting unit remains essentially unchanged while the diffused light color temperature is accordingly adjusted to the higher diffused light color temperature;
wherein the first LED load and the second LED load are respectively designed with a configuration of in series and/or in parallel connections such that when incorporated with a power level setting of the at least one DC power an electric current passing through each LED of the first LED load and each LED of the second LED load remains at an adequate level such that a voltage V across each LED complies with an operating constraint of Vth<V<Vmax featuring electrical characteristics of a LED, where Vth is a threshold voltage required to trigger the LED to start emitting light and Vmax is a maximum operating voltage across the LED to avoid a thermal damage or burning out of LED construction.

### Claim 40 (depends on 39)

The method of configuring an LED lighting device with a tunable diffused light color temperature according to claim 39, wherein the controller is designed with a diffused light color temperature switching scheme comprising a plurality of different diffused light color temperature performances to be respectively activated by the at least one first external control signal generated by the first external control device, wherein different paired combinations of the first conduction rate and the second conduction rate respectively for controlling the first electric power delivered to the first LED load and the second electric power delivered to the second LED load for creating different diffused light color temperatures are preprogrammed and executed by the controller for operating a pick and play process according to the at least one first external control signal generated by the first external control device for selecting a corresponding diffused light color temperature performance in the diffused light color temperature switching scheme.

### Claim 41 (depends on 40)

The method of configuring an LED lighting device with a tunable diffused light color temperature according to claim 40, wherein the at least one first external control signal is a short power interruption signal generated by operating a main power switch, a push button, a touch sensor or a wireless remote control device, wherein a power interruption detection circuit is electrically coupled with the controller, wherein when the short power interruption signal is detected by the power interruption detection circuit, the controller operates to alternately perform the corresponding diffused light color temperature performance in the diffused light color temperature switching scheme according to a prearranged sequence.

### Claim 42 (depends on 41)

The method of configuring an LED lighting device with a tunable diffused light color temperature according to claim 41, wherein when the main power switch is used for generating the short power interruption signal, the main power switch is turned off and turned back on within a predetermined time interval.

### Claim 43 (depends on 41)

The method of configuring an LED lighting device with a tunable diffused light color temperature according to claim 41, wherein when the push button or the touch sensor is used, a signal detection circuitry is connected to the push button or the touch sensor, wherein when the push button or the touch sensor is operated, a voltage signal is transmitted to the signal detection circuitry to actuate a momentary power interruption and consequently the short power interruption signal is generated and detected by the power interruption detection circuit, the controller accordingly operates to alternately perform the corresponding diffused light color temperature performance in the diffused light color temperature switching scheme according to the prearranged sequence.

### Claim 44 (depends on 40)

The method of configuring an LED lighting device with a tunable diffused light color temperature according to claim 40, wherein the first external control device is a voltage divider operated by a user to output a plurality of voltage signals interpretable by the controller for executing the pick and play process for respectively selecting and performing the corresponding diffused light color temperature performance in the diffused light color temperature switching scheme; wherein the voltage divider is configured to output the plurality of voltage signals respectively represented by a voltage value, wherein the controller operates to activate the diffused light color temperature switching scheme to generate a corresponding diffused light color temperature performance in the diffused light color temperature switching scheme according to the voltage value outputted by the voltage divider.

### Claim 45 (depends on 44)

The method of configuring an LED lighting device with a tunable diffused light color temperature according to claim 44, wherein the voltage divider is operated with a configuration of a slide switch, a rotary switch, or a pull chain switch, designed with a plurality of switching positions operable by a user for selecting and performing the corresponding diffused light color temperature performance from the diffused light color temperature switching scheme.

### Claim 46 (depends on 40)

The method of configuring an LED lighting device with a tunable diffused light color temperature according to claim 40, wherein the first external control device is a wireless remote control device comprising at least one wireless external signal receiver electrically coupled with the controller to receive at least one wireless external control signal and convert the at least one wireless external control signal into the at least one first external control signal interpretable by the controller for activating the pick and play process to select and perform the corresponding diffused light color temperature performance in the diffused light color temperature switching scheme.

### Claim 47 (depends on 40)

The method of configuring an LED lighting device with a tunable diffused light color temperature according to claim 40, wherein the first external control device is an active infrared ray sensor for detecting an infrared light reflected from an object and converting the infrared light reflected from the object into the at least one first external control signal interpretable by the controller for executing the pick and play process for selecting and performing the corresponding diffused light color temperature performance from the diffused light color temperature switching scheme.

