| abstract |
The invention discloses a physiological rhythm-friendly LED light source. Additionally, the present invention discloses methods and apparatus for providing circadian friendly LED light sources. A light source is formed to include a first LED emission (eg, one or more LEDs emitting a first spectrum) and a second LED emission (eg, one or more LEDs emitting a second spectrum), wherein the first and the second LED emission are combined at the first ratio and the second ratio such that the relative circadian stimulus is changed while maintaining the color rendering index above 80 while changing from the first ratio to the second ratio. |