Patent ID: 8174205
Filing Date: 2012-05-08
Classification: F21K,H05B

Abstract:
1. A lighting device, comprising: at least first and second groups of solid state light emitters, said first group of solid state light emitters including at least one first group solid state light emitter, said second group of solid state light emitters including at least one second group solid state light emitter; at least a first sensor, said first sensor positioned such that when said first group of solid state light emitters and said second group of solid state light emitters are illuminated, said first sensor is exposed to combined light, said combined light comprising at least a portion of light emitted by said first group of solid state light emitters and at least a portion of light emitted by said second group of solid state light emitters, said first sensor sensitive to only a portion of said combined light; and circuitry configured to adjust a current applied to at least a first of said second group of solid state light emitters based on an intensity of said portion of said combined light sensed by said first sensor.