FIG. 1 is a perspective view of a luminaire having a medially disposed enclosure and a heat sink according to the present invention. FIG. 2 is an elevation view of the luminaire illustrated in FIG. 1. FIG. 3 is a top plan view of the luminaire illustrated in FIG. 1; and, FIG. 4 is a bottom plan view of the luminaire illustrated in FIG. 1.