### Claim 48 (depends on 40)

The method of configuring an LED lighting device with a tunable diffused light color temperature according to claim 40, wherein the diffused light color temperature switching scheme comprises at least a high diffused light color temperature performance and a low diffused light color temperature performance, wherein for performing the high diffused light color temperature performance the second semiconductor switching device is fully conducted and the first semiconductor switching device is completely cut off, wherein for performing the low diffused light color temperature performance the first semiconductor switching device is fully conducted and the second semiconductor switching device is completely cut off.

### Claim 49 (depends on 40)

The method of configuring an LED lighting device with a tunable diffused light color temperature according to claim 40, wherein the diffused light color temperature switching scheme comprises at least a high diffused light color temperature performance, a low diffused light color temperature performance and a medium diffused light color temperature performance, wherein for performing the high diffused light color temperature performance the second semiconductor switching device is fully conducted and the first semiconductor switching device is completely cut off, wherein for performing the low diffused light color temperature performance the first semiconductor switching device is fully conducted while the second semiconductor switching device is completely cut off, wherein for performing the medium diffused light color temperature performance the first semiconductor switching device and the second semiconductor switching device are both partially and complementarily conducted such that the total light intensity generated by the light-emitting unit remains essentially unchanged.

### Claim 50 (depends on 49)

The method of configuring an LED lighting device with a tunable diffused light color temperature according claim 49, wherein the controller is further designed with a free running process to operate a free running performance of the diffused light color temperature switching scheme, wherein a second external control device is designed to output a second external control signal to activate the free running process, wherein the controller manages to operate the free running process to gradually rotate a running pick and play of the diffused light color temperature switching scheme, wherein the free running process operates to perform the low diffused light color temperature performance first for a predetermined short time interval, and then is switched to perform the medium diffused light color temperature performance for the predetermined short time interval, and then is switched to perform the high diffused light color temperature performance for the predetermined short time interval to complete a free running cycle, the free running cycle continues till the second external control signal is ceased or till the second external control device outputs another second external control signal to end the free running process.

### Claim 51 (depends on 40)

The method of configuring an LED lighting device with a tunable diffused light color temperature according to claim 40, wherein the at least one external control device is a push button or a touch sensor, wherein when the push button or the touch sensor is operated the controller accordingly operates to activate the pick and play process to alternately perform one of the diffused light color temperatures in the diffused light color temperature switching scheme according to a prearranged sequence.

### Claim 52 (depends on 40)

The method of configuring an LED lighting device with a tunable diffused light color temperature according to claim 40, wherein the at least one external control device is a selection switch electrically connectable to a plurality of switching positions with each switching position being electrically and respectively coupled with a control pin of the controller, wherein when the selection switch is connected to one of the plurality of switching positions a constant voltage signal is delivered to a corresponding control pin of the controller to activate the diffused light color temperature switching scheme for selecting the corresponding diffused light color temperature.

### Claim 53 (depends on 39)

The method of configuring an LED lighting device with a tunable diffused light color temperature according to claim 39, wherein when each of the first LED load and the second LED load is configured with a plurality of LEDs electrically connected in series or sets of in parallel connected LEDs electrically connected in series, a working voltage across each of the first LED load and the second LED load is confined in a domain between a minimum voltage equal to the sum of the threshold voltages of all LEDs electrically connected in series or sets of in parallel connected LEDs electrically connected in series and a maximum voltage equal to the sum of the maximum operating voltages of all LEDs electrically connected in series or sets of in parallel connected LEDs electrically connected in series.

### Claim 54 (depends on 53)

The method of configuring an LED lighting device with a tunable diffused light color temperature according to claim 53, wherein when the LED has the voltage V across each LED complying with an operating constraint of 2.5 volts<Vth<V<Vmax<3.5 volts, the first LED load and the second LED load are required to operate with respective working voltages VN and VM confined in domains expressed by NS×2.5 volts<VN<NS×3.5 volts and MS×2.5 volts<VM<MS×3.5 volts, with NS and MS respectively denoting the numbers of series connected LEDs in the first LED load and the second LED load, wherein NS≤N and MS≤M.

### Claim 55 (depends on 39)

The method of configuring an LED lighting device with a tunable diffused light color temperature according to claim 39, wherein the low color temperature is designed in a range between 2000 K and 3000 K, the high color temperature is designed in the range between 5000 K and 6500 K.

