Luminaire

FIG. 1 is a bottom perspective view of a luminaire showing a first embodiment of the design; FIG. 2 is a front view thereof; FIG. 3 is a rear view thereof; FIG. 4 is a right side view thereof; FIG. 5 is a left side view thereof; FIG. 6 is a bottom view thereof; FIG. 7 is a top view thereof; FIG. 8 is a bottom perspective view of a luminaire showing a second embodiment of the design in a first configuration; FIG. 9 is a front view thereof; FIG. 10 is a rear view thereof; FIG. 11 is a right side view thereof; FIG. 12 is a left side view thereof; FIG. 13 is a bottom view thereof; FIG. 14 is a top view thereof; FIG. 15 is a bottom view thereof in a second configuration; FIG. 16 is a bottom view thereof in a third configuration; FIG. 17 is a bottom view thereof in a fourth configuration; and, FIG. 18 is a bottom view thereof in a fifth configuration. The portions of the luminaire shown in dotted lines do not form part of the claimed design. The dot-dash-dot lines do not form part of the claimed design and are used to illustrate boundaries of the design.