LED lighting system

• US 8,436,556 B2
• Filed: 10/07/2010
• Issued: 05/07/2013
• Est. Priority Date: 10/08/2009
• Status: Active Grant

• Current Assignee: Delos Living LLC
• Original Assignee: Delos Living LLC
• Inventors: Eisele, Eric Jon, Fontecchio, Adam K., Sheldon, Donald
• Primary Examiner(s): Le, Tung X
• Application Number:
  US12/900,158
• Publication Number:
  US 20110084614A1
• Time in Patent Office: 943 Days
• Field of Search: 315/149, 315/152, 315/158, 315/291, 315/294, 315/297, 315/307, 315/312, 345/600, 345/690
• US Class Current: 315/307
• CPC Class Codes: H05B 45/00 Circuit arrangements for operating light-emitting diodes [LED]
• CPC Class Codes: H05B 45/20 Controlling the colour of the light
• CPC Class Codes: H05B 45/22 using optical feedback
• CPC Class Codes: H05B 45/46 having LEDs disposed in parallel lines
• CPC Class Codes: H05B 45/48 having LEDs organised in strings and incorporating parallel shunting devices
• CPC Class Codes: H05B 47/10 Controlling the light source
• CPC Class Codes: H05B 47/105 in response to determined parameters
• CPC Class Codes: H05B 47/11 by determining the brightness or colour temperature of ambient light
• CPC Class Codes: H05B 47/155 Coordinated control of two or more light sources
• CPC Class Codes: Y02B 20/40 Control techniques providing energy savings, e.g. smart controller or presence detection

Abstract

A system and method involving lighting fixtures, a control network, a controller and other devices such as light sensors, input devices and network adapters for coordinating precise brightness and color schedules among the lighting fixtures while maintaining a high color reliability including provisions for managing a plurality of lighting fixtures. The lighting fixtures contain lighting elements selected such that when controlled properly, operating along a daytime locus, the resultant light output closely resembles sunlight on a cloudless day in spectral characteristics, and wherein the total flux of blue light can be adjusted from a relative level of 1-100% the maximum blue flux of the lighting fixture by controlling individual lighting elements.

Claims

1. A system for artificially generating sunlight in accordance with a daytime locus using spectral characteristics that resembles sunlight, said system automatically controlling at least one lighting fixture substantially along said daytime locus to generate said artificial sunlight, said system automatically changing brightness levels and color levels of a plurality of lighting element channels within said at least one lighting fixture which generate broad spectrum white light of color temperatures from 1800K to 6500K in accordance with a user-selected input, said system comprising:

at least two light sensors that detect the light emitted from said plurality of lighting element channels and generate respective signals of said detected light; and

a controller coupled to said plurality of lighting element channels and to said at least two light sensors, said controller using said respective signals of said detected light to drive said plurality of lighting element channels, said controller activating a color match algorithm for automatically creating respective drive signals for said plurality of lighting elements, said drive signals automatically varying a brightness level and a color level for each of said plurality of lighting element channels.

2. The system of claim 1 wherein said plurality of lighting element channels comprises at least three lighting element channels for controlling a color balance of said at least three lighting element channels.

3. The system of claim 2 wherein each one of said at least three lighting element channels comprises at least one lighting element.

4. The system of claim 3 wherein said at least three lighting element channels uses white lighting elements on two of said at least three lighting element channels and uses amber lighting elements on the other one of said at least three lighting element channels.

5. The system of claim 4 wherein said artificially generated sunlight by said system is defined within an XY chromaticity plane having x coordinates and y coordinates, and wherein each of said at least three lighting element channels comprises a region within said XY chromaticity plane:

a first region of said at least three channels is defined by x and y coordinates (0.30, 0.33), (0.35, 0.37), (0.35, 0.34) and (0.31, 0.31);

a second region of said at least three channels is defined by x and y coordinates (0.37, 0.39), (0.48, 0.43), (0.46, 0.39) and (0.36, 0.35); and

a third region of said at least three channels is defined by x and y coordinates (0.54, 0.42), (0.55, 0.45), (0.60, 0.40) and (0.57, 0.40).

6. The system of claim 3 wherein said at least three lighting element channels comprises four lighting element channels and wherein said four lighting element channels use white lighting elements on three of said four lighting element channels and use amber lighting elements on the other one of said four lighting element channels.

7. The system of claim 6 wherein said artificially generated sunlight by said system is defined within an XY chromaticity plane having x coordinates and y coordinates, and wherein each of said four lighting element channels comprises a region within said XY chromaticity plane:

a first region of said four channels is defined by x and y coordinates (0.30, 0.33), (0.35, 0.37), (0.35, 0.34) and (0.31, 0.31);

a second region of said four channels is defined by x and y coordinates (0.35, 0.37), (0.41, 0.41), (0.40, 0.37) and (0.35, 0.34);

a third region of said four channels is defined by x and y coordinates (0.41, 0.41), (0.48, 0.43), (0.46, 0.39) and (0.40, 0.37); and

a fourth region of said four channels is defined by x and y coordinates (0.54, 0.42), (0.55, 0.45), (0.60, 0.40) and (0.57, 0.40).

8. The system of claim 1 wherein each of said at least two light sensors is associated with a transimpedance amplifier whose sensitivity is automatically controlled by said controller for compensating for variation in brightness levels of said lighting fixture.

9. The system of claim 1 wherein said system automatically changes said brightness levels and color levels based on a user dimming level input.

10. The system of claim 9 wherein said user dimming level input further comprises a user color temperature input.

11. The system of claim 1 wherein said system automatically changes said brightness levels and color levels based on the time of day.