### Claim 56

An LED lighting device configured with a tunable diffused light color temperature, comprising:
a light-emitting unit comprising a plurality of LEDs divided into at least two LED loads including at least a first LED load with N number LEDs emitting light with a low color temperature and at least a second LED load with M number LEDs emitting light with a high color temperature; the first LED load and the second LED load being electrically connected in parallel;
a light diffuser covering the first LED load and the second LED load to create a diffused light with a diffused light color temperature;
an LED driver circuitry electrically connected to at least one power source to output at least one DC power to the light-emitting unit;
a first semiconductor switching device electrically connected between the LED driver circuitry and the first LED load;
a second semiconductor switching device electrically connected between the LED driver circuitry and the second LED load;
at least a first external control device to output at least one first external control signal to tune and to select a corresponding diffused light color temperature performance; and
a controller, electrically coupled with the first semiconductor switching device, the second semiconductor switching device and at least the first external control device;
wherein when the light-emitting unit is in a turned on state, the controller outputs a first control signal to control a first conduction rate of the first semiconductor switching device and a second control signal to control the second conduction rate of the second semiconductor switching device to respectively deliver a first electric power to the first LED load and a second electric power to the second LED load to generate the diffused light with the diffused light color temperature thru the diffuser according to the at least one first external control signal;
wherein for tuning the diffused light color temperature to a lower diffused light color temperature, the controller upon receiving the at least one first external control signal operates to increase the first conduction rate of the first semiconductor switching device to increase the first electric power delivered to the first LED load and simultaneously operates to decrease the second conduction rate of the second semiconductor switching device to decrease the second electric power delivered to the second LED load with the same pace such that a total diffused light intensity generated by the light-emitting unit remains essentially unchanged while the diffused light color temperature is accordingly adjusted to the lower diffused light color temperature;
wherein for tuning the diffused light color temperature to a higher diffused light color temperature, the controller upon receiving the at least one first external control signal operates to decrease the first conduction rate of the first semiconductor switching device to decrease the first electric power delivered to the first LED load and simultaneously operates to increase the second conduction rate of the second semiconductor switching device to increase the second electric power delivered to the second LED load with the same pace such that the total light intensity generated by the light-emitting unit remains essentially unchanged while the diffused light color temperature is accordingly adjusted to the higher diffused light color temperature;
wherein the first LED load and the second LED load are respectively designed with a configuration of in series and/or in parallel connections such that when incorporated with a power level setting of the at least one DC power an electric current passing through each LED of the first LED load and each LED of the second LED load remains at an adequate level such that a voltage V across each LED complies with an operating constraint of Vth<V<Vmax featuring electrical characteristics of a LED, where Vth is a threshold voltage required to trigger the LED to start emitting light and Vmax is a maximum operating voltage across the LED to avoid a thermal damage or burning out of LED construction.

### Claim 57 (depends on 56)

The LED lighting device configured with a tunable diffused light color temperature according to claim 56, wherein the at least one power source is an AC power source.

### Claim 58 (depends on 56)

The LED lighting device configured with a tunable diffused light color temperature according to claim 56, wherein the light-emitting unit is turned on by a power switch.

### Claim 59 (depends on 56)

The LED lighting device configured with a tunable diffused light color temperature according to claim 56, wherein the at least one power source is a DC power source, wherein the switching circuitry comprises a constant current circuitry outputting a constant current power.

### Claim 60 (depends on 56)

The LED lighting device configured with a tunable diffused light color temperature according to claim 56, wherein the light-emitting unit is turned on by a photo sensor and/or a motion sensor.

### Claim 61 (depends on 56)

The LED lighting device configured with a tunable diffused light color temperature according to claim 56, wherein the light-emitting unit is turned on by a wireless external control signal received from a wireless remote control device, a smart phone or a smart speaker.

### Claim 62 (depends on 56)

The LED lighting device configured with a tunable diffused light color temperature according to claim 56, wherein the controller is designed with a diffused light color temperature switching scheme comprising a plurality of different diffused light color temperature performances to be respectively activated by the at least one first external control signal generated by the first external control device, wherein different paired combinations of the first conduction rate and the second conduction rate respectively for controlling the first electric power delivered to the first LED load and the second electric power delivered to the second LED load for creating different diffused light color temperatures are preprogrammed and executed by the controller for operating a pick and play process according to the at least one first external control signal generated by the first external control device for selecting a corresponding diffused light color temperature performance in the diffused light color temperature switching scheme.

### Claim 63 (depends on 62)

The LED lighting device configured with a tunable diffused light color temperature according to claim 62, wherein the at least one first external control signal is a short power interruption signal generated by operating a main power switch, a push button, a touch sensor or a wireless remote control device wherein a power interruption detection circuit is electrically coupled with the controller, wherein when the short power interruption signal is detected by the power interruption detection circuit, the controller operates to alternately perform the corresponding diffused light color temperature performance in the diffused light color temperature switching scheme according to a prearranged sequence.

