LIGHT EMITTING DEVICE (LED) LIGHTING SYSTEMS FOR EMITTING LIGHT IN MULTIPLE DIRECTIONS AND RELATED METHODS

• US 20090002979A1
• Filed: 10/30/2007
• Published: 01/01/2009
• Est. Priority Date: 06/27/2007
• Status: Abandoned Application

• Current Assignee: CREE Incorporated (Wolfspeed, Inc.)
• Original Assignee: CREE Incorporated (Wolfspeed, Inc.)
• Inventors: Hiller, Norbert, Medendorp, Nicholas W. JR.
• Application Number:
  US11/928,112
• Publication Number:
  US 20090002979A1
• Time in Patent Office: Days
• US Class Current: 362/231
• CPC Class Codes: F21V 13/08 the elements being filters or photoluminescent elements and reflectors
• CPC Class Codes: F21V 5/10 comprising photoluminescent material
• CPC Class Codes: F21V 7/0016 on lighting devices that also provide for direct lighting, e.g. by means of independent light sources, by splitting of the light beam, by switching between both lighting modes
• CPC Class Codes: F21V 9/32 characterised by the arrangement of the photoluminescent material
• CPC Class Codes: F21Y 2107/90 on two opposite sides of supports or substrates
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]

Abstract

Some embodiments of the present invention provide a lighting system for emitting light in multiple directions including one or more light emitting devices (LEDs) and a housing configured to receive the one or more LEDs. The one or more LEDs are configured to generate light in a first direction to illuminate a first area proximate to the lighting system. The housing is configured to reflect a portion of the generated light so as to allow a remaining portion of the generated light to pass through the housing in a second direction, different from the first direction, and illuminate a second area proximate to the lighting system. Related methods are also provided herein.

Claims

1. A lighting system for emitting light in multiple directions comprising:

at least one light emitting device (LED) configured to generate light in a first direction to illuminate a first area proximate to the lighting system; and

a housing configured to receive the at least one LED, the housing being configured to reflect a portion of the generated light so as to allow a remaining portion of the generated light to pass through the housing in a second direction, different from the first direction, and illuminate a second area proximate to the lighting system.

2. The lighting system of claim 1, wherein from about 75 to about 90 percent of a total amount of light generated by the at least one LED illuminates the first area and wherein from about 10 to about 25 percent of the total amount of light generated by the at least one LED illuminates the second area.

4. The lighting system of claim 1, further comprising a lens between the at least one LED and the first area proximate to the lighting system, the lens being configured to diffuse the light generated to illuminate the first area.

5. The lighting system of claim 1, wherein the housing defines a cavity, wherein the at least one LED is positioned to emit light into the cavity towards the housing and wherein the housing is configured to reflect at least a portion of the light emitted into the cavity to illuminate the first area proximate to the lighting system.

6. The lighting system of claim 5, wherein the housing comprises a semi-reflective housing including silver, chrome, metal alloys and/or any semi-reflective material.

7. The lighting system of claim 1, wherein the at least one LED comprises at least one blue LED and wherein the system further comprises:

a transparent lens between the at least one blue LED and the first area proximate the lighting system; and

a phosphor coating on the transparent lens between the transparent lens and the at least one blue LED, the phosphor coating being configured to allow the lighting system including the at least one blue LED to provide white light in the first direction.

8. The lighting system of claim 1, wherein the first direction is below the housing and the second direction is above the housing.

3. The lighting system of claim 3, wherein the viewing angle of the at least one LED is from about 100 to about 120 degrees.

9. A lighting system for emitting light in multiple directions comprising:

at least two light emitting devices (LEDs); and

a housing configured to receive a first of the at least two LEDs on a first surface of the housing and a second of the at least two LEDs on a second surface of the housing, the first of the two LEDs being configured to generate light in a first direction to illuminate a first area proximate to the lighting system and the second of the at least two LEDs being configured to generate light in a second direction, different from the first direction, to illuminate a second area proximate to the lighting system.

10. The lighting system of claim 9, wherein the housing is substantially reflective.

11. The lighting system of claim 10, wherein the housing defines a cavity, wherein the first surface of the housing comprises an internal surface of the cavity and wherein the second surface of the housing comprises an external surface of the cavity.

12. The lighting system of claim 11, wherein the first area is below the housing and the second area is above the housing.

13. A lighting system comprising:

at least one light emitting device (LED) configured to generate light in a first direction; and

a reflective housing configured to direct the generated light in a primary direction to illuminate a selected area proximate to the lighting system.

14. The lighting system of claim 13, wherein the housing is substantially reflective and defines a cavity.

15. The lighting system of claim 14, wherein the at least one LED is positioned on a first surface of the housing inside the cavity and configured to illuminate the selected area, the system further comprising:

at least one LED on a second surface of the housing outside the cavity and configured to generate light in a second direction, different from the first direction, to illuminate a second area, different from the first area, proximate the lighting system.

16. The lighting system of claim 15, wherein the selected area is below the housing and the second area is above the housing.

17. A method of emitting light in multiple directions in lighting systems including light emitting devices (LEDs) comprising:

generating light in a first direction to illuminate a first area proximate to the lighting system using at least one LED; and

reflecting a portion of the generated light in the first direction using a semi-reflective housing so as to allow a remaining portion of the generated light to pass through the housing in a second direction, different from the first direction, and illuminate a second area proximate to the lighting system.

18. The method of claim 17, further comprising adjusting an angle and/or position of the at least one LED to change an amount of light output by the lighting system.

19. The method of claim 18, wherein the light in the first direction comprises about 75 to about 90 percent of a total amount of light generated by the at least one LED and the light generated in the second direction is from about 10 to about 25 percent of the total amount of light generated by the at least one LED.

20. The method of claim 17, further comprising diffusing the light generated in the first direction using a lens between the at least one LED and the first area proximate to the lighting system.

21. The method of claim 17, wherein the first direction is below the housing and the second direction is above the housing.

22. A method for emitting light in multiple directions using lighting systems including light emitting devices (LEDs) comprising:

generating light in a first direction to illuminate a first area proximate to the lighting system using a first of at least two LEDs positioned on a first surface of the housing; and

generating light in a second direction, different from the first direction, to illuminate a second area proximate to the lighting system using a second of the at least two LEDs positioned on a second surface of the housing.