FIG. 1 is a bottom perspective view of a luminaire showing a first embodiment of our new and ornamental design;
FIG. 2 is a top perspective view thereof;
FIG. 3 is a bottom plan view thereof;
FIG. 4 is a top plan view thereof;
FIG. 5 is a side elevation view thereof;
FIG. 6 is an alternate side elevation view thereof;
FIG. 7 is a front elevation view thereof;
FIG. 8 is a rear elevation view thereof;
FIG. 9 is a bottom perspective view of a luminaire showing a second embodiment of our new and ornamental design;
FIG. 10 is a top perspective view thereof;
FIG. 11 is a bottom plan view thereof;
FIG. 12 is a top plan view thereof;
FIG. 13 is a side elevation view thereof;
FIG. 14 is an alternate side elevation view thereof;
FIG. 15 is a front elevation view thereof;
FIG. 16 is a rear elevation view thereof;
FIG. 17 is a bottom perspective view of a luminaire showing a third embodiment of our new and ornamental design;
FIG. 18 is a top perspective view thereof;
FIG. 19 is a bottom plan view thereof;
FIG. 20 is a top plan view thereof;
FIG. 21 is a side elevation view thereof;
FIG. 22 is an alternate side elevation view thereof;
FIG. 23 is a front elevation view thereof; and,
FIG. 24 is a rear elevation view thereof.
The portions of the luminaire shown in dash-dash lines in the figures attached hereto form no part of the claimed design. The portions of the luminaire shown in dot-dash lines in the figures attached hereto are boundary lines that are used to separate the claimed elements of the design from the disclaimed elements of the design. The claimed subject matter in the design extends to the boundary lines but does not include the boundary lines. The portions of the luminaire that are encompassed within the dot-dash lines form no part of the claimed design.