CIRCADIAN-FRIENDLY LED LIGHT SOURCES

摘要

Methods and apparatus for providing circadian-friendly LED light sources are disclosed. A light source is formed to include a first LED emission (e.g., one or more LEDs emitting a first spectrum) and a second LED emission (e.g., one or more LEDs emitting a second spectrum) wherein the first and second LED emissions are combined in a first ratio and in a second ratio such that while changing from the first ratio to the second ratio the relative circadian stimulation is varied while maintaining a color rendering index above 80.

主权项

1. A method of using a lighting system to emit emitted light having a relatively high illuminance but a relatively low circadian stimulation, said light system having at least one solid-state lighting emitter, and at least a first and second additional light emitters for cooperating with said lighting emitter such that said emitted light is white light, said method comprising:
applying power to said lighting system thereby causing at least said light emitter and said first and second additional light emitters to emit said emitted light having a certain correlated color temperature (CCT), the lighting system being configured to produce an illuminance of about 50 lux to about 5000 lux, and a circadian stimulation no greater than about 50% of a reference circadian stimulation of a reference illuminant configured to produce an illuminance essentially the same as said predetermined illuminance and a CCT the same as said certain CCT.