FIG. 1 is a perspective view showing a first embodiment of the luminaire; FIG. 2 is a bottom plan view of the first embodiment; FIG. 3 is a left side elevational view of the first embodiment, the right side being a mirror image thereof; FIG. 4 is a front elevational view of the first embodiment; FIG. 5 is a rear elevational view of the first embodiment; FIG. 6 is a top plan view of the first embodiment, the top plan view for the second embodiment being identical thereto; FIG. 7 is a perspective view showing a second embodiment of the luminaire; FIG. 8 is a bottom plan view of the second embodiment; FIG. 9 is a left side elevational view of the second embodiment, the right side being a mirror image thereof; FIG. 10 is a front elevational view of the second embodiment; and, FIG. 11 is a rear elevational view of the second embodiment. The broken line disclosure is shown for illustrative purposes only and forms no part of the claimed design.