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US 9,410,664 B2Granted
Circadian friendly LED light source
AssigneeSoraa, Inc.
InventorsMichael R. Krames, Aurelien J. F. David
Life of this patent
Estimating the term…
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.
Claims27
A light source comprising:
- at least one first light emitting diode (LED) emission source characterized by a first emission;
- and
- at least one second LED emission source characterized by a second emission, wherein
- the first emission and the second emission are configured to provide a first combined emission and a second combined emission;
- the first combined emission is characterized by a first spectral power distribution (SPD) from 350 to 850 nm and fractions Fv1 and Fc1;
- the second combined emission is characterized by a second SPD from 350 to 850 nm and fractions Fv2 and Fc2;
- Fv1 represents the fraction of power of the first SPD in the wavelength range from 400 nm to 440 nm;
- Fc1 represents the fraction of power of the first SPD in the wavelength range from 440 nm to 500 nm;
- Fv2 represents the fraction of power of the second SPD in the wavelength range from 400 nm to 440 nm;
- Fc2 represents the fraction of power of the second SPD in the wavelength range from 440 nm to 500 nm;
- the first SPD and the second SPD have a color rendering index above 80;
- Fv1 is at least 0.05;
- Fc2 is at least 0.1;
- and
- Fc1 is less than Fc2 by at least 0.02.
12 more elements
A display system comprising:
- a first light emitting diode (LED) emission source characterized by a first emission;
- a display configured to emit a first spectral power distribution (SPD) from 350 to 850 nm characterized by a first fraction Fv1 of power in the range 400 nm to 435 nm, wherein,
- the display system is characterized by a color gamut of at least 70% of National Television System Committee (NTSC) gamut standard;
- the first SPD is substantially white with a correlated color temperature (CCT) in a range from 3000K to 9000K;
- and
- Fv1 is at least 0.05.
3 more elements
A light source comprising:
- a light emitting diode (LED) device configured to emit a primary emission;
- one or more wavelength conversion materials optically coupled to the primary emission;
- wherein a portion of the primary emission is absorbed by the wavelength conversion materials to produce a secondary emission;
- wherein a combination of the primary emission and the secondary emission produces white light characterized by an spectral power distribution (SPD) from 350 to 850 nm having a correlated color temperature (CCT) and a color rendering index (CRI);
- wherein at least 5% of the SPD is in a wavelength range from 400 nm to 435 nm;
- wherein a circadian stimulation of the SPD is less than 80% of a circadian stimulation of a reference illuminant having the same color temperature;
- and
- wherein the white light is characterized by a color rendering index above 80.
5 more elements
A lighting system comprising:
- a light emitting diode (LED device configured to emit a primary emission characterized by a primary spectral power distribution (SPD) from 350 to 850 nm;
- at least one phosphor optically coupled to the primary emission, wherein the at least one phosphor is characterized by saturable absorption within a blue-cyan wavelength region;
- wherein the LED device is configured to be controlled by a power signal configured to dim the primary emission;
- wherein at a first power level the system emits a first SPD characterized by a first fraction fc1 of spectral power in a wavelength range from 440 nm to 500 nm and a first correlated color temperature (CCT);
- wherein at a second power level the system emits a second SPD characterized by a second fraction fc2 of spectral power in a wavelength range from 440 nm to 500 nm and a second CCT;
- and
- wherein the second power level is less than the first power level and the second fraction fc2 is less than 80% of the first fraction fc1.
4 more elements
Dependencies are inferred from the claim text.