Lighting fixture optical assembly including relector/refractor and shroud

An optical assembly enables improved optical control of an uplight illumination component and a downward illumination component. The optical assembly includes a reflector/refractor and a shroud carried by the reflector/refractor. The reflector/refractor has a predefined shape and has a plurality of reflector/refractor prisms on an exterior body surface for reflecting and refracting light. The shroud has a plurality of prisms disposed proximate to the reflector/refractor prisms for providing optical control of incident light from the reflector/refractor. The shroud is formed substantially corresponding to the predefined shape of the reflector/refractor, surrounding and spaced from the reflector/refractor exterior body surface. The shroud is formed, for example, by vacuum forming or by injection molding technique. The shroud provides optical control of incident light from the reflector/refractor, generally refracting incident light from the reflector/refractor. The shroud prisms are generally aligned with the reflector/refractor prisms. The reflector/refractor prisms and the shroud prisms are substantially vertical prisms. The shroud is formed of a light transmitting material, such as a transparent or translucent polymeric material. The shroud is formed, for example, by blending transparent materials having different refractive indices, or by adding a pigment to a transparent material. The shroud optionally includes pigmentation to provide a selected color for the optical assembly. The shroud can be metalized to block the uplight component or to provide a portion of the transmitted illumination to certain uplight areas, or reflect and block the illumination.