Granted Patent B2

US 8,743,023 · App. 13/803,825 · Granted Jun 3, 2014

Abstract

Claims (43)

1. A lighting apparatus comprising:

a computerized device; and

a plurality of luminaires, each luminaire comprising a controller configured to operate the luminaire and positioned in communication with the computerized device;

wherein each luminaire is selectively operable to emit polychromatic source light, each source light having a dominant source light wavelength within a range from about 390 nanometers to about 750 nanometers;

wherein the plurality of luminaires are arrangeable so as to form an array;

wherein the computerized device is programmable to operate the plurality of luminaires such that at least two of the plurality of luminaires emit source lights with different dominant source light wavelengths, and such that the one or more source lights emitted by the plurality of luminaires combine to form a combined light at a distance from the plurality of luminaires defined as a combining distance;

wherein the computerized device is configurable to vary the dominant source light wavelength of each luminaire with time; and

wherein the plurality of luminaires are configured to be operated to selectively emit light having a spectral power distribution that increases spectral opponency to thereby minimize melatonin suppression.

2. The lighting apparatus of claim 1 wherein each luminaire of the plurality of luminaires comprises a driver circuit and a plurality of light-emitting diodes (LEDs).

3. The lighting apparatus of claim 2 wherein the driver circuit is configured to drive the plurality of LEDs with a ripple current at frequencies greater than about 200 Hz.

4. The lighting apparatus of claim 2 wherein the spectral power distribution of the plurality of luminaires has an associated maximum intensity at each wavelength; wherein the plurality of luminaires are operable to emit about 45% of the maximum intensity at a wavelength of about 440 nm, about 53% of the maximum intensity at a wavelength of about 460 nm, about 75% of the maximum intensity at a wavelength of about 480 nm, about 77% of the maximum intensity at a wavelength of about 560 nm, about 74% of the maximum intensity at a wavelength of about 580 nm, and about 71% of the maximum intensity at a wavelength of about 600 nm.

5. The lighting apparatus of claim 4 wherein the driver circuit is configured to control the intensity of light emitted by the respective luminaire through pulse-width modulation.

6. The lighting apparatus of claim 1 wherein the combined light has a color temperature within the range from about 2,700 K to about 3,500 K.

7. The lighting apparatus of claim 1 further comprising a time-keeping device in communication with the computerized device; wherein the computerized device is configured to alter the spectral power distribution of each luminaire of the plurality of luminaires responsive to a time indicated by the time-keeping device.

8. The lighting apparatus of claim 7 wherein the time-keeping device is an atomic clock.

9. The lighting apparatus of claim 7 wherein the computerized device is configured to operate at least one of the plurality of luminaires to emit light having at least one of increased spectral opponency and decreased spectral opponency responsive to the time indicated by the time-keeping device; wherein increased spectral opponency reduces melatonin suppression; and wherein decreased spectral opponency increases melatonin suppression.

10. The lighting apparatus of claim 1 wherein the computerized device is configured to operate at least one of the plurality of luminaires to emit light having decreased spectral opponency to thereby increase melatonin suppression.

11. The lighting apparatus of claim 1 wherein the combined light is a white light.

12. A lighting apparatus according to claim 1 wherein the combined light comprises a plurality of wavelengths; and wherein the plurality of wavelengths varies with time.

13. A lighting apparatus according to claim 12 wherein the controller operates the plurality of luminaires such that a selected wavelength of light is persistently included in the plurality of wavelengths.

14. A lighting apparatus according to claim 1 wherein a luminaire of the plurality of luminaires is operable to emit a source light comprising two wavelengths; wherein the source light has a color associated therewith; and wherein the color is non-white.

