The ornamental design for end caps for a luminaire, as shown and described.
FIG. 1 is a bottom perspective view of the end caps for a luminaire of the present invention;
FIG. 2 is a left side view of the end caps for a luminaire of FIG. 1, the right side view being a mirror image thereof;
FIG. 3 is a top view of the end caps for a luminaire of FIG. 1;
FIG. 4 is a bottom view of the end caps for a luminaire of FIG. 1;
FIG. 5 is a front view of the end caps for a luminaire of FIG. 1, the rear view being a mirror image thereof; and,
FIG. 6 is an enlarged top perspective view of the front end cap of the end caps for a luminaire of FIG. 1, the top perspective view of the rear end cap of the end caps for a luminaire of FIG. 1 being a mirror image thereof.
The broken lines showing environmental structure are for illustrative purposes only and form no part of the claimed design.