Method for controlling the luminous flux spectrum of a lighting fixture
First Claim
1. A method for controlling the luminous flux spectrum of light produced by a lighting fixture of a kind incorporating a plurality of groups of light-emitting devices, each group emitting light having a distinct luminous flux spectrum subject to substantial initial variability, the method comprising:
- calibrating each of the plurality of groups of light-emitting devices by measuring the spectral distribution of light emitted by the group in response to a predetermined electrical power input; and
supplying a prescribed amount of electrical power to the light-emitting devices in each of the plurality of groups of devices, such that the groups of devices cooperate to emit light having a desired composite luminous flux spectrum.
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Abstract
A method is disclosed for controlling a lighting fixture of a kind having individually colored light sources, e.g., LEDs, that emit light having a distinct luminous flux spectrum that varies in its initial spectral composition, that varies with temperature, and that degrades over time. The method controls such fixture so that it projects light having a predetermined desired flux spectrum despite variations in initial spectral characteristics, despite variations in temperature, and despite flux degradations over time.
100 Citations
2 Claims
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1. A method for controlling the luminous flux spectrum of light produced by a lighting fixture of a kind incorporating a plurality of groups of light-emitting devices, each group emitting light having a distinct luminous flux spectrum subject to substantial initial variability, the method comprising:
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calibrating each of the plurality of groups of light-emitting devices by measuring the spectral distribution of light emitted by the group in response to a predetermined electrical power input; and
supplying a prescribed amount of electrical power to the light-emitting devices in each of the plurality of groups of devices, such that the groups of devices cooperate to emit light having a desired composite luminous flux spectrum.
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2-26. -26. (canceled)
Specification