Patent ID: 9557214
Date: 2017-01-31
CPC Classifications: G01J,G01R,H05B

Claim:
1. An illumination device, comprising: a plurality of light emitting diode (LED) chains configured to produce illumination for the illumination device; a photodetector configured for detecting the illumination produced by each of the plurality of LED chains; an LED driver and receiver circuit configured for: an interface configured for receiving luminous flux and chromaticity measurements, which are measured by an external calibration tool upon receiving the illumination produced by each of the plurality of LED chains at each of the at least three different drive currents when the LED chains are subjected to the first and second ambient temperatures; and a storage medium configured for storing the photocurrent, forward voltage, luminous flux, and chromaticity measurements obtained for each of the plurality of LED chains within a table of calibration values.