Troffer-style lighting fixture with specular reflector
View Patent ↗An indirect troffer-style lighting fixture that is particularly well-suited for use with solid state light sources. An elongated heat sink with a mount surface for light sources runs longitudinally along the fixture. To facilitate heat dissipation, a portion of the heat sink is exposed to the ambient room environment. An elongated specular reflector also runs along the device proximate to the heat sink. The heat sink and the specular reflector are mounted such that a spatial relationship is maintained. Some of the light from the sources impinges directly on the specular reflector and is redirected towards a back surface. The back surface defines a luminous surface that receives light directly from the sources and redirected light from the specular reflector. The back surface and the heat sink mechanically obscure any images of the light sources in the specular reflector such that they are not visible in a viewing area.
1. A lighting fixture, comprising:
an elongated heat sink comprising a mount surface;
an elongated specular reflector proximate to said mount surface, said heat sink and said specular reflector configured such that a spatial relationship is maintained between said heat sink and said specular reflector; and
a back surface proximate to said elongated specular reflector.
2. The lighting fixture of claim 1 , further comprising at least one cluster of light emitting diodes (LEDs) on said mount surface.
3. The lighting fixture of claim 1 , further comprising at least one cluster of LEDs, each of said clusters comprising at least one red LED and at least one blue-shifted yellow (BSY) LED.
4. The lighting fixture of claim 1 , said specular reflector comprising at least two parabolic reflective surfaces shaped to redirect light toward said back surface.
5. The lighting fixture of claim 1 , said specular reflector comprising a metal-coated surface.
6. The lighting fixture of claim 1 , said back surface comprising a diffuse reflective surface.
7. The lighting fixture of claim 1 , further comprising at least one light source on said mount surface.
8. The lighting fixture of claim 7 , said back surface shaped to receive light redirected from said specular reflector and light emitted directly from said light source such that substantially all light emitted from said light source impinges on said back surface.
9. The lighting fixture of claim 7 , further comprising a lens over said at least one light source on said mount surface.
10. The lighting fixture of claim 7 , further comprising a flame barrier over said at least one light source on said mount surface.
11. The lighting fixture of claim 1 , wherein said back surface is at least partially light transmissive.
12. The lighting fixture of claim 1 , said back surface comprising a curved shape.
13. The lighting fixture of claim 1 , said back surface comprising a corrugated shape.
14. The lighting fixture of claim 1 , said back surface comprising a faceted surface.
15. A lighting fixture, comprising:
an elongated heat sink comprising a mount surface;
an elongated specular reflector proximate to said mount surface, said heat sink and said specular reflector configured such that a spatial relationship is maintained between said heat sink and said specular reflector;
a back surface proximate to said elongated specular reflector; and
a lens plate extending from said heat sink to said back surface.
16. The lighting fixture of claim 1 , further comprising at least one end piece to which the ends of said heat sink and said specular reflector are mounted.
17. The lighting fixture of claim 1 , said back surface extending from both lateral sides of said elongated specular reflector.
18. A lighting assembly, comprising:
a protective housing comprising at least one end piece and a back surface;
an elongated heat sink mounted to said at least one end piece, said heat sink comprising a mount surface;
an elongated specular reflector on said back surface, such that a spatial relationship is established between said specular reflector and said heat sink;
at least one light source on said mount surface; and
a control circuit for controlling said at least one light source.
19. The lighting assembly of claim 18 , said at least one light source comprising at least one cluster of light emitting diodes (LEDs) on said mount surface.
20. The lighting assembly of claim 18 , said at least one light source comprising at least one cluster of LEDs, each of said clusters comprising at least one red LED and at least one blue-shifted yellow (BSY) LED.
21. The lighting assembly of claim 18 , said specular reflector comprising at least two parabolic reflective surfaces shaped to redirect light toward said back surface.
22. The lighting assembly of claim 18 , said specular reflector comprising a metal-coated surface.
23. The lighting assembly of claim 18 , said back surface comprising a diffuse reflective surface.
24. The lighting assembly of claim 18 , further comprising a lens over said at least one light source on said mount surface.
25. The lighting assembly of claim 18 , further comprising a flame barrier over said at least one light source on said mount surface.
26. The lighting assembly of claim 18 , wherein said back surface is at least partially light transmissive.
27. The lighting assembly of claim 18 , said back surface comprising a curved shape.
28. The lighting assembly of claim 18 , said back surface comprising a corrugated shape.
29. The lighting assembly of claim 18 , said back surface comprising a faceted surface.
30. The lighting assembly of claim 18 , further comprising a lens plate extending from said heat sink to said back surface.
31. A method of lighting a surface:
emitting light from a light source over a range of angles;
redirecting at least a portion of said light with a specular reflector toward a luminous surface;
receiving light directly from said light source and from said specular reflector at said luminous surface; and
mechanically obscuring images of said light source on said specular reflector from a viewing area.