Patent ID: 8414147

Claim:
A solid state lighting device comprising a relatively rigid, thermally conductive, reflective plate having opposite sides; a mounting frame having opposite first and second sides and an open center; a printed circuit board with front and back sides and a plurality of LEDs mounted to the front side, the back side of the board being substantially flat, said board being supported by the frame so that the back side of the board is more or less flush with the first side of the frame and the LEDs are opposite said open center; a cup-like light diffuser having a rim engaged over the second side of the mounting frame so that the diffuser surrounds the frame and covers the LEDs, said frame, printed circuit board and diffuser constituting a first subassembly, and fastening devices for fastening the first subassembly against one side of the plate so that said back side of the board is pressed against the plate and the diffuser rim abuts the plate, whereby when the LEDs are energized, a maximum amount of light from the LEDs is directed through the diffuser and waste heat from the LEDs is efficiently conducted away by the plate.