LED lamps for retrofit on high wattage metal halide ballasts
View Patent ↗According to some embodiments, a system and housing provide a lamp including a heat sink including: an annular tube including a first end and a second end, a plurality of fins extending radially from an exterior surface of the annular tube, wherein a length of each fin extends from the first end of the annular tube to the second end of the annular tube; a plurality of light sources in thermal contact with the heat sink; a driver circuit operative to provide the input voltage and current for the plurality of light sources; and a capper positioned at the second end of the annular tube, wherein the capper is operative to be received in a socket. Numerous other aspects are provided.
1. A lamp comprising:
a heat sink including:
an annular tube including a first end and a second end,
a plurality of fins extending radially from an exterior surface of the annular tube, wherein a length of each fin extends from the first end of the annular tube to the second end of the annular tube;
a plurality of light sources in thermal contact with the heat sink; and
a driver circuit operative to provide the input voltage and current for the plurality of light sources;
the lamp further comprising an airflow generator positioned at the first end of the annular tube.
2. The lamp of claim 1 , wherein a free-end of each fin is forked.
3. The lamp of claim 1 , wherein the light sources are light emitting diodes (LED)s.
4. The lamp of claim 1 , wherein the plurality of light sources are mounted on one or more printed circuit boards (PCB).
5. The lamp of claim 1 , wherein the driver circuit is positioned within the annular tube of the heat sink.
6. The lamp of claim 1 , wherein an internal diameter of the annular tube is in the range of 10-100 mm.
7. The lamp of claim 2 , wherein the forked free-end of each fin includes two or more tines.
8. The lamp of claim 4 , wherein the PCB is positioned between two adjacent fins along a length of the exterior surface of the annular tube between the first end and the second end.
9. The lamp of claim 1 , further comprising:
a plurality of internal fins extending from an interior surface of the annular tube.
10. The lamp of claim 1 , wherein the heat sink includes eight fins.
11. The lamp of claim 1 , wherein the driver includes a buck converter.
12. The lamp of claim 1 , wherein the airflow generator is operative to actively cool the lamp.
13. The lamp of claim 1 , wherein the flow of current to the airflow generator is in a direction from at least two LED light sources.
14. The lamp of claim 1 , further comprising:
a cover operative to cover the plurality of light sources.
15. The lamp of claim 1 , wherein the lamp is operative to fit within a standard outline of a lamp per the American National Standards Institute (ANSI).
16. A lamp comprising:
a heat sink including:
an annular tube including a first end and a second end,
a plurality of fins extending radially from an exterior surface of the annular tube, wherein a length of each fin extends from the first end of the annular tube to the second end of the annular tube;
a plurality of light sources in thermal contact with the heat sink; and
a driver circuit operative to provide the input voltage and current for the plurality of light sources;
wherein the lamp is configured to be retro-fit into a high intensity discharge (HID) fixture.
17. The lamp of claim 1 , wherein the plurality of light sources are linearly arranged.
18. The lamp of claim 1 , wherein the driver is operative to convert an output of a high intensity discharge (HID) ballast to DC current to operate the light sources.
19. The lamp of claim 18 , wherein the driver substantially eliminates one or more high ignition voltage spikes generated by the HID ballast.
20. A lamp comprising:
a heat sink including:
an annular tube including a first end and a second end,
a plurality of fins extending radially from an exterior surface of the annular tube, wherein a length of each fin extends from the first end of the annular tube to the second end of the annular tube;
a plurality of light sources in thermal contact with the heat sink; and
a driver circuit operative to provide the input voltage and current for the plurality of light sources;
wherein the plurality of light sources produce omnidirectional light, and wherein a length of the plurality of light sources mimics an arc-length of an HID lamp.
21. A housing comprising:
an annular tube including a first end and a second end;
a plurality of fins extending radially from an exterior surface of the annular tube; and
wherein a length of each fin extends from the first end of the annular tube to the second end of the annular tube;
wherein the housing is operative to be retro-fit into a high intensity discharge (HID) fixture.
22. The housing of claim 21 , wherein a free-end of each fin is forked.
23. The housing of claim 21 , further comprising:
a plurality of light sources in thermal contact with the housing and positioned between two adjacent fins along a length of the exterior surface of the annular tube between the first end and the second end.
24. The housing of claim 23 , wherein the fins are operative to dissipate heat generated by the plurality of light sources.