Patent ID: 8585273

Claim:
An illumination assembly comprising: a plurality of spaced apart solid state light-emitting devices, each having a light-emitting surface that outputs a primary light having a primary wavelength spectrum; and a light guide comprising a light homogenization region and a light extraction region, light from the light-emitting devices propagating within the light guide and the light homogenization region and the light extraction region extending from a top surface of the light guide to a bottom surface of the light guide; wherein: the light homogenization region is configured to receive the primary light emitted by the solid state light-emitting devices and includes a wavelength converting material that converts the primary light to a secondary light having a secondary wavelength spectrum different from the primary wavelength spectrum, the wavelength converting material having different densities for at least two locations in the light homogenization region including a first density at a location disposed directly in front of the light-emitting surface of one of the light-emitting devices and a second density being different from the first density at a location in-between the light-emitting surfaces of the one and an adjacent one of the light-emitting devices; the light extraction region has a length along which the secondary light propagates and an emission surface through which the secondary light is emitted; and the light guide is generally rectangular in a plane parallel to the emission surface and the light guide further comprises a light input edge at each corner and the light-emitting devices each are located at a respective one of the light input edges to input light into the light homogenization region of the light guide at the corners.