Luminaire

FIG. 1 is a top isometric view of an ornamental design for a luminaire;

FIG. 2 is a bottom isometric view of the luminaire of FIG. 1 ;

FIG. 3 is a front elevation view, which is identical to the back elevation, right side elevation, and left side elevation views, of the luminaire of FIG. 1 ;

FIG. 4 is a top plan view of the luminaire of FIG. 1 ; and,

FIG. 5 is a bottom plan view of the luminaire of FIG. 1 .

The broken lines (where present) in all FIGS. illustrate portions of the luminaire that form no part of the claimed design.