Circadian-friendly LED light source

Patent metadata

Field	Value
Publication number	US-10137277-B2
Application number	US-201816031121-A
Country	US
Kind code	B2
Filing date	Jul 10, 2018
Priority date	Aug 29, 2013
Publication date	Nov 27, 2018
Grant date	Nov 27, 2018

Abstract

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.

First claim

What is claimed is:

1. A light emitter comprising:
one or more LEDs configured to emit LED light, said one or more LEDs comprising at least a violet pump LED configured to emit a pump light with a peak wavelength around 405 nm;
at least one phosphor configured to emit converted light by converting a fraction of said pump light; and
wherein said light emitter emits an emitted light formed by a combination of a fraction of said LED light and said converted light, said emitted light having a spectral power distribution (SPD), said SPD has a first power from 350 nm to 850 nm and a second power from 400 nm to about 440 nm, wherein said second power is at least 25% of said first power, and wherein said SPD has a CRI greater than 80 and an R9 greater than 0.

2. The light emitter of claim 1 , wherein said one or more LEDs comprises at least one blue LED.

3. The light emitter of claim 1 , further comprising a blue emitter.

4. The light emitter of claim 3 , wherein said blue emitter is a blue LED.

5. The light emitter of claim 3 , wherein said blue emitter is a phosphor.

6. The light emitter of claim 1 , wherein said R9 is at least 50.

7. The light emitter of claim 1 , wherein said emitted light has a chromaticity within +/−five Du′v′ points of the Planckian locus.

8. The light emitter of claim 1 , wherein said emitted light has a chromaticity below the Planckian locus.

9. The light emitter of claim 1 , wherein said SPD has a CCT ranging from about 3000K to about 9000K.

10. The light emitter of claim 1 , wherein said SPD has a local peak corresponding to leaked pump light.

11. The light emitter of claim 10 , wherein said first LED light comprises at least a fraction of said violet light and said second LED light comprises at least a fraction of said second light.

12. The light emitter of claim 10 , wherein said second emitted light has a second SPD, said second SPD has a third power from 440 nm to 500 nm and a fourth power from 400 nm to about 440 nm, wherein said third power is less than 10% of said fourth power.

13. The light emitter of claim 10 , configured to switch between said first emitted light and said second emitted light based on at least one of the following inputs: time, date, user command.

14. The light emitter of claim 10 , wherein said R9 is at least 50.

15. The light emitter of claim 10 , wherein said first emitted light has a chromaticity within +/−five Du′v′ points of the Planckian locus.

16. The light emitter of claim 10 , wherein said first emitted light has a chromaticity below the Planckian locus.

17. The light emitter of claim 10 , wherein said first SPD has a CCT ranging from about 3000K to about 9000K.

18. The light emitter of claim 1 , wherein said at least one phosphor comprises two or more phosphors.

19. A light emitter for emitting at least a first and second emitted light, said light emitter comprising:
one or more LEDs configured to emit LED light, said one or more LEDs comprising at least a violet LED configured to emit a violet light with a peak wavelength around 405 nm and a second LED configured to emit a second light, wherein said one or more LEDs are configured to emit at least a first LED light and a second LED light by varying the amount of said at least one violet LED and said at least one second LED in said LED light;
at least one phosphor configured to emit converted light by converting a fraction of said LED light,
wherein said emitted light comprises at least a first emitted light comprising at least a portion of said first LED light and said converted light, or a second emitted light comprising at least a portion of said second LED light, and wherein said first emitted light has a first spectral power distribution (SPD), said first SPD has a first power from 350 nm to 850 nm and a second power from 400 nm to about 440 nm, wherein said second power is at least 25% of said first power, and wherein said SPD has a CRI greater than 80 and an R9 greater than 0.

20. The light emitter of claim 19 , wherein said second LED is a blue LED.

21. The light emitter of claim 19 , wherein said second LED is a violet LED.

22. The light emitter off claim 19 , where said second LED light is substantially all said second light.

Assignees

• Soraa Inc

Inventors

• Krames Michael R
• David Aurielen J F

Classifications

• H05B47/16

  by timing means · CPC title

• H05B47/105

  in response to determined parameters · CPC title

• F21Y2105/10

  comprising a two-dimensional [2D] array of point-like light-generating elements · CPC title

• F21S4/20

  with light sources held by or within elongate supports · CPC title

• F21V9/08

  for producing coloured light, e.g. monochromatic; for reducing intensity of light (with provision for controlling the colour F21V9/40) · CPC title