### Claim 64 (depends on 63)

The LED lighting device configured with a tunable diffused light color temperature according to claim 63, wherein when the main power switch is used for generating the short power interruption signal, the main power switch is turned off and turned back on within a predetermined time interval.

### Claim 65 (depends on 63)

The LED lighting device configured with a tunable diffused light color temperature according to claim 63, wherein when the push button or the touch sensor is used, a signal detection circuitry is connected to the push button switch or the touch sensor, wherein when the push button or the touch sensor is operated, a voltage signal is transmitted to the signal detection circuitry to actuate a momentary power interruption and consequently the short power interruption signal is generated and detected by the power interruption detection circuit, the controller accordingly operates to alternately perform the corresponding diffused light color temperature performance in the diffused light color temperature switching scheme according to the prearranged sequence.

### Claim 66 (depends on 62)

The LED lighting device configured with a tunable diffused light color temperature according to claim 62, wherein the first external control device is a voltage divider operated by a user to output a plurality of voltage signals interpretable by the controller for executing the pick and play process for respectively selecting and performing the corresponding diffused light color temperature performance in the diffused light color temperature switching scheme; wherein the voltage divider is configured to output the plurality of voltage signals respectively represented by a voltage value, wherein the controller operates to activate the diffused light color temperature switching scheme to generate a corresponding diffused light color temperature performance in the diffused light color temperature switching scheme according to the voltage value outputted by the voltage divider.

### Claim 67 (depends on 66)

The LED lighting device configured with a tunable diffused light color temperature according to claim 66, wherein the voltage divider is operated with a configuration of a slide switch, a rotary switch, or a pull chain switch, designed with a plurality of switching positions operable by a user for selecting and performing the corresponding diffused light color temperature performance from the diffused light color temperature switching scheme.

### Claim 68 (depends on 62)

The LED lighting device configured with a tunable diffused light color temperature according to claim 62, wherein the first external control device is a wireless remote control device comprising at least one wireless external signal receiver electrically coupled with the controller to receive at least one wireless external control signal and convert the at least one wireless external control signal into the at least one first external control signal interpretable by the controller for activating the pick and play process to select and perform the corresponding diffused light color temperature performance in the diffused light color temperature switching scheme.

### Claim 69 (depends on 62)

The LED lighting device configured with a tunable diffused light color temperature according to claim 62, wherein the first external control device is an active infrared ray sensor for detecting an infrared light reflected from an object and converting the infrared light reflected from the object into the at least one first external control signal interpretable by the controller for executing the pick and play process for selecting and performing the corresponding diffused light color temperature performance from the diffused light color temperature switching scheme.

### Claim 70 (depends on 62)

The LED lighting device configured with a tunable diffused light color temperature according to claim 62, wherein the diffused light color temperature switching scheme comprises at least a high diffused light color temperature performance and a low diffused light color temperature performance, wherein for performing the high diffused light color temperature performance the second semiconductor switching device is fully conducted and the first semiconductor switching device is completely cut off, wherein for performing the low diffused light color temperature performance the first semiconductor switching device is fully conducted and the second semiconductor switching device is completely cut off.

### Claim 71 (depends on 62)

The LED lighting device configured with a tunable diffused light color temperature according to claim 62, wherein the light color temperature switching scheme comprises at least a high diffused light color temperature performance, at least a medium diffused light color temperature performance and at least a low diffused light color temperature performance; wherein for performing the high diffused light color temperature performance the second semiconductor switching device is fully conducted and the first semiconductor switching device is completely cut off, wherein for performing the medium diffused light color temperature the first semiconductor switching device and the second semiconductor switching device are partially and complementarily conducted such that the total light intensity generated by the light-emitting unit remains essentially unchanged, wherein for performing the low diffused light color temperature performance the first semiconductor switching device is fully conducted while the second semiconductor switching device is completely cut off.

### Claim 72 (depends on 71)

The LED lighting device configured with a tunable diffused light color temperature according to claim 71, wherein the controller is further designed with a free running process to operate a free running performance of the diffused light color temperature switching scheme, wherein a second external control device is designed to output a second external control signal to activate the free running process, wherein the controller manages to operate the free running process to gradually rotate a running pick and play of the diffused light color temperature switching scheme, wherein the free running process operates to perform the low diffused light color temperature performance first for a predetermined short time interval, and then is switched to perform the medium diffused light color temperature performance for the predetermined short time interval, and then is switched to perform the high diffused light color temperature performance for the predetermined short time interval to complete a free running cycle, the free running cycle continues till the second external control signal is ceased or till the second external control device outputs another second external control signal to end the free running process.

