# US 2020/0404757 A1 · System and Method for Matching Light Output from LED Luminaires

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- Number: US 2020/0404757 A1
- Document ID: US20200404757A1
- Status: Published application
- Kind: A1
- Application number: 17/011,546
- Filed: 2020-09-03
- Published: 2020-12-24
- Earliest claimed: 2019-09-03
- Assignees: Robe Lighting s.r.o.
- Applicants: Robe Lighting s.r.o.
- Inventors: Jindrich Vavrik; Josef Valchar
- Web page: https://patentgrep.com/patent/US20200404757A1

## CPC

- H05B 45/12: using optical feedback
- F21V 23/003: {the elements being electronics drivers or controllers for operating the light source, e.g. for a LED array}
- H05B 45/22: using optical feedback
- H05B 47/165: following a pre-assigned programmed sequence; Logic control [LC]
- F21Y 2115/10: Light-emitting diodes [LED]
- H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- F21V: FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- 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

## Abstract

A luminaire has a light-emitting diode (LED) light source, a light sensor, and a control system. The control system receives a Measure command measure the current intensity of the LED light source. The control system measures the intensity using the light sensor, stores current intensity data in non-volatile memory, obtains the LED light source's previous intensity, selects an indicator color representing how much the current intensity is reduced from the previous intensity, and causes the luminaire to emit a light beam having the indicator color. The control system also receives an Adjust command to reduce the LED light source to a total intensity reduction amount. The control system obtains the LED light source's current reduction amount, determines whether the total intensity reduction amount is more than the current reduction amount, and, if so, causes the LED light source to emit a reduced intensity light beam.

## Claims

### Claim 1

A luminaire, comprising:
a light-emitting diode (LED) light source configured to emit a light beam;
a light sensor, optically coupled to the LED light source and configured to measure a current intensity of a light beam emitted by the LED light source and produce an intensity signal based on the measured intensity; and
a control system electrically coupled to the LED light source, to a non-volatile memory, and to the light sensor, the control system configured to:
receive a Measure command via a data link, the Measure command instructing the luminaire to measure the current intensity of the light beam emitted by the LED light source and, in response to receiving the Measure command, to:
obtain the intensity signal from the light sensor;
store in the non-volatile memory current intensity data representing the intensity signal;
obtain previous intensity data that represents a previously measured intensity of the light beam emitted by the LED light source;
select an indicator color to represent an amount by which the current intensity data is less than the previous intensity data; and
cause the luminaire to emit a beam of light having the indicator color; and
receive an Adjust command via the data link, the Adjust command comprising total reduction data representing a total reduction amount for intensity of a reduced intensity light beam emitted by the LED light source and, in response to the Adjust command, to:
obtain a current reduction amount representing an amount by which the current intensity data is less than the previous intensity data;
determine whether the total reduction amount is greater than the current reduction amount; and
cause the LED light source to emit a reduced intensity light beam having a reduced intensity when the total reduction amount is greater than the current reduction amount.

### Claim 2 (depends on 1)

The luminaire of claim 1, wherein the control system is configured to control a color changing system to cause the luminaire to emit the beam of light having the indicator color.

### Claim 3 (depends on 1)

The luminaire of claim 1, wherein:
the LED light source comprises a plurality of LED emitters; and
the control system is configured to control individual brightness of at least some LED emitters of the plurality of LED emitters to cause the luminaire to emit the beam of light having the indicator color.

### Claim 4 (depends on 1)

The luminaire of claim 1, wherein the control system is configured, in further response to the Measure command, to cause the LED light source to emit a reduced intensity light beam having a reduced intensity when a previously received total reduction amount is greater than the current reduction amount.

### Claim 5 (depends on 1)

The luminaire of claim 1, wherein:
the LED light source comprises the non-volatile memory; and
the control system is configured to:
store the current intensity data in the non-volatile memory of the LED light source; and
obtain the previous intensity data from the non-volatile memory of the LED light source.

### Claim 6 (depends on 1)

The luminaire of claim 1, wherein:
the control system is configured to, after causing the LED light source to emit the reduced intensity light beam:
obtain a second intensity signal from the light sensor;
obtain reduced current intensity data representing the second intensity signal;
select a second indicator color to represent an amount by which the reduced current intensity data is less than the previous intensity data; and
cause the luminaire to emit a beam of light having the second indicator color.

### Claim 7 (depends on 1)

The luminaire of claim 1, wherein the control system is configured to move the light sensor into and out of the light beam emitted by the LED light source.

### Claim 8 (depends on 1)

The luminaire of claim 1, wherein the control system is configured, in further response to the Adjust command, to:
calculate an additional reduction amount by which the total reduction amount is greater than the current reduction amount; and
cause the LED light source to emit the reduced intensity light beam by causing the LED light source to reduce an intensity of its emitted light beam by the additional reduction amount.

