# US 2014/0197759 A1 · Lighting Control System and Method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0197759 A1 - Document ID: US20140197759A1 - Status: Published application - Kind: A1 - Application number: 14/211,830 - Filed: 2014-03-14 - Published: 2014-07-17 - Earliest claimed: 2012-05-14 - Assignees: Usai, LLC - Inventors: Donald L. Wray - Web page: https://patentgrep.com/patent/US20140197759A1 ## CPC - H05B 45/10: Controlling the intensity of the light - H05B 45/40: Details of LED load circuits - H05B 45/3577: Emulating the dimming characteristics, brightness or colour temperature of incandescent lamps - H05B 45/37: Converter circuits - H05B 45/395: Linear regulators - H05B 45/325: Pulse-width modulation [PWM] - H05B 45/46: having LEDs disposed in parallel lines - Y02B 20/30: Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED] - H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL - Y02B: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS ## Abstract A lighting system has first and second light sources operable to generate light having cool and warm white color temperatures, respectively. A color control provides a variable color control signal to adjust a perceived color output of the lighting system. Throughout a range of the color control signal, the controller is operable to smoothly vary the perceived color output of the lighting system between the cool white color and the warm white color. In second and thirds ranges of the color control signal, the perceived color output of the lighting system is the cool or warm white color, respectively. ## Claims ### Claim 1 A lighting system, comprising: first and second light sources each comprising a light emitting diode; the first light source being operable to generate light having a cool white color temperature greater than or equal to 2800 degrees Kelvin; the second light source being operable to generate light having a warm white color temperature less than or equal to 2200 degrees Kelvin; a color control providing a variable color control signal to adjust a perceived color output of the lighting system; a controller coupled to the color control to receive the color control signal, and coupled to the first and second light sources; the color control signal having a first range defined by first and second states; at the first state of the color control signal, the perceived color output of the lighting system being the cool white color, and at the second state of the color control signal, the perceived color output of the lighting system being the warm white color; and throughout the first range of the color control signal, the controller being operable to adjust outputs of the first and second light sources, as a function of the color control signal, continuously and in an opposite manner, to smoothly vary the perceived color output of the lighting system between the cool white color and the warm white color. ### Claim 2 (depends on 1) The lighting system of claim 1, comprising: throughout a second range of the color control signal different than the first range, the perceived color output of the lighting system being the cool white color; and throughout a third range of the color control signal different than the first and second ranges, the perceived color output of the light system being the warm white color. ### Claim 3 (depends on 1) The lighting system of claim 1, comprising: a brightness control operable to control a brightness level of the lighting system independent of the color control; and the color control does not appreciably change the brightness level of the lighting system. ### Claim 4 (depends on 1) The lighting system of claim 1, comprising: the lighting system being operable to provide a variable aggregate current driving the first and second light sources; and the color control signal being derived from the variable aggregate current. ### Claim 5 (depends on 1) The lighting system of claim 1, comprising: throughout the first range of the color control signal the color output of the lighting system substantially following the Black Body Locus. ### Claim 6 (depends on 1) The lighting system of claim 1, comprising: the controller being operable, in response to a change in the color control signal at a first rate, to change the perceived color output of the lighting system at a second rate slower than the first rate. ### Claim 7 (depends on 1) The lighting system of claim 1, comprising the color control providing a variable voltage color control signal. ### Claim 8 A recessed lighting fixture, comprising: first and second light sources each comprising a light emitting diode; the first light source being operable to generate light having a cool white color temperature greater than or equal to 2700 degrees Kelvin; the second light source being operable to generate light having a warm white color temperature less than or equal to 2700 degrees Kelvin, and between about 500 and 4000 degrees Kelvin less than the cool white color; a controller coupled to the first and second light sources; the controller being operable to receive a color control signal from a color control providing a variable color control signal; throughout a first range of the color control signal, the controller being operable to adjust outputs of the first and second light sources, as a function of the color control signal, continuously and in an opposite manner, to smoothly vary the perceived color output of the recessed lighting fixture between the cool white color and the warm white color. ### Claim 9 (depends on 8) The recessed lighting fixture of claim 8, comprising: throughout a second range of the color control signal different than the first range, the perceived color output of the recessed lighting fixture being the cool white color; and throughout a third range of the color control signal different than the first and second ranges, the perceived color output of the recessed light fixture being the warm white color. ### Claim 10 (depends on 8) The recessed lighting fixture of claim 8, comprising: a brightness control operable to control a brightness level of the lighting system independent of the color control; and the color control does not appreciably change the brightness level of the lighting system. ### Claim 11 (depends on 8) The recessed lighting fixture of claim 8, comprising: the lighting system being operable to provide a variable aggregate current driving the first and second light sources; and the color control signal being derived from the variable aggregate current. ### Claim 12 (depends on 8) The recessed lighting fixture of claim 8, comprising: throughout the first range of the color control