Integrating chamber LED lighting with pulse amplitude modulation to set color and/or intensity of output

摘要: An exemplary system to provide visible lighting of a selectable spectral characteristic (e.g. color combination light) uses an optical integrating cavity or other diffuse mixing element combine light different colors from LEDs. Amplitude modulation pulsed operation the sources, e.g. pulse amplitude added baseline forward bias current for each LEDs, controls amount supplied and thus included in combined output system. A sensor may feedback as light, closed-loop control one more modulations. Examples are also disclosed that utilize phosphor doping system's reflective elements, add desired wavelengths output.