### Claim 73 (depends on 62)

The LED lighting device configured with a tunable diffused light color temperature according to claim 62, wherein the at least one external control device is a push button or a touch sensor, wherein when the push button or the touch sensor is operated the controller accordingly operates to activate the pick and play process to alternately perform one of the diffused light color temperatures in the diffused light color temperature switching scheme according to a prearranged sequence.

### Claim 74 (depends on 62)

The LED lighting device configured with a tunable diffused light color temperature according to claim 62, wherein the at least one external control device is a selection switch electrically connectable to a plurality of switching positions with each switching position being electrically and respectively coupled with a control pin of the controller, wherein when the selection switch is connected to one of the plurality of switching positions a constant voltage signal is delivered to a corresponding control pin of the controller to activate the diffused light color temperature switching scheme for selecting the corresponding diffused light color temperature.

### Claim 75 (depends on 56)

The LED lighting device configured with a tunable diffused light color temperature according to claim 56, wherein M is equal to N.

### Claim 76 (depends on 56)

The LED lighting device configured with a tunable diffused light color temperature according to claim 56, wherein M is smaller than N.

### Claim 77 (depends on 56)

The LED lighting device configured with a tunable diffused light color temperature according to claim 56, wherein the low color temperature is designed in a range between 2000 K and 3000 K, the high color temperature is designed in the range between 5000 K and 6500K.

### Claim 78 (depends on 56)

The LED lighting device configured with a tunable diffused light color temperature according to claim 56, wherein the LED lighting device is an LED light bulb, an LED recessed light, an LED ceiling light, an LED pendant light, an LED wall light, an LED under cabinet light, a ceiling fan light kit, a portable LED lamp or any other LED lamp for indoor or outdoor application.

### Claim 79 (depends on 56)

The LED lighting device configured with a tunable diffused light color temperature according to claim 56, wherein when each of the first LED load and the second LED load is configured with a plurality of LEDs electrically connected in series or sets of in parallel connected LEDs electrically connected in series, a working voltage across each of the first LED load and the second LED load is confined in a domain between a minimum voltage equal to the sum of the threshold voltages of all LEDs electrically connected in series or sets of in parallel connected LEDs electrically connected in series and a maximum voltage equal to the sum of the maximum operating voltages of all LEDs electrically connected in series or sets of in parallel connected LEDs electrically connected in series.

### Claim 80 (depends on 79)

The LED lighting device configured with a tunable diffused light color temperature according to claim 79, wherein when the LED has the voltage V across each LED complying with an operating constraint of 2.5 volts<Vth<V<Vmax<3.5 volts, the first LED load and the second LED load are required to operate with respective working voltages VN and VM confined in domains expressed by NS×2.5 volts<VN<NS×3.5 volts and MS×2.5 volts<VM<MS×3.5 volts, with NS and MS respectively denoting the numbers of series connected LEDs in the first LED load and the second LED load, wherein NS≤N and MS≤M.

### Claim 81

An LED lighting device comprising:
a light-emitting unit comprising a plurality of LEDs divided into two LED loads connected in parallel, including a first LED load with N number of LEDs emitting light with a low light color temperature and a second LED load with M number of LEDs emitting light with a high light color temperature, wherein M and N are positive integers;
a light diffuser covering the first LED load and the second LED load to create a diffused light with a diffused light color temperature;
an LED driver circuitry electrically coupled between a power source
and the light-emitting unit to output a DC power;
a loading and power control unit configured with at least a power loading circuitry electrically coupled between the LED driver circuitry and the light-emitting unit to operate a plurality of different power loading options for respectively distributing and loading the DC power between a first electric power delivered to the first LED load and a second electric power delivered to the second LED load, wherein each of the plurality of different power loading options is configured with a paired combination of the first electric power and the second electric power for generating the diffused light with the diffused light color temperature to form a diffused light color temperature switching scheme comprising a plurality of different diffused light color temperature performances for selection; and
an external control unit including at least a first external control device for activating the diffused light color temperature switching scheme and executing a power loading option for performing a corresponding diffused light color temperature performance;
wherein the N number LEDs of the first LED load and the M number LEDs of the second LED load are respectively designed with a configuration of in series and/or in parallel connections such that when incorporated with a power level setting of the DC power an electric current passing through each LED of the first LED load and each LED of the second LED load remains at an adequate level such that a voltage V across each LED complies with an operating constraint of Vth<V<Vmax featuring electrical characteristics of a LED, where Vth is a threshold voltage required to trigger the LED to start emitting light and Vmax is a maximum operating voltage across the LED to avoid a thermal damage or burning out of LED construction.