15. A method of operating a lighting system that includes a computerized device and a plurality of luminaires operably coupled to the computerized device being arranged in an array and operable to emit polychromatic source lights having a dominant wavelength within a range from about 390 nanometers to about 750 nanometers, the method comprising the steps of:

operating the plurality of luminaires to each emit a source light having respective first dominant wavelengths, the source lights of the plurality of luminaires combining to form a first combined light; and

operating the plurality of luminaires to each emit a source light having respective second dominant wavelengths, the source lights of the plurality of luminaires combining to form a second combined light;

wherein the first dominant wavelength of the source light for one luminaire of the plurality of luminaires is different from the second dominant wavelength of the source light for that luminaire;

wherein the first dominant wavelength of the source light for one luminaire of the plurality of luminaires may be different from the first dominant wavelength of the source light of another luminaire of the plurality of luminaires;

wherein the combined light has a spectral power distribution configured to increase spectral opponency to thereby reduce melatonin suppression.

16. The method of claim 15 wherein the plurality of luminaires are operated to have a ripple current with a frequency of greater than about 200 Hz.

17. The method of claim 15 wherein the spectral power distribution of the combined light an associated maximum intensity at each wavelength; wherein the combined light has an intensity of not greater than about 45% of the maximum intensity at a wavelength of about 440 nm, an intensity of not greater than about 53% of the maximum intensity at a wavelength of about 460 nm, an intensity of not greater than about 75% of the maximum intensity at a wavelength of about 480 nm, an intensity of not greater than about 77% of the maximum intensity at a wavelength of about 560 nm, an intensity of not greater than about 74% of the maximum intensity at a wavelength of about 580 nm, and an intensity of not greater than about 71% of the maximum intensity at a wavelength of about 600 nm.

18. The method of claim 15 wherein the lighting system further comprises a time-keeping device; and wherein the plurality of luminaires are operated to emit a source light responsive to a time indicated by the time-keeping device.

19. A method of operating a lighting system that includes a computerized device and a plurality of luminaires operably coupled to the computerized device being arranged in an array and operable to emit polychromatic source lights having a dominant wavelength within a range from about 390 nanometers to about 750 nanometers, the method comprising the steps of:

determining a lighting scenario, wherein the lightning scenario comprises a plurality of pixels arranged into an array, each pixel corresponding to one of the luminaires of the plurality of luminaires, and each pixel having a pixel light having a dominant wavelength;

determining a selected combined light;

assigning the dominant wavelength of each pixel to the corresponding luminaire, defining a pixel light for each luminaire;

determining whether a metamer comprising the dominant wavelengths of each of the luminaires produces the selected combined light;

wherein the determination that the metamer produces the selected combined light results in the step of operating the plurality of luminaires according to their respective pixel lights; and

wherein the determination that the metamer does not produce the selected combined light results in the steps of:

determining a first subordinate light that combines with the metamer to produce the selected combined light;

identifying a pixel light of one of the pixels that can be adjusted to include the first subordinate light;

determining a first modified pixel light for the identified pixel that will produce both the dominant wavelength of the pixel light of the identified pixel and the first subordinate light; and

operating the plurality of pixels according to their respective pixel light or the first modified pixel light;

wherein the metamer has a spectral power distribution configured to increase spectral opponency to thereby reduce melatonin suppression.

20. The method of claim 19 wherein the plurality of luminaires are operated to have a ripple current with a frequency of greater than about 200 Hz; and wherein the spectral power distribution of the metamer an associated maximum intensity at each wavelength; wherein the combined light has an intensity of not greater than about 45% of the maximum intensity at a wavelength of about 440 nm, an intensity of not greater than about 53% of the maximum intensity at a wavelength of about 460 nm, an intensity of not greater than about 75% of the maximum intensity at a wavelength of about 480 nm, an intensity of not greater than about 77% of the maximum intensity at a wavelength of about 560 nm, an intensity of not greater than about 74% of the maximum intensity at a wavelength of not greater than about 580 nm, and an intensity of not greater than about 71% of the maximum intensity at a wavelength of about 600 nm.

Assignments (10)