Lighting devices and methods for use
View Patent ↗An example device is configured to emit a first light having a first luminous flux and a peak intensity at a first wavelength that is greater than or equal to 400 nanometers (nm) and less than or equal to 480 nm. The first luminous flux is variable and/or the emission of the first light is interrupted one or more times. The device is also configured to emit a second light having a second luminous flux and a peak intensity at a second wavelength that is greater than or equal to 500 nm and less than or equal to 630 nm. The second luminous flux is variable and/or the emission of the second light is interrupted one or more times. The first luminous flux is at a maximum at least during a time at which the second luminous flux is not at a maximum.
1. A method performed by a lighting device, the method comprising:
emitting a first light having a first luminous flux and a first peak intensity at a first wavelength that is greater than or equal to 400 nanometers (nm) and less than or equal to 455 nm, wherein the first luminous flux oscillates at a first frequency; and
emitting a second light having a second luminous flux and a second peak intensity at a second wavelength that is greater than or equal to 455 nm, wherein the second luminous flux (i) oscillates at a second frequency that is equal to the first frequency and (ii) is out of phase with the first luminous flux.
2. The method of claim 1 , wherein the first luminous flux takes a form of a square wave, a sinusoidal wave, a sawtooth wave, or a triangle wave.
3. The method of claim 1 , wherein the second luminous flux takes a form of a square wave, a sinusoidal wave, a sawtooth wave, or a triangle wave.
4. The method of claim 1 , wherein the first luminous flux and the second luminous flux take a form of waveforms having equal respective duty cycles.
5. The method of claim 1 , wherein the first luminous flux and the second luminous flux take a form of waveforms having unequal respective duty cycles.
6. The method of claim 1 , wherein at least 50%, at least 60%, at least 70%, at least 80%, at least 90% or at least 95% of a power spectral density of the second light corresponds to wavelengths within a range of 455 nm to 520 nm.
7. The method of claim 1 , wherein at least 50%, at least 60%, at least 70%, at least 80%, at least 90% or at least 95% of a power spectral density of the second light corresponds to wavelengths within a range of 520 nm to 600 nm.
8. The method of claim 1 , wherein emitting the first light and the second light causes adjustment of a circadian rhythm of a subject.
9. The method of claim 1 , wherein the first wavelength is less than or equal to 440 nm.
10. The method of claim 1 , wherein the first frequency and the second frequency are greater than or equal to 0.03 Hz and less than or equal to 20 Hz.
11. A non-transitory computer readable medium storing instructions that, when executed by a lighting device, cause the lighting device to perform functions comprising:
emitting a first light having a first luminous flux and a first peak intensity at a first wavelength that is greater than or equal to 400 nanometers (nm) and less than or equal to 455 nm, wherein the first luminous flux oscillates at a first frequency; and
emitting a second light having a second luminous flux and a second peak intensity at a second wavelength that is greater than or equal to 455 nm, wherein the second luminous flux (i) oscillates at a second frequency that is equal to the first frequency and (ii) is out of phase with the first luminous flux.
12. The non-transitory computer readable medium of claim 11 , wherein the first luminous flux takes a form of a square wave, a sinusoidal wave, a sawtooth wave, or a triangle wave.
13. The non-transitory computer readable medium of claim 11 , wherein the second luminous flux takes a form of a square wave, a sinusoidal wave, a sawtooth wave, or a triangle wave.
14. The non-transitory computer readable medium of claim 11 , wherein the first luminous flux and the second luminous flux take a form of waveforms having equal respective duty cycles.
15. The non-transitory computer readable medium of claim 11 , wherein the first luminous flux and the second luminous flux take a form of waveforms having unequal respective duty cycles.
16. The non-transitory computer readable medium of claim 11 , wherein at least 50%, at least 60%, at least 70%, at least 80%, at least 90% or at least 95% of a power spectral density of the first light corresponds to wavelengths within a range of 400 nm to 415 nm.
17. The non-transitory computer readable medium of claim 11 , wherein at least 50%, at least 60%, at least 70%, at least 80%, at least 90% or at least 95% of a power spectral density of the first light corresponds to wavelengths within a range of 415 nm to 430 nm.
18. The non-transitory computer readable medium of claim 11 , wherein the first frequency and the second frequency are greater than or equal to 0.03 Hz and less than or equal to 20 Hz.
19. The non-transitory computer readable medium of claim 11 , wherein the first wavelength is less than or equal to 440 nm.
20. A method performed by a lighting device, the method comprising:
emitting a first light having a first luminous flux and a first peak intensity at a first wavelength that is greater than or equal to 400 nanometers (nm) and less than or equal to 440 nm, wherein the first luminous flux oscillates at a first frequency; and
emitting a second light having a second luminous flux and a second peak intensity at a second wavelength that is greater than or equal to 440 nm, wherein the second luminous flux (i) oscillates at a second frequency that is equal to the first frequency and (ii) is out of phase with the first luminous flux.