Systems and methods for controlling the spectral content of LED lighting devices
First Claim
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1. A programmable LED light engine capable of being tuned to generate a specific spectral illumination output comprising:
- a set of static LEDs, comprising one or more LEDs of a first color, configured to receive an input electrical current and generate a illumination said first color;
a set of tuning LEDs, different from the set of static LEDs, comprising an LED of a second color and an LED of a third color configured to receive an electrical current and generate illumination of the second color and the third color;
means for providing electrical input current to said sets of static LEDs and tuning LEDs to produce an illumination output of the light engine; and
means for adjusting the illumination output of said set of tuning LEDs such that the illumination output of the light engine corresponds to a target illumination output and wherein the total current through the tuning set of LEDs equals or approximates the current through the static set of LEDs.
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Abstract
Systems and methods for improving color accuracy and uniformity in LED illumination systems are disclosed including light engines and switching circuits for controlling the addition or subtraction of light from one or more color light sources of the light engines to produce light of a uniform and consistent color. Systems and methods of providing LED light engines and associated illumination spectrums that are both visually appealing and rich in melanopic flux are also disclosed.
177 Citations
22 Claims
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1. A programmable LED light engine capable of being tuned to generate a specific spectral illumination output comprising:
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a set of static LEDs, comprising one or more LEDs of a first color, configured to receive an input electrical current and generate a illumination said first color; a set of tuning LEDs, different from the set of static LEDs, comprising an LED of a second color and an LED of a third color configured to receive an electrical current and generate illumination of the second color and the third color; means for providing electrical input current to said sets of static LEDs and tuning LEDs to produce an illumination output of the light engine; and means for adjusting the illumination output of said set of tuning LEDs such that the illumination output of the light engine corresponds to a target illumination output and wherein the total current through the tuning set of LEDs equals or approximates the current through the static set of LEDs. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for controlling the output spectrum of a light engine comprising the steps of:
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measuring spectral characteristics of an illumination output of a light engine that is electrically driven to illumination wherein the light engine comprises a first color LED, a second color LED, and a third color LED and converting said measured spectral characteristics to a measured chromaticity; comparing said measured chromaticity with a target chromaticity; and selectively electrically driving the second color LED and the third color LED to produce respective illumination from one or both of said second and third color LEDs such that the chromaticity of the illumination output of the light engine matches or approximates the target chromaticity and wherein the light engine comprises a plurality of first color LEDs that are not selectively driven and wherein the total electrical current through the second and third color LEDs is equal to the electrical current through the first color LEDs. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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21. A method for controlling the output spectrum of a light engine comprising the steps of:
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measuring spectral characteristics of an illumination output of a light engine that is electrically driven to illumination wherein the light engine comprises a first color LED, a second color LED, and a third color LED and converting said measured spectral characteristics to a measured chromaticity; comparing said measured chromaticity with a target chromaticity; selectively electrically driving the second color LED and the third color LED to produce respective illumination from one or both of said second and third color LEDs such that the chromaticity of the illumination output of the light engine matches or approximates the target chromaticity; and shunting current such that the total current through the second and third color LEDs is less than the current through the first color LED. - View Dependent Claims (22)
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Specification