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 from which light projects toward the front along a primary light direction, a side section outward of the chamber, and a channel along a portion of the side section and outward of the chamber, wherein at least a portion of the channel is inclined at an angle relative to horizontal and has an inlet, and an outlet above the inlet; and
a solid state emitter (SSE) carried by the housing at the side section, the SSE having an active portion and a back portion, the active portion facing inwardly toward the chamber at an acute angle relative to the primary light direction, and one of the active portion and the back portion being exposed to the channel;
wherein the channel has an inlet and an outlet that are configured to provide an airflow through the chamber that passes over the SSE.
2. The SSL device of claim 1 wherein the back portion of the SSE includes a plurality of thermally conductive projections extending into the channel.
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:
a surface of the reflective base is angled relative to the primary lighting direction by a first angle, phi;
a lighting surface of each of the at least one of the plurality of SSEs is angled relative to the primary lighting direction by a second angle, theta;
the surface of the reflective base and the lighting surface are angled relative to one another by a third angle, alpha; and
the first angle, phi, is approximately equal to the third angle, alpha, plus the second angle, theta.
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 discrete facets, and wherein individual SSE face a corresponding one of the discrete facets.
10. The SSL device of claim 6 wherein the channel is oriented generally vertically.