Patent ID: 9200775
Filing Date: 2015-12-01
Classification: F21S,F21V,G02B

Abstract:
1. A lighting assembly having a light output and comprising: a transflective surface, at least a portion of which is curved; a reflector having an inner major surface facing said transflective surface having a reflectivity greater than dictated by Fresnel equation at normal incidence: where R is reflectance at normal incidence and n is a refractive index of the material; an optical cavity between said transflective surface and said reflector having a length to depth ratio greater than 5:1; and a first light source positioned to introduce light into the optical cavity, wherein said transflective surface is semi-specularly reflective and exhibits a degree of angularly selective transmission of incident light such that the light output of said lighting assembly is homogenous and uniform along the length of said optical cavity, and wherein the inner major surface of said reflector is either (a) substantially parallel to at least 30 percent by area of the curved portion of the transflective surface, or (b) oriented to the curved portion of the transflective surface so that the separation between the two surfaces decreases along a distance away from the light source a maximum local ratio of decrease in separation (depth) to distance.