Patent ID: 9127816
Filing Date: 2015-09-08
Classification: F21K,F21V,F21Y,Y10T

Abstract:
1. An apparatus comprising: a light emitting diode (LED) light engine comprising a disc-shaped body having a front side including a circular perimeter defining a circular sidewall, one or more LED devices disposed on the front side of an LED light engine substrate, said sidewall being inwardly tapered from a first edge adjacent to the front side to a second edge adjacent an opposed back side, said front side having a diameter greater than a distance between the first edge and the second edge, said LED devices illuminating an interior of an at least substantially spherical optical diffuser; a heat sink having a mating receptacle for the LED light engine said heat sink including a plurality of fins each having an interior edge facing at least a first portion of said optical diffuser, the LED light engine substrate and the mating receptacle of the heat sink defining a tapered fitting along the interior edges by which the LED light engine is retained in the mating receptacle of the heat sink along only said interior edges of said fins which form the tapered fitting; and wherein the LED light engine substrate has a back side opposite the front side, at least a central area of the back side of the LED light engine not contacting the heat sink; and wherein said heat sink further defines a hollow region, said hollow region forming an open space adjacent the back side of the LED light engine substrate.