### Claim 82 (depends on 81)

The LED lighting device according to claim 81, wherein the low light color temperature is designed in a range between 2000 K and 3000 K, wherein the high light color temperature is designed in a range between 5000 K and 6500 K.

### Claim 83 (depends on 81)

The LED lighting device according to claim 81, wherein the power loading circuitry comprises a controller, a first semiconductor switching device and a second semiconductor switching device; wherein the controller is electrically coupled with the first semiconductor switching device, the second semiconductor switching device and the first external control device; wherein the first semiconductor switching device is electrically connected in series between the LED driver circuitry and the first LED load and the second semiconductor switching device is electrically connected in series between the LED driver circuitry and the second LED load; wherein the first external control device outputs at least one first external control signal to activate the diffused light color temperature switching scheme;
wherein the controller outputs a first control signal to control a first conduction rate of the first semiconductor switching device and a second control signal to control a second conduction rate of the second semiconductor switching device to respectively deliver the first electric power to the first LED load and the second electric power to the second LED load; wherein the controller is designed to operate the plurality of different power loading options, wherein different paired combinations of the first conduction rate and the second conduction rate respectively for controlling the first electric power delivered to the first LED load and the second electric power delivered to the second LED load for creating different diffused light color temperatures are preprogrammed and addressable by the controller for operating a pick and play process according to the at least one first external control signal generated by the first external control device for selecting the corresponding diffused light color temperature performance in the diffused light color temperature switching scheme; wherein a total light intensity generated by the light-emitting unit remains essentially unchanged while the diffused light color temperature is alternately adjusted.

### Claim 84 (depends on 83)

The LED lighting device according to claim 83, wherein the at least one first external control signal is a short power interruption signal generated by operating a main power switch, a push button, a touch sensor or a wireless remote control device, wherein a power interruption detection circuit is electrically coupled with the controller, wherein when the short power interruption signal is detected by the power interruption detection circuit, the controller operates to alternately perform the corresponding diffused light color temperature performance in the diffused light color temperature switching scheme according to a prearranged sequence.

### Claim 85 (depends on 84)

The LED lighting device according to claim 84, wherein when the main power switch is used for generating the short power interruption signal, the main power switch is turned off and turned back on within a predetermined time interval.

### Claim 86 (depends on 84)

The LED lighting device according to claim 84, wherein when the push button or the touch sensor is used, a signal detection circuitry is connected to the push button or the touch sensor, wherein when the push button or the touch sensor is operated, a voltage signal is transmitted to the signal detection circuitry to actuate a momentary power interruption and consequently a short power interruption signal is generated and detected by the power interruption detection circuit, the controller accordingly operates to alternately perform the corresponding diffused light color temperature performance in the diffused light color temperature switching scheme according to a prearranged sequence.

### Claim 87 (depends on 84)

The LED lighting device according to claim 84, wherein the short power interruption signal is generated by a wireless external control signal designed to control a conduction state of a bi-directional semiconductor switching device electrically connected between an AC power source and an LED driver circuitry, wherein the wireless external control signal is received by a wireless signal receiver electrically coupled with a second controller electrically coupled with the bi-directional semiconductor switching device, wherein upon receiving the wireless external control signal the second controller operates to instantly cutoff a conduction of the bi-directional semiconductor switching device and re-conduct the bi-directional semiconductor switching device within a predetermined time interval, wherein the LED driver circuitry comprises an AC/DC power converter and a constant current control circuit to output a constant current to the power loading circuitry.

### Claim 88 (depends on 84)

The LED lighting device according to claim 84, wherein the short power interruption signal is generated by a push button or a touch sensor electrically coupled with a second controller electrically coupled with a bi-directional semiconductor switching device to control a conduction state of the bi-directional semiconductor switching device electrically connected between an AC power source and an LED driver circuitry, wherein when the push button or the touch sensor is operated for a short time interval, a voltage signal with a time length equal to the short time interval is detected by the second controller, wherein upon receiving the voltage signal the second controller operates to instantly cutoff a conduction of the bi-directional semiconductor switching device and re-conduct the bi-directional semiconductor switching device within the short time interval to generate the short power interruption signal, wherein the LED driver circuitry comprises an AC/DC power converter and a constant current control circuit to output a constant current to the power loading circuitry.

