Patent ID: 6683423
Filing Date: 2004-01-27
Classification: F21W,F21Y,H05B

Abstract:
A lighting apparatus for producing a beam of light having a luminous flux spectrum emulating that of a beam of light produced by a predetermined light source having an incandescent lamp, such light source being free of a filter that modifies the luminous flux spectrum of the light emitted by the lamp, the apparatus being suitable for use as part of a lighting fixture and comprising:a plurality of groups of light-emitting devices, each such group configured to emit light having a distinct luminous flux spectrum; and a controller configurable to supply selected amounts of electrical power to the plurality of groups of light-emitting devices, such that the groups cooperate to produce a composite beam of light having a prescribed luminous flux spectrum that has a normalized mean deviation across the visible spectrum of less than about 30% relative to the luminous flux spectrum of a beam of light produced by the predetermined light source to be emulated.