Circadian-friendly LED light sources

Patent metadata

Field	Value
Publication number	US-12508395-B2
Application number	US-202217994999-A
Country	US
Kind code	B2
Filing date	Nov 28, 2022
Priority date	Aug 29, 2013
Publication date	Dec 30, 2025
Grant date	Dec 30, 2025

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 method of using a lighting system to emit emitted light in a first and second mode, said first mode, said first mode having a relatively low circadian stimulation, and said second mode having a relatively high circadian stimulation, said method comprising:
applying power according to said first mode in which power is applied to a first lighting system thereby emitting a first mode emitted light having a first correlated color temperature (CCT), the lighting system being configured to produce an illuminance of about 50 lux to about 5000 lux, and a first 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; applying power according to said second mode in which power is applied to a second lighting system thereby emitting a second mode emitted light having a second correlated color temperature (CCT), the lighting system being configured to produce an illuminance of about 50 lux to about 5000 lux, and a second circadian stimulation being at least 100% of said reference circadian stimulation.

2 . The method of claim 1 , wherein said first and second CCTs are about the same.

3 . The method of claim 1 , wherein said first and second illuminances are about the same.

4 . The method of claim 1 , wherein said first light emitting circuit comprises at least one light-emitting diode or one laser diode emitting having a peak wavelength in a range 380-440 nm, said second light emitting circuit has an emission spectrum having a peak between 500 nm and 550 nm.

5 . The method of claim 1 , wherein said first light emitting circuit does not emit light with a peak wavelength greater than 440nm and less than 500 nm.

6 . The method of claim 1 , wherein said first light emitting circuit has an SPD in a spectral region between 440 nm and 480 nm and a power in the SPD between 440 nm and 480 nm is less than 2% of a power of the SPD between 380 nm and 780 nm.

7 . The method of claim 1 , wherein said first and second emitted lights each has a CRI Ra higher than 80 and a CRI R9 higher than 0.

8 . The method of claim 1 , wherein said first and second emitted lights each has a CRI R9 higher than 80.

9 . The method of claim 1 , wherein said certain first and second CCTs are at least 2700K, and said first and second emitted lights having a Duv +/−0.01 from the Planckian locus.

10 . The method of claim 1 , wherein the illuminance is a retinal illuminance.

Assignees

• Korrus Inc

Inventors

• Krames Michael R
• David Aurelien J F
• Radkov Emil
• Smitt Willem

Classifications

• F21W2102/00

  Exterior vehicle lighting devices for illuminating purposes · CPC title

• H05B47/16

  by timing means · CPC title

• H05B45/20

  Controlling the colour of the light · CPC title

• F21W2107/10

  for land vehicles · CPC title

• F21K9/238

  Arrangement or mounting of circuit elements integrated in the light source · CPC title