### Claim 89 (depends on 83)

The LED lighting device according to claim 83, wherein the first external control device is a voltage divider operated by a user to output a plurality of voltage signals interpretable by the controller for respectively executing the pick and play process for respectively selecting and performing the corresponding diffused light color temperature performance in the diffused light color temperature switching scheme; wherein the voltage divider is configured to output the plurality of voltage signals respectively represented by a voltage value, wherein the controller operates to activate the diffused light color temperature switching scheme to generate a corresponding diffused light color temperature performance in the diffused light color temperature switching scheme according to the voltage value outputted by the voltage divider.

### Claim 90 (depends on 89)

The LED lighting device according to claim 89, wherein the voltage divider is optionally designed with a stepless/free setting switch; wherein the voltage divider is configured to operate with a variable resistor to output a voltage value corresponding to a final parking location of a switching motion at the variable resistor; wherein a full voltage value of the voltage divider corresponding to a full length of the variable resistor is divided into a plurality of different voltage domains for activating the pick and play process, wherein the stepless/free setting switch is allowed to park at any location on the variable resistor to generate a corresponding voltage value to the controller, wherein the controller is designed to operate the pick and play process according to a belonging of a voltage domain with respect to the corresponding voltage value received from the voltage divider for selecting the diffused light color temperature performance corresponding to the voltage domain.

### Claim 91 (depends on 89)

The LED lighting device according to claim 89, wherein the voltage divider is operated with a configuration of a slide switch, a rotary switch, or a pull chain switch, designed with a plurality of switching positions operable by a user for selecting and performing the corresponding diffused light color temperature performance from the diffused light color temperature switching scheme.

### Claim 92 (depends on 83)

The LED lighting device according to claim 83, wherein the first external control device is a wireless remote control device comprising at least one wireless external signal receiver electrically coupled with the controller to receive at least one wireless external control signal and convert the at least one wireless external control signal into the at least one first external control signal interpretable by the controller for activating the pick and play process to select and perform the corresponding diffused light color temperature performance in the diffused light color temperature switching scheme.

### Claim 93 (depends on 83)

The LED lighting device according to claim 83, wherein the first external control device is an active infrared ray sensor for detecting an infrared light reflected from an object and converting the infrared light reflected from the object into the at least one first external control signal interpretable by the controller for executing the pick and play process for selecting and performing the corresponding diffused light color temperature performance from the diffused light color temperature switching scheme.

### Claim 94 (depends on 83)

The LED lighting device according to claim 83, wherein the at least one external control device is a push button or a touch sensor, wherein when the push button or the touch sensor is operated, the controller accordingly operates to activate the pick and play process to alternately perform one of the diffused light color temperature performances in the diffused light color temperature switching scheme according to a prearranged sequence.

### Claim 95 (depends on 83)

The LED lighting device according to claim 83, wherein the at least one external control device is a selection switch electrically connectable to a plurality of switching positions with each switching position being electrically and respectively coupled with a control pin of the controller, wherein when the selection switch is connected to one of the plurality of switching positions, a constant voltage signal is delivered to a corresponding control pin of the controller to activate the diffused light color temperature switching scheme for selecting the corresponding diffused light color temperature performance.

### Claim 96 (depends on 83)

The LED lighting device according to claim 83, wherein the LED lighting device is an LED light bulb, an LED recessed light, an LED ceiling light, an LED pendant light, an LED wall light, an LED under cabinet light, a ceiling fan light kit, a portable LED lamp or any other LED lamp for indoor or outdoor application.

### Claim 97 (depends on 83)

The LED lighting device according to claim 83, wherein the diffused light color temperature performances of the diffused light color temperature switching scheme include a low diffused light color temperature performance, a medium diffused light color temperature performance and a high diffused light color temperature performance; wherein the controller is further designed with a free running process to operate a free running performance of the diffused light color temperature switching scheme, wherein a second external control device is designed to output a second external control signal to activate the free running process, wherein the controller manages to operate the free running process to gradually rotate a running pick and play of the diffused light color temperature switching scheme, wherein the free running process operates to perform the low diffused light color temperature performance first for a predetermined short time interval, and then is switched to perform the medium diffused light color temperature performance for the predetermined short time interval, and then is switched to perform the high diffused light color temperature performance for the predetermined short time interval to complete a free running cycle, the free running cycle continues till the second external control signal is ceased or till the second external control device outputs another second external control signal to end the free running process.

