Abstract: A translucent end cap for an elongated luminaire having an upper metal housing and a lower translucent lens. The end cap has a vertical translucent face and a horizontal, inwardly extending perimeter wall. The cross-sectional shape of the end cap is different than that of the luminaire, and in particular an upper portion of the end cap and perimeter wall extends above and is non-contiguous with the outer or perimeter edge of the metal upper housing. The perimeter wall of the end cap transmits light from the interior of the luminaire in a vertical plane around the entirety of the luminaire, including above the metal housing for up-lighting. The non-contiguous end cap also provides an aesthetic cover for an upper metal housing with an irregular contour that includes a heat dissipating driver- or ballast-mounting channel with an air channel.