Thermally-managed LED-based recessed down lights

• US 7,677,770 B2
• Filed: 01/09/2007
• Issued: 03/16/2010
• Est. Priority Date: 01/09/2007
• Status: Active Grant

• Current Assignee: Lighting Science Group Corporation (Pegasus Capital Advisors, L.P.)
• Original Assignee: Lighting Science Group Corporation (Pegasus Capital Advisors, L.P.)
• Inventors: Mazzochette, Joseph B.
• Primary Examiner(s): Payne, Sharon E
• Application Number:
  US11/621,131
• Publication Number:
  US 20080165535A1
• Time in Patent Office: 1,162 Days
• Field of Search: 362/373, 362/294, 362/264, 362/345, 362/364, 361/694, 361/695, 361/697, 174/16.01, 174/16.3, 165/80.3, 165/104.33, 165/104.34, 165/122, 454/184
• US Class Current: 362/364
• CPC Class Codes: F21S 8/026 intended to be recessed in a ceiling or like overhead structure, e.g. suspended ceiling
• CPC Class Codes: F21V 23/003 the elements being electronics drivers or controllers for operating the light source, e.g. for a LED array
• CPC Class Codes: F21V 29/67 characterised by the arrangement of fans
• CPC Class Codes: F21V 29/673 the fans being used for intake
• CPC Class Codes: F21V 29/83 the elements having apertures, ducts or channels, e.g. heat radiation holes
• CPC Class Codes: F21V 7/041 with conical or pyramidal surface
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]

Abstract

An LED down light replacement apparatus is disclosed for insertion into a recessed-light housing can, which includes an LED light source, a means for mounting said LED light source within the housing can, an LED driver circuit electrically connected to the LED light source, a heat sink in thermal contact with the LED light source, and means for removing heat generated by the LED light source. The means for removing heat generated by the LED light source can include a fan and/or ventilation holes in the top of the housing can.

Claims

1. An LED down light replacement apparatus for insertion into a recessed-light housing can, comprising:

a reflector cone;

a ventilation cone disposed about said reflector cone, said ventilation cone and said housing can defining a gap;

an LED light source positioned adjacent said reflector cone;

means for mounting said LED light source, said reflector cone, and said ventilation cone within the housing can;

an LED driver circuit electrically connected to said LED light source; and

,

means for removing heat generated by said LED light source, wherein said means for removing heat includes;

a fan arranged between said ventilation cone and said housing can to move air from within said ventilation cone and past said LED light source and through said gap; and

,

a heat sink in thermal communication with said LED light source and mounted between said ventilation cone and said fan.

2. The LED down light replacement apparatus of claim 1, wherein said fan is a low noise fan.

3. The LED down light replacement apparatus of claim 1, wherein said ventilation cone is mounted substantially below said heat sink.

4. The LED down light replacement apparatus of claim 1, wherein said means for removing heat generated by said LED light source further includes:

a top portion of said housing having one or more vent holes; and

,

wherein said heat sink receives air through said ventilation cone, said air being thence directed out through the vent holes in said top portion of said housing can in a direction substantially opposite a direction light is emitted from said LED light source.

5. The LED down light replacement apparatus of claim 1, further including an electrical junction box for supplying AC current to said LED driver circuit, wherein said LED driver circuit is mounted in or overlying said junction box.

6. The LED down light replacement apparatus of claim 1, wherein said LED light source further comprises one or more blue LEDs coated with a phosphor to produce white light.

7. The LED down light replacement apparatus of claim 1, wherein said LED light source operates at a recommended full power rating in the range of about 2 watts and 150 watts.

8. The LED down light replacement apparatus of claim 7, wherein said LED light source operates at a recommended full power rating in the range of about 5 watts and 50 watts.

9. The LED down light replacement apparatus of claim 1, wherein said LED light source produces at least 100 lumens.

10. An LED down light apparatus, comprising:

an LED light source;

a recessed-light housing can comprising means for mounting said LED light source within said housing can;

a ventilation cone coupled between said LED light source and said housing can, said ventilation cone defining a substantially hollow interior portion having an open end, said ventilation cone and said housing can defining a gap therebetween, said ventilation cone further having a plurality of vent holes between said gap and said hollow portion adjacent said open end;

an LED driver circuit electrically connected to said LED light source; and

,

means for removing heat generated by said LED light source, wherein said means for removing heat is positioned between said ventilation cone and said housing can, said means for removing heat being arranged to direct air from said ventilation cone inner portion through said gap and out said plurality of vent holes into said interior portion.

11. The LED down light apparatus of claim 10, wherein said means for removing heat generated by said LED light source further comprises a heat sink in thermal communication with said LED light source and wherein said heat sink is thermally disposed between said LED light source and said vent holes.

12. The LED down light apparatus of claim 11, wherein said means for removing heat generated by said LED light source further comprises a fan for directing heat generated by said light source through said vent.

13. The LED down light apparatus of claim 12, wherein said fan is a low noise fan.

14. The LED down light apparatus of claim 12, wherein said fan is mounted within said housing can.

15. The LED down light apparatus of claim 12, wherein air is received from said interior portion which is drawn past said heat sink through said fan, said air being thence directed out through said plurality of vent holes and into said interior portion.

16. The LED down light apparatus of claim 15, wherein said heat sink includes one or more vent holes for receiving air which is drawn in from said inner portion.

17. The LED down light replacement apparatus of claim 15, wherein said ventilation cone is thermally conductive.

18. The LED down light apparatus of claim 12, wherein said ventilation cone is mounted proximate said heat sink.

19. The LED down light apparatus of claim 18, wherein said ventilation cone is mounted substantially below said heat sink.

20. The LED down light apparatus of claim 12, further comprising an electrical junction box for supplying AC current to said LED driver circuit, wherein said LED driver circuit is mounted in or overlying said junction box.

21. The LED down light apparatus of claim 12, wherein said LED light source further comprises one or more blue LEDs coated with a phosphor to produce white light.

22. The LED down light apparatus of claim 12, wherein said means for mounting said LED light source within said housing can comprises an adjustment bracket which extends from said heat sink and is sized and shaped for adjustable attachment with a wall of said housing can.

23. The LED down light apparatus of claim 22, wherein said means for mounting said LED light source within said housing can further comprises a position adjustment screw for securing an end of said adjustment bracket to the wall of said housing can, wherein said adjustment screw allows for adjustment of the placement of said LED light source within said housing can.

24. The LED down light apparatus of claim 15, further comprising

a trim mounted to said housing can;

and,

a secondary optic mounted within said trim.

25. The LED down light apparatus of claim 10, wherein said LED light source operates at a recommended full power rating in the range of about 2 watts and 150 watts.

26. The LED down light apparatus of claim 25, wherein said LED light source operates at a recommended full power rating in the range of about 5 watts and 50 watts.

27. The LED down light apparatus of claim 10, wherein said LED light source produces at least 100 lumens.