### Claim 98 (depends on 83)

The LED lighting device according to claim 83, wherein the diffused light color temperature performances of the diffused light color temperature switching scheme include a low diffused light color temperature performance, a low-medium diffused light color temperature performance, a medium diffused light color temperature performance, a high-medium diffused light color temperature performance and a high diffused light color temperature performance; wherein the controller is further designed with a free running process to operate a free running performance of the diffused light color temperature switching scheme, wherein a second external control device is designed to output a second external control signal to activate the free running process, wherein the controller manages to operate the free running process to gradually rotate a running pick and play of the diffused light color temperature switching scheme, wherein the free running process operates to perform the low diffused light color temperature performance first for a predetermined short time interval, and then is switched to perform the low-medium diffused light color temperature performance for the predetermined short time interval, and then is switched to perform the medium diffused light color temperature performance for the predetermined short time interval, and then is switched to perform the high-medium diffused light color temperature performance for the predetermined short time interval, and then is switched to perform the high diffused light color temperature performance to complete a free running cycle, the free running cycle continues till the second external control signal is ceased or till the second external control device outputs another second external control signal to end the free running process.

### Claim 99 (depends on 81)

The LED lighting device according to claim 81, wherein the first external control device comprises a selection switch respectively connectable to two switching positions configured in the power loading circuitry including a first switching position electrically connected to the first LED load and a second switching position electrically connected to the second LED load, wherein the power loading circuitry is designed with two power loading options including a first power loading option and a second power loading option, wherein when the selection switch is electrically connected to the first switching position, the first power loading option is activated with the DC power being delivered only to the first LED load, namely the first electric power is equal to the DC power, to generate the diffused light with a low diffused light color temperature, and wherein when the selection switch is electrically connected to the second switching position, the second power loading option is activated with the DC power being delivered only to the second LED load, namely the second electric power is equal to the DC power, to generate the diffused light with a high diffused light color temperature.

### Claim 100 (depends on 81)

The LED lighting device according to claim 81, wherein the LED driver circuitry outputs the DC power with a constant current to the light-emitting unit; wherein the first external control device comprises a selection switch connectable respectively to three switching positions configured in the power loading circuitry including a first switching position electrically connected to only the first LED load, a second switching position electrically connected to both the first LED load and the second LED load, and a third switching position electrically connected to only the second LED load; wherein the power loading circuitry comprises three power loading options including a first power loading option, a second power loading option and a third power loading option; wherein when the selection switch is electrically connected to the first switching position, the first power loading option is activated with the DC power being delivered only to the first LED load, namely the first electric power is equal to the DC power, to generate the diffused light with a low diffused light color temperature; wherein when the selection switch is electrically connected to the second switching position, the second power loading option is activated with the DC power being delivered to both the first LED load and the second LED load to generate the diffused light with a medium diffused light color temperature; wherein when the selection switch is electrically connected to the third switching position, the third power loading option is activated with the DC power being delivered only to the second LED load, namely the second electric power is equal to the DC power, to generate the diffused light with a high diffused light color temperature.

### Claim 101 (depends on 81)

The LED lighting device according to claim 81, wherein the LED driver circuitry outputs the DC power with a constant current to the light-emitting unit; wherein the first external control device comprises a selection switch connectable respectively to five switching positions configured in the power loading circuitry including a first switching position electrically connected to only the first LED load, a second switching position electrically connected to both the first LED load and the second LED load with a second resistor being connected in series with the second LED load, a third switching position electrically connected to both the first LED load and the second LED load, a fourth switching position electrically connected with both the first LED load and the second LED load with a first resistor being connected in series with the first LED load, and a fifth switching position electrically connected to only the second LED load, wherein the power loading circuitry comprises five power loading options including a first power loading option, a second power loading option, a third power loading option, a fourth power loading option and a fifth power loading option; wherein when the selection switch is electrically connected to the first switching position, the first power loading option is activated with the DC power being delivered only to the first LED load with the first electric power being equal to the DC power to generate the diffused light with a low diffused light color temperature; wherein when the selection switch is electrically connected to the second switching position, the second power loading option is activated with the DC power being delivered to both the first LED load and the second LED load with the first electric power delivered to the first LED load being greater than the second electric power delivered to the second LED load to generate the diffused light with a low-medium diffused light color temperature; wherein when the selection switch is electrically connected to the third switching position, the third power loading option is activated with the DC power being distributed to both the first LED load and the second LED load with the first electric power being essentially equal to the second electric power to generate the diffused light with a medium diffused light color temperature; wherein when the selection switch is electrically connected to the fourth switching position, the fourth power loading option is activated with the DC power being distributed between the first LED load and the second LED load with the second electric power delivered to the second LED load being greater than the first electric power delivered to the first LED load to generate the diffused light with a high-medium diffused light color temperature, and when the selection switch is electrically connected to the fifth switching position, the fifth power loading option is activated with the DC power being delivered to only the second LED load with the second electric power being equal to the DC power to generate the diffused light with a high diffused light color temperature.