Systems and methods for controlling the spectral content of LED lighting devices
First Claim
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1. A method for generating illumination from a light source and tuning the spectral output of the light source comprising the steps of:
- providing a light engine comprising at least;
one LED of a first color, one LED of a second color, one LED of a third color and one LED of a fourth color and wherein the light engine also comprises electrical circuitry for selectively driving LEDs constituent of said light engine;
electrically driving said light engine to produce a first illumination;
providing a target color point illumination for the light engine;
measuring the color of said first illumination and comparing it to said target color point; and
adjusting the illumination output of at least one of the first color LED, the second color LED, the third color LED and the fourth color LED by selectively adding a phosphor or other lumiphoric material to the LED such that the color of the resulting illumination output of the light engine matches said target color point illumination.
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Abstract
Systems and methods for improving color accuracy and uniformity in LED illumination systems are disclosed including light engines, switching circuits and methods of adding phosphors or lumiphoric materials 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, rich in melanopic flux and that reduce blue light hazard exposure are also disclosed.
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Citations
20 Claims
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1. A method for generating illumination from a light source and tuning the spectral output of the light source comprising the steps of:
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providing a light engine comprising at least;
one LED of a first color, one LED of a second color, one LED of a third color and one LED of a fourth color and wherein the light engine also comprises electrical circuitry for selectively driving LEDs constituent of said light engine;electrically driving said light engine to produce a first illumination; providing a target color point illumination for the light engine; measuring the color of said first illumination and comparing it to said target color point; and adjusting the illumination output of at least one of the first color LED, the second color LED, the third color LED and the fourth color LED by selectively adding a phosphor or other lumiphoric material to the LED such that the color of the resulting illumination output of the light engine matches said target color point illumination. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. 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 wherein the light engine also comprises electrical circuitry for selectively driving LEDs constituent of said light engine and converting said measured spectral characteristics to a measured chromaticity; comparing said measured chromaticity with a target chromaticity; and selectively adding a phosphor or other lumiphoric material to at least one of the first color LED, the second color LED and the third color LED whereby the resultant respective illumination from one or more of the LEDs to which the phosphor or lumiphoric material has been added is modified such that the chromaticity of the illumination output of the light engine matches or approximates the target chromaticity. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A method for generating illumination that produces white light with adequate melanopic flux, reduced blue light hazard flux and color uniformity and which is capable of being tuned to generate a specific spectral illumination output comprising:
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providing a light engine comprising electrical circuitry for selectively driving light engine LEDs, a first color LED, a second color LED, and a third color LED each configured to receive an input electrical current and generate respective illuminations of the first color, the second color and a third color; electrically driving said light engine to produce a first illumination; providing a target color point illumination for the light engine; measuring the color of said first illumination and comparing it to said target color point; and adjusting the illumination output of at least one of the first color LED, the second color LED and the third color LED by selectively adding a phosphor or other lumiphoric material to the LED such that the color of the resulting illumination output of the light engine matches said target color point illumination. - View Dependent Claims (18, 19, 20)
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Specification