12. The system of claim 1 wherein said system automatically changes said brightness levels and color levels based on a geographic location.

13. The system of claim 1 wherein said system automatically changes said brightness levels and color levels based on a desired circadian response.

14. The system of claim 1 said system automatically changes said brightness levels and color levels based on a user input pertaining to activity from the group of activities including sleeping, working, studying, eating and resting.

15. The system of claim 1 wherein said system automatically changes said brightness levels and color levels based on an angle of the sun.

16. The system of claim 1 wherein said system can adjust said daytime locus to periods of time other than a 24 hour clock depending upon an application for artificially generating sunlight.

17. A method for artificially generating sunlight in accordance with a daytime locus using spectral characteristics that resembles sunlight, said method comprising:

providing a plurality of channels of lighting elements;

activating said plurality of channels to generate a composite light mixture;

detecting said composite light mixture by providing at least two light sensors that detect said composite light mixture and which generate respective signals of said detected light;

coupling a controller to said plurality of channels of lighting elements and to said at least two light sensors and wherein said controller uses said respective signals of said detected light to drive said plurality of channels of lighting elements;

controlling said plurality of channels of lighting elements, by said controller, based on said detected composite light mixture to generate artificial sunlight along said daytime locus by changing brightness levels and color levels of said plurality channels of lighting elements for generating broad spectrum white light of color temperatures from 1800K to 6500K in accordance with a user-selected input; and

said controller activating a color match algorithm for automatically creating respective drive signals for said plurality of channels of lighting elements and varying a brightness level and a color level for each of said plurality of channels of lighting elements.

18. The method of claim 17 wherein said plurality of channels of lighting elements comprises at least three lighting element channels for controlling a color balance of said at least three lighting element channels.

19. The method of claim 18 wherein each one of said at least three lighting element channels comprises at least one lighting element.

20. The method of claim 19 wherein said step of providing at least three lighting element channels comprises using white lighting elements on two of said at least three lighting element channels and using amber lighting elements on the other one of said at least three lighting elements.

21. The method of claim 20 wherein said artificially generated sunlight is defined within an XY chromaticity plane having x coordinates and y coordinates, and wherein each of said at least three lighting element channels comprises a region within said XY chromaticity plane and wherein said step of providing at least three lighting element channels comprises selecting lighting elements of the following XY chromaticity plane regions:

a first region of said at least three channels is defined by x and y coordinates (0.30, 0.33), (0.35, 0.37), (0.35, 0.34) and (0.31, 0.31);

a second region of said at least three channels is defined by x and y coordinates (0.37, 0.39), (0.48, 0.43), (0.46, 0.39) and (0.36, 0.35); and

a third region of said at least three channels is defined by x and y coordinates (0.54, 0.42), (0.55, 0.45), (0.60, 0.40) and (0.57, 0.40).

22. The method of claim 19 wherein said step of providing at least three lighting element channels comprises using four lighting element channels and wherein said four lighting element channels comprise white lighting elements on two of said at least three lighting element channels and using amber lighting elements on the other one of said at least three lighting elements.

23. The method of claim 22 wherein said artificially generated sunlight is defined within an XY chromaticity plane having x coordinates and y coordinates, and wherein each of said four lighting element channels comprises a region within said XY chromaticity plane and wherein said step of providing four lighting element channels comprises selecting lighting elements of the following XY chromaticity plane regions:

a first region of said four channels is defined by x and y coordinates (0.30, 0.33), (0.35, 0.37), (0.35, 0.34) and (0.31, 0.31);

a second region of said four channels is defined by x and y coordinates (0.35, 0.37), (0.41, 0.41), (0.40, 0.37) and (0.35, 0.34);

a third region of said four channels is defined by x and y coordinates (0.41, 0.41), (0.48, 0.43), (0.46, 0.39) and (0.40, 0.37); and

a fourth region of said four channels is defined by x and y coordinates (0.54, 0.42), (0.55, 0.45), (0.60, 0.40) and (0.57, 0.40).

24. The method of claim 17 wherein said step of detecting said composite light mixture comprises associating a transimpedance amplifier with each of said at least two light sensors and automatically controlling the sensitivity of said amplifier by said controller for compensating for variation in brightness levels of said lighting fixture.

25. The method of claim 17 wherein said step of controlling said plurality of channels of lighting elements comprises using a dimming level input.

26. The method of claim 25 wherein said step of using a dimming level input further comprises using a color temperature input.

27. The method of claim 17 wherein said step of controlling said plurality of channels of lighting elements comprises changing said brightness levels and color levels based on the time of day.

28. The method of claim 17 wherein said step of controlling said plurality of channels of lighting elements comprises changing said brightness levels and color levels based on a geographic location.

29. The method of claim 17 wherein said step of controlling said plurality of channels of lighting elements comprises changing said brightness levels and color levels based on a desired circadian response.

30. The method of claim 17 wherein said step of controlling said plurality of channels of lighting elements comprises changing said brightness levels and color levels based on a user input pertaining to activity from the group of activities including sleeping, working, studying, eating and resting.

31. The method of claim 17 wherein said wherein said step of controlling said plurality of channels of lighting elements comprises changing said brightness levels and color levels based on an angle of the sun.

32. The method of claim 17 wherein said step of controlling said plurality of channels comprising adjusting said daytime locus to periods of time other than a 24 hour clock depending upon an application for artificially generating sunlight.

33. The method of claim 17 wherein said step of automatically changing brightness levels and color levels comprises coordinating precise brightness and color schedules among said at least two lighting elements while maintaining a high color reliability.