Light emitting diode (LED) light fixture for a greenhouse and a greenhouse incorporating a LED light fixture

• US 8,714,774 B2
• Filed: 09/08/2011
• Issued: 05/06/2014
• Est. Priority Date: 09/08/2011
• Status: Active Grant

• Current Assignee: ABL IP Holding LLC (Acuity Brands, Inc.)
• Original Assignee: GE Lighting Solutions LLC (Savant Systems, LLC)
• Inventors: Dubuc, Eden
• Primary Examiner(s): BRUCE, DAVID VERNON
• Application Number:
  US13/227,584
• Publication Number:
  US 20130063930A1
• Time in Patent Office: 971 Days
• Field of Search: 362/217.05, 362/243, 362/244, 362/245, 362/249.02
• US Class Current: 362/244
• CPC Class Codes: A01G 7/045 with electric lighting
• CPC Class Codes: A01G 9/24 Devices or systems for heating, ventilating, regulating temperature , illuminating, or watering, in greenhouses, forcing-frames, or the like
• CPC Class Codes: A01G 9/249 Lighting means with special arrangements for promoting growth A01G7/045
• CPC Class Codes: F21S 4/28 rigid, e.g. LED bars
• CPC Class Codes: F21V 5/04 of lens shape
• CPC Class Codes: F21V 7/0008 providing for indirect lighting
• CPC Class Codes: F21Y 2103/10 comprising a linear array of point-like light-generating elements
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: Y02A 40/25 Greenhouse technology, e.g. cooling systems therefor
• CPC Class Codes: Y02P 60/14 Measures for saving energy, e.g. in green houses

Abstract

A greenhouse lighting fixture includes a Light Emitting Diode (LED) base support having a plurality of spaced-apart LEDs extending along a longitudinal axis of the LED base support. An optical element is coupled with the LED base support and has optical characteristics that result in at least 50% of the light produced by the LEDs being projected sideways from the fixture in oppositely directed side zones that flank a central zone wherein light is substantially blocked from projecting below the fixture. A greenhouse is encompassed that may include one or more of the LED lighting fixtures.

Claims

1. A greenhouse lighting fixture, comprising:

a Light Emitting Diode (LED) base support, said LED base support comprising a plurality of spaced-apart LEDs extending along a longitudinal axis of said LED base support; and

an optical element coupled with said LED base support, said optical element having optical characteristics that result in at least 50% of the light produced by said LEDs being projected sideways from said fixture in oppositely directed side zones that flank a central zone in which light is substantially blocked from projecting below said fixture.

2. The greenhouse lighting fixture of claim 1, wherein said side zones define an angular sector within a range of from horizontal relative to said LED base support to less than about 45°

below horizontal.

3. The greenhouse lighting fixture of claim 2, wherein said angular sector extends between about 5°

below horizontal to about 35°

below horizontal.

4. The greenhouse lighting fixture of claim 1, wherein said optical element comprises reflector structure disposed relative to said LEDs to reflect emitted light into said side zones and away from said central zone.

5. The greenhouse lighting fixture of claim 4, wherein said reflector structure comprises an inverted generally V-shaped reflector disposed vertically below said LEDs such that side faces of said reflector direct the emitted light into said side zones, said central zone defined below said reflector.

6. The greenhouse lighting fixture of claim 1, further comprising an optically neutral cover attached to said LED base support and enclosing said LEDs, said optical element configured on an inner face of said cover.

7. The greenhouse lighting fixture of claim 1, wherein said optical element is suspended from said LED base support, and further comprising an optically neutral cover attached to said LED base support and enclosing said LEDs and said optical element.

8. The greenhouse lighting fixture of claim 1, wherein said optical element comprises a linear refractive lens disposed relative to said LEDS such that light emitted from an exit face of said lens is directed into said side zones.

9. The greenhouse lighting fixture of claim 8, wherein said lens is a converging lens.

10. The greenhouse lighting fixture of claim 8, wherein said lens is a linear total internal reflection (TIR) lens.

11. The greenhouse lighting fixture of claim 1, wherein said LED base support is horizontally oriented such that said LEDs are downwardly oriented, said optical element disposed below said LEDs.

12. The greenhouse lighting fixture of claim 1, wherein said LED base support is vertically oriented, and further comprising a plurality of said LEDS sideways oriented along opposite sides of said LED base support.

13. The greenhouse lighting fixture of claim 12, wherein said optical element comprises sideways oriented reflector structure extending along each opposite side of said LED base support to direct the emitted light into said side zones, said central zone defined below said oppositely oriented reflector structure.

14. The greenhouse lighting fixture of claim 12, wherein said optical element comprises a linear refractive lens disposed across from each opposite side of said LED base support such that light emitted from an exit face of said lens is directed into said side zones.

15. The greenhouse lighting fixture of claim 14, wherein said lens is a converging lens.

16. A greenhouse, comprising:

a Light Emitting Diode (LED) lighting fixture, said LED lighting fixture further comprising

a LED base support having a plurality of spaced-apart LEDs extending along a longitudinal axis of said LED base support; and

an optical element configured with said LED base support, said optical element having optical characteristics that result in at least 50% of the light produced by said LEDs being projected sideways from said fixture in oppositely directed side zones that flank a central zone wherein light is blocked from projecting below said fixture;

wherein said side zones define an angular sector within a range of from horizontal relative to said LED base support to less than about 60°

below horizontal.

17. The greenhouse of claim 16, wherein said optical element comprises reflector structure disposed relative to said LEDs to reflect emitted light into said side zones and away from said central zone.

18. The greenhouse of claim 16, wherein said optical element comprises a linear refractive lens disposed relative to said LEDS such that light emitted from an exit face of said lens is directed into said side zones.

19. The greenhouse of claim 18, wherein said lens is a converging lens.

20. The greenhouse of claim 18, wherein said lens is a combination of a linear total internal reflection (TIR) lens disposed opposite from said LEDs and oppositely oriented side refractive lenses.