Light fixture and associated LED board and monolithic optic

• US 8,506,118 B2
• Filed: 03/16/2012
• Issued: 08/13/2013
• Est. Priority Date: 01/26/2009
• Status: Active Grant

• Current Assignee: Lighting Science Group Corporation (Pegasus Capital Advisors, L.P.)
• Original Assignee: Lighting Sciene Group Corporation
• Inventors: Maxik, Fredric S., Gibler, Zach, Bretschneider, Eric, Henderson, David, Widjaja, Addy
• Primary Examiner(s): Alavi, Ali
• Application Number:
  US13/421,910
• Publication Number:
  US 20120176793A1
• Time in Patent Office: 515 Days
• Field of Search: 315/185.R, 315/191, 315/192, 362/244, 362/326, 362/294, 362/373, 362/341, 362/145, 362/431
• US Class Current: 362/235
• CPC Class Codes: F21S 8/088 with lighting device mounted on top of the standard, e.g. for pedestrian zones
• CPC Class Codes: F21W 2131/10 Outdoor lighting
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]

Abstract

An embodiment of the invention is directed to a light fixture useful for area lighting. The light fixture includes a housing having a base and a top, and a light emitting diode (LED) light emission module disposed within the housing. The light emission module includes a centrally disposed aperture that receives a centrally disposed power lead for powering the light emission module.

Claims

1. A light fixture useful for area lighting, the light fixture comprising:

a housing; and

a light emitting diode (LED) light emission module disposed within the housing, the light emission module having an LED board, the LED board comprising;

a monolithic substrate having a first side and a second side,

a first group of LEDs arranged on the first side, the first group of LEDs having a first plurality of LEDs electrically coupled in series;

a second group of LEDs arranged on the first side adjacent to the first group of LEDs, the second group of LEDs having a second plurality of LEDs electrically coupled in series, wherein the second group of LEDs is electrically coupled in parallel with the first group of LEDs.

2. The light fixture of claim 1, wherein the housing includes a base and a top coupled to the base.

3. The light fixture of claim 2, wherein the light emission module is disposed at least partially in the base with light emission therefrom being oriented in an upward direction away from the ground.

4. The light fixture of claim 2, wherein the light emission module is disposed at least partially in the top with light emission therefrom being oriented in a downward direction toward the ground.

5. The light fixture of claim 1, wherein the light emission module further comprises:

a support;

a heat sink coupled to the support;

the monolithic substrate coupled to the heat sink; and

a monolithic optic disposed proximate to the monolithic substrate.

6. The light fixture of claim 5, wherein at least one of the monolithic optic, the monolithic substrate, the heat sink and the support has a centrally disposed aperture that receives a centrally disposed power lead for powering the light emission module.

7. The light fixture of claim 5, wherein the monolithic substrate has a thermally conductive layer, the thermally conductive layer being disposed adjacent to and in thermal communication with the heat sink.

8. The light fixture of claim 5, wherein at a plane defined by an interface of the monolithic substrate and the heat sink, the monolithic substrate has an outside profile that is equal to or greater than an outside profile of the heat sink.

9. The light fixture of claim 5, wherein:

the light emission module is disposed in the housing with light emission therefrom being oriented downward toward the ground;

the monolithic optic has a plurality of lenses, each of the lenses being associated with a corresponding one of the LEDs in the first and second group of LEDs; and

each lens and corresponding LED has a same emission pattern oriented in a same direction that produces a Type-III emission pattern on the ground.

10. The light fixture of claim 1, wherein each of the LEDs in the first and second group of LEDs are disposed such that light emission from each LED is directed in a same direction.

11. The light fixture of claim 1, further comprising a thermally conductive layer disposed on the second side of the monolithic substrate.

12. The light fixture of claim 1, wherein a number of LEDs in the first group of LEDs is equal to a number of LEDs in the second group of LEDs.

13. The light fixture of claim 1, wherein the monolithic substrate has a centrally disposed aperture that receives a centrally disposed power lead for powering the first group of LEDs and the second group of LEDs.

14. The light fixture of claim 1, further comprising a light transmissible encapsulate disposed over each of the LEDs.

15. A light fixture comprising:

a housing comprising a base and a top; and

a light emitting diode (LED) light emission module disposed within the housing, the light emission module comprising;

a plurality of LEDs;

a platform having a first side oriented towards the plurality of LEDs, and a second side oriented away from the plurality of LEDs; and

a plurality of convex lenses disposed on the second side, wherein each of the plurality of convex lenses is associated with one of the plurality of LEDs.

16. The light fixture of claim 15, wherein the light emission module is disposed at least partially in the base with light emission therefrom being oriented in an upward direction away from the ground.

17. The light fixture of claim 15, wherein the light emission module is disposed at least partially in the top with light emission therefrom being oriented in a downward direction toward the ground.

18. A light fixture comprising:

a housing comprising a base and a top; and

a light emitting diode (LED) light emission module disposed within the housing, the light emission module comprising;

a plurality of LEDs;

a platform having a first side oriented towards the plurality of LEDs, and a second side oriented away from the plurality of LEDs; and

a plurality of convex lenses disposed on the second side, wherein each of the plurality of convex lenses is associated with one of the plurality of LEDs;

wherein the light emission module further comprises;

a support;

a heat sink coupled to the support;

a monolithic substrate coupled to the heat sink; and

the platform disposed proximate to the monolithic substrate.

19. The light fixture of claim 18, wherein at least one of the monolithic substrate, the heat sink and the support has a centrally disposed aperture that receives a centrally disposed power lead for powering the light emission module.

20. The light fixture of claim 18, wherein at a plane defined by an interface of the monolithic substrate and the heat sink, the monolithic substrate has an outside profile that is equal to or greater than an outside profile of the heat sink.