Solid state lights with cooling structures
A solid state lighting (SSL) with a solid state emitter (SSE) having thermally conductive projections extending into an air channel, and methods of making and using such SSLs. The thermally conductive projections can be fins, posts, or other structures configured to transfer heat into a fluid medium, such as air. The projections can be electrical contacts between the SSE and a power source. The air channel can be oriented generally vertically such that air in the channel warmed by the SSE flows upward through the channel.
1. A solid state lighting (SSL) device, comprising:
a housing having a front, a back, a chamber, a side section between the front and the back, and a channel outward of the central chamber and passing along the side section from the front to the back, wherein light exits the chamber along a primary light direction of the SSL device; and
a solid state emitter (SSE) having a light-emitting active portion facing inwardly toward the chamber at an angle with respect to the primary light direction such that the SSE emits light toward the back of the housing and a back portion facing toward the side section;
wherein the back portion of the SSE includes a plurality of thermally conductive projections extending into the channel,
wherein the channel is configured to permit a flow of air across the SSE, wherein the channel has a first width at an inlet of the channel and a second width greater than the first width at an outlet of the channel, and wherein the channel is configured with an expansion zone between the plurality of thermally conductive projections and the outlet.
2. The SSL device of claim 1 , wherein the channel is configured to permit the flow of air across at least one of the active portion or the back portion of the SSE.
3. The SSL device of claim 1 wherein the channel is open to ambient air at one of the front or the back of the housing.
4. The SSL device of claim 1 , further comprising an air pressurizer positioned relative to the channel to drive air through the channel.
5. The SSL device of claim 1 , further comprising a reflector in an optical path of the SSE, wherein light from the SSE is reflected from the reflector and out of the SSL device.
6. A solid state lighting (SSL) device, comprising:
a housing having a front, a back and side section defining a chamber, wherein light exits the chamber along a primary light direction of the SSL device;
a plurality of solid state emitters (SSEs) at the side section and having an active portion facing inwardly toward the chamber and away from the front;
a channel in the housing passing along the side section from the front of the housing to the back of the housing, the channel being positioned outwardly of the chamber, wherein a portion of at least one of the plurality of SSEs is exposed to the channel, and wherein the channel is oriented such that air in the channel heated by the at least one of the plurality of SSEs flows through the channel,
wherein the portion of the at least one of the plurality of SSEs comprises a plurality of thermally conductive projections extending into the channel, and
wherein the channel has a first width at an inlet of the channel and a second width greater than the first width at an outlet of the channel, and wherein the channel is configured with an expansion zone between the plurality of thermally conductive projections and the outlet.
7. The SSL device of claim 6 , further comprising a reflector in the chamber, wherein the SSEs face the reflector such that light from the SSEs is reflected from the reflector out of the SSL device.
8. The SSL device of claim 7 wherein the reflector comprises a first surface and a second surface, and wherein the SSEs are arranged in a first row and a second row with the first row of SSEs directed toward the first surface and the second row of SSEs directed toward the second surface.
9. The SSL device of claim 7 wherein the reflector comprises a cone, and wherein the SSEs are arranged in a generally circular pattern facing the cone.
10. The SSL device of claim 7 wherein the reflector comprises discrete facets, and wherein individual SSE face a corresponding one of the discrete facets.
11. The SSL device of claim 6 wherein the channel is oriented generally vertically.