Patent ID: 7563004

Claim:
A downlight fixture for directing light toward an area desired to be illuminated, comprising: a reflector assembly comprising a base member having a bottom peripheral edge and defining an opening positioned in a central portion of the base member, wherein the bottom peripheral edge extends circumferentially substantially symmetrically about the central portion of the base member; a light source for generating the light, the light source being mountable at least partially therein the opening of the reflector assembly; and a lens assembly selectively mountable to a recessed portion of the base member of the reflector assembly thereabout the opening of the reflector assembly, the lens assembly comprising: a) a lens having a curved central lens portion, the central lens portion having a substantially smooth exterior surface and an opposed prismatic surface that defines a concave face spaced from and facing the light source; and b) a means for generating a plurality of spaced regions of reduced brightness to control high angle glare optically comprising a plurality of adjoining elongate prismatic elements formed on the prismatic surface of the central lens portion, wherein each prismatic element has a curved surface facing toward the light source, wherein each pair of adjoining elongate prismatic elements form a common elongate cusp edge, wherein each elongate prismatic element of the plurality of adjoining elongate prismatic elements is configured such that a reverse ray impacting the elongate prismatic element proximate the common cusp edge at an angle of incidence ω of at least about 40° will undergo total internal reflection and be reflected back into the area to be illuminated to form a region of reduced brightness on the exterior surface of the lens.