Light engine calibration systems and methods
Embodiments of the present disclosure generally relate to systems and methods for calibrating light-emitting diode (LED) light engines. The systems and methods described herein include characterizing the performance of a red-green-blue (RGB) LED light engine so as to enable the display of calibrated, dimensionless output values that accurately reflect a perceived brightness of illumination generated by the light engine for a specific output color.
1. A method of producing calibrated illumination light with a light engine of an illumination system, comprising:
obtaining a first set of data for the light engine, wherein the first set of data includes measured output flux data of the light engine and color sensor luminance readings, wherein the measured output flux data and the color sensor luminance readings correspond to drive intensity data of a light engine input parameter;
determining a first mapping between the measured output flux data and the drive intensity data;
determining a second mapping between the measured output flux data and the color sensor luminance readings;
determining a third mapping between the drive intensity data and the color sensor luminance readings, based on the first mapping and the second mapping;
determining, based on the third mapping, a fourth mapping between a plurality of dimensionless output setting values of the illumination system and the drive intensity data;
receiving one of the plurality of dimensionless output setting values from a user input;
matching the one of the plurality of dimensionless output setting values to a corresponding drive intensity of the light engine input parameter using the fourth mapping; and
producing, using the light engine, illumination light with a desired output flux.
2. The method of claim 1 , wherein the first mapping corresponds to a polynomial fit between the measured output flux data and the drive intensity data.
3. The method of claim 1 , wherein the second mapping corresponds to a polynomial fit between the measured output flux data and the color sensor luminance reading.
4. The method of claim 1 , wherein the third mapping corresponds to a polynomial fit between the drive intensity data and the color sensor luminance readings.
5. The method of claim 1 , wherein the fourth mapping corresponds to a polynomial fit between the plurality of dimensionless output setting values and the drive intensity data.
6. The method of claim 1 , wherein the first mapping is used to estimate a maximum output flux of the light engine.
7. The method of claim 6 , wherein the maximum output flux of the light engine is used to determine a full range of target output flux values, each target output flux value corresponding to one of the plurality of dimensionless output setting values.
8. The method of claim 7 , wherein the second mapping is used to determine adjusted color sensor luminance readings, each of the adjusted color sensor luminance readings corresponding to one of the full range of target output flux values.
9. The method of claim 8 , wherein the third mapping is used to determine an adjusted drive intensity corresponding to each of the adjusted color sensor luminance readings.
10. The method of claim 9 , wherein the adjusted drive intensities are scaled to correspond to the full range of target output flux values.
11. The method of claim 1 , wherein determining the second mapping between the measured output flux data and the color sensor luminance readings is independent of a color of light produced by the light engine.
12. The method of claim 11 , wherein determining the first, third, and fourth mappings is dependent upon a color of light produced by the light engine.