signal the color output of the lighting system substantially following the Black Body Locus. ### Claim 13 (depends on 8) The recessed lighting fixture of claim 8, comprising: the controller being operable, in response to a change in the color control signal at a first rate, to change the perceived color output of the lighting system at a second rate slower than the first rate. ### Claim 14 (depends on 8) The recessed lighting fixture of claim 8, comprising: the color control providing a variable voltage color control signal. ### Claim 15 A lighting system, comprising: first and second light sources each comprising a light emitting diode; the first light source being operable to generate light having a cool white color temperature greater than or equal to 2700 degrees Kelvin; the second light source being operable to generate light having a warm white color temperature less than or equal to 2200 degrees Kelvin; a color control comprising a dimmer providing a variable color control signal to adjust a perceived color output of the lighting system; a controller coupled to the color control to receive the color control signal, and coupled to the first and second light sources; and throughout a first range of the color control signal, the controller being operable to adjust outputs of the first and second light sources in a continuous manner, as a function of the color control signal, to smoothly vary the perceived color output of the lighting system between the cool white color and the warm white color. ### Claim 16 (depends on 15) The lighting system fixture of claim 15, comprising: throughout a second range of the color control signal different than the first range, the perceived color output of the lighting system being the cool white color; and throughout a third range of the color control signal different than the first and second ranges, the perceived color output of the light system being the warm white color. ### Claim 17 (depends on 15) The lighting system fixture of claim 15, comprising: a brightness control operable to control a brightness level of the lighting system independent of the color control; and the color control does not appreciably change the brightness level of the lighting system. ### Claim 18 (depends on 15) The lighting system fixture of claim 15, comprising: the lighting system being operable to provide a variable aggregate current driving the first and second light sources; and the color control signal being derived from the variable aggregate current. ### Claim 19 (depends on 15) The lighting system fixture of claim 15, comprising: throughout the first range of the color control signal the color output of the lighting system substantially following the Black Body Locus. ### Claim 20 (depends on 15) The lighting system of claim 15, comprising: the controller being operable, in response to a change in the color control signal at a first rate, to change the perceived color output of the lighting system at a second rate slower than the first rate. ### Claim 21 (depends on 16) The lighting system of claim 16, comprising: the first light source being operable to generate light having a color temperature greater than or equal to 2800. ### Claim 22 A lighting system, comprising: first and second light sources each comprising a light emitting diode; the first light source being operable to generate light of a first color; the second light source being operable to generate light of a second color, different than the first color; a color control operable to generate a variable voltage color control signal to adjust a perceived color output of the lighting system; a controller coupled to the color control to receive the color control signal, and coupled to the first and second light sources; the color control signal having a first range defined by first and second states; at the first state of the color control signal, the perceived color output of the lighting system being the first color, and at the second state of the color control signal, the perceived color output of the lighting system being the second color; and throughout the first range of the color control signal, the controller being operable to adjust outputs of the first and second light sources in a continuous manner, as a function of the color control signal, to smoothly vary the perceived color output of the lighting system between the first color and the second color. ### Claim 23 (depends on 22) The lighting system of claim 22, comprising: the first light source having a color temperature greater than or equal to 2700 degrees Kelvin; and the second light source having a color temperature less than or equal to 2700 degrees Kelvin, and between about 500 and 4000 degrees Kelvin less than the color temperature of the first light source. ### Claim 24 (depends on 22) The lighting system of claim 22, comprising: the first light source having a color temperature greater than or equal to 2800 degrees Kelvin; and the second light source having a color temperature less than or equal to 2200 degrees Kelvin. ### Claim 25 (depends on 22) The lighting system of claim 22, comprising: throughout a second range of the color control signal different than the first range, the perceived color output of the lighting system being the first color; and throughout a third range of the color control signal different than the first and second ranges, the perceived color output of the light system being the second color. ### Claim 26 (depends on 22) The lighting system of claim 22, comprising: a brightness control operable to control a brightness level of the lighting system independent of the color control; and the color control does not appreciably change the brightness level of the lighting system. ### Claim 27 (depends on 22) The lighting system of claim 22, comprising: the lighting system being operable to provide a variable aggregate current driving the first and second light sources; and the color control signal being derived from the variable aggregate current. ### Claim 28 (depends on 22) The lighting system of claim 22, comprising: throughout the first range of the color control signal the color output of the lighting system substantially following the Black Body Locus. ### Claim 29 (depends on 22) The lighting system as in claim 22, comprising: the color control providing a color control signal varying from about 0 volts to about 10 volts. ### Claim 30 (depends on 22) The lighting system of claim 22, comprising: the controller being operable, in response to a change in the color control signal at a first rate, to change the perceived color output of the lighting system at a second rate slower than the first rate.