Calibration method and apparatus for lighting fixtures using multiple spectrum light sources and light mixing
First Claim
1. A method for operating an optical system having a plurality of light sources and outputting combined light, wherein the plurality of light sources have different spectral outputs relative to an input setting which represents a desired characteristic of the combined light, wherein the optical system includes a color sensor for measuring characteristics of the combined light, the method comprising the steps of:
- (a) receiving a user input which maps color to a predefined coordinate space in at least two colors;
(b) transforming the user input to a set of expected color component values representing expected measurements of the color sensor had the plurality of light sources output light corresponding to the user input in actual operation;
(c) outputting control signals for operating the plurality of light sources based on the set of expected color components;
(d) driving the plurality of light sources based on the control signals; and
(e) adjusting the control signals based on measurements of the spectral outputs received from the color sensor following step (d).
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Abstract
Disclosed examples of optical systems having a plurality of light sources with each source having a different spectral outputs may be calibrated by measuring a spectral characteristic of the combined light with two measurements, e.g., one from a colorimeter and one from a sensor included in the system. Accordingly, one can determine a transform function in response to the two measures that models a feedback response of the optical system for each of a plurality of the inputs that would cause the optical system to generate radiant energy within a predetermined range of a spectrum. In order to calibrate the optical system, the transform function is programmed in the optical system to enable the optical system to transform an input to the optical system to a plurality of unique control signals each for controlling a respective light source of the plurality of light sources.
29 Citations
33 Claims
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1. A method for operating an optical system having a plurality of light sources and outputting combined light, wherein the plurality of light sources have different spectral outputs relative to an input setting which represents a desired characteristic of the combined light, wherein the optical system includes a color sensor for measuring characteristics of the combined light, the method comprising the steps of:
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(a) receiving a user input which maps color to a predefined coordinate space in at least two colors; (b) transforming the user input to a set of expected color component values representing expected measurements of the color sensor had the plurality of light sources output light corresponding to the user input in actual operation; (c) outputting control signals for operating the plurality of light sources based on the set of expected color components; (d) driving the plurality of light sources based on the control signals; and (e) adjusting the control signals based on measurements of the spectral outputs received from the color sensor following step (d). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A system for emitting light, comprising:
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a plurality of light sources for emission of light and for thereby producing visible light to form a combined light at least a portion of which is output from the system; a color sensor configured to measure color components emitted by the plurality of light sources contained within the combined light; and a microcontroller configured to process newly user inputted color parameters and control illumination of the plurality of light sources, wherein the microcontroller, to initially drive the plurality of light sources for the newly inputted color parameters, is configured to implement functions, including functions to; (a) transform the newly inputted color parameters to a set of expected color component values representing expected measurements of the color sensor had the plurality of light sources output light corresponding to the newly inputted color parameters in actual operation; and (b) control the illumination of the plurality of light sources based on the expected set of color component values. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A lighting system, comprising:
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a first solid state light emitting element for emitting electromagnetic energy of a first spectral characteristic; a second solid state light emitting element for emitting electromagnetic energy of a second spectral characteristic different from the first spectral characteristic; a mixing element coupled to receive electromagnetic energy of the first and second spectral characteristics emitted by the first and second solid state light emitting elements, for mixing the received energy to form a combined electromagnetic energy into a region to facilitate a humanly perceptible lighting application for the system; a user interface, for user input of a desired setting for a spectral characteristic of the combined energy output; a sensor for detecting a spectral characteristic of the combined electromagnetic energy; and a control circuit for performing a matrix transform operation on data related to the user input of the desired setting to generate data related to expected spectral characteristic of the combined electromagnetic energy by the sensor and using the expected spectral characteristics of the combined electromagnetic energy to determine respective output settings for the first and second solid state light emitting elements, and for applying the respective output settings to control amounts of electromagnetic energy of the first and second spectral characteristics emitted by the first and second solid state light emitting elements to achieve a spectral characteristic of the combined energy substantially corresponding to the desired setting. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32, 33)
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Specification