Circadian friendly LED light source
First Claim
Patent Images
1. 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, whereinthe 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.
3 Assignments
0 Petitions
Accused Products
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.
-
Citations
27 Claims
-
1. 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
-
16. 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. - View Dependent Claims (17, 18, 19, 20, 21, 22)
-
-
23. 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. - View Dependent Claims (24)
-
-
25. 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. - View Dependent Claims (26, 27)
-
Specification