### Claim 9 (depends on 8)

The luminaire of claim 8, wherein the control system is configured, in further response to the Adjust command, to:
store the additional reduction amount in the non-volatile memory; and
cause the LED light source to reduce the intensity of its emitted light beam by the additional reduction amount when the luminaire is powered up from a powered-off state.

### Claim 10 (depends on 9)

The luminaire of claim 9, wherein the Adjust command comprises Clear Flag data and the control system is configured to, in response to the Clear Flag data:
clear the additional reduction amount stored in the non-volatile memory; and
cause the LED light source to emit the light beam at full intensity and to emit the light beam at full intensity when the luminaire is powered up from a powered-off state.

### Claim 11 (depends on 9)

The luminaire of claim 9, wherein the LED light source comprises non-volatile memory; and the control system is configured to store the additional reduction amount in the non-volatile memory of the LED light source.

### Claim 12

A luminaire, comprising:
a light-emitting diode (LED) light source configured to emit a light beam;
a light sensor, optically coupled to the LED light source and configured to measure a current intensity of the light beam and produce an intensity signal based on the measured intensity; and
a control system electrically coupled to the LED light source, to a non-volatile memory, and to the light sensor, the control system configured to:
obtain the intensity signal from the light sensor;
store in the non-volatile memory current intensity data representing the intensity signal;
obtain previous intensity data that represents a previously measured intensity of the light beam emitted by the LED light source;
select an indicator color to represent an amount by which the current intensity data is less than the previous intensity data; and
cause the luminaire to emit a beam of light having the indicator color.

### Claim 13 (depends on 12)

The luminaire of claim 12, wherein the control system is configured to move the light sensor into and out of the light beam emitted by the LED light source.

### Claim 14 (depends on 12)

The luminaire of claim 12, wherein the control system is configured to cause the luminaire to emit the beam of light having the indicator color in a preset direction.

### Claim 15 (depends on 12)

The luminaire of claim 12, wherein the control system is configured to control a color changing system to cause the luminaire to emit the beam of light having the indicator color.

### Claim 16 (depends on 12)

The luminaire of claim 12, wherein:
the LED light source comprises a plurality of LED emitters; and
the control system is configured to control individual brightness of at least some LED emitters of the plurality of LED emitters to cause the luminaire to emit the beam of light having the indicator color.

### Claim 17 (depends on 12)

The luminaire of claim 12, wherein:
the LED light source comprises the non-volatile memory; and
the control system is configured to:
store the current intensity data in the non-volatile memory of the LED light source; and
obtain the previous intensity data from the non-volatile memory of the LED light source.

### Claim 18

A luminaire, comprising:
a light-emitting diode (LED) light source configured to emit a light beam; and
a control system electrically coupled to the LED light source, the control system configured to receive an Adjust command via a data link, the Adjust command comprising total reduction data representing a total reduction amount for intensity of a reduced intensity light beam emitted by the LED light source and, in response to the Adjust command:
obtain a current reduction amount representing a current amount by which a current intensity of a full intensity light beam emitted by the LED light source is less than a previously measured intensity of the full intensity light beam emitted by the LED light source;
determine whether the total reduction amount is greater than the current reduction amount; and
cause the LED light source to emit a reduced intensity light beam having a reduced intensity when the total reduction amount is greater than the current reduction amount.

### Claim 19 (depends on 18)

The luminaire of claim 18, wherein the control system is coupled to non-volatile memory and configured to obtain the current reduction amount by reading the current reduction amount from the non-volatile memory.

### Claim 20 (depends on 18)

The luminaire of claim 18, further comprising:
a light sensor, optically coupled to the LED light source and configured to measure the current intensity of the light beam emitted by the LED light source and produce an intensity signal based on the measured intensity,
wherein the control system is configured, after causing the LED light source to emit the reduced intensity light beam, to:
obtain a reduced intensity signal from the light sensor;
obtain current reduced intensity data representing the reduced intensity signal;
select an indicator color to represent an amount by which the current reduced intensity data is less than the previously measured intensity of the full intensity light beam emitted by the LED light source; and
cause the luminaire to emit a beam of light having the indicator color.

### Claim 21 (depends on 18)

The luminaire of claim 18, wherein the LED light source comprises non-volatile memory, the Adjust command comprises a Clear Flag data, and the control system is configured to:
in further response to the Adjust command:
calculate an additional reduction amount by which the total reduction amount is greater than the current reduction amount;
cause the LED light source to emit the reduced intensity light beam by causing the LED light source to reduce an intensity of its emitted light beam by the additional reduction amount;
store the additional reduction amount in the non-volatile memory of the LED light source; and
cause the LED light source to reduce the intensity of its emitted light beam by the additional reduction amount when the luminaire is powered up from a powered-off state; and
in response to the Clear Flag data:
clear the additional reduction amount stored in the non-volatile memory of the LED light source; and
cause the LED light source to emit the light beam at full intensity and to emit the light beam at full intensity when the luminaire is powered up from a powered-off state.