Patent ID: 8013281
Filing Date: 2011-09-06
Classification: G01J,H05B,Y10S

Abstract:
1. An LED-based lighting apparatus, comprising: at least one first LED to generate first radiation having a first spectrum; at least one second LED to generate second radiation having a second spectrum different than the first spectrum; a memory for storing at least one first calibration value and at least one second calibration value, wherein the first calibration value represents a difference between a peak value of the first LED and a reference value established for the first LED, and wherein the second calibration value represents a difference between a peak value of the second LED and a reference value established for the second LED; and at least one controller to receive at least first and second lighting commands, the at least one controller configured to: control the at least one first LED and the at least one second LED using a pulse width modulation technique, the at least first and second lighting commands representing respective duty cycles of pulse width modulation signals used to control the at least one first LED and the at least one second LED, apply the at least one first calibration value to the first lighting command to control the at least one first LED so as to output the first radiation at a first calibrated intensity that substantially corresponds in a predetermined manner to the first lighting command, and apply the at least one second calibration value to the second lighting command to control the at least one second LED so as to output the second radiation at a second calibrated intensity that substantially corresponds in a predetermined manner to the second lighting command.