Patent ID: 9605835
Date: 2017-03-28
CPC Classifications: F21K,F21V,F21Y,G01D,G01J,G09F,G09G,H04N

Claim:
1. A lighting panel, comprising: at least one substrate having a first side parallel to a principal plane of the lighting panel; a plurality of solid state lighting devices arranged on the first side of the at least one substrate and configured to emit light; a reflector on the first side of the at least one substrate; a brightness enhancement film on the reflector, wherein the reflector is arranged between the at least one substrate and the brightness enhancement film and the brightness enhancement film is configured to preferentially emit light having a first orientation from the lighting panel and to preferentially reflect light having a second orientation, different from the first orientation, back into the lighting panel, and a generally planar diffuser sheet between the reflector and the brightness enhancement film, wherein the light having the second orientation that is reflected back into the lighting panel is recycled within at least the diffuser sheet.