The ornamental design for a luminaire, as shown and described.
FIG. 1 is a perspective front right side view of the luminaire;
FIG. 2 is a front view of the luminaire;
FIG. 3 is a right side view of the luminaire;
FIG. 4 is a back view of the luminaire;
FIG. 5 is a left side view of the luminaire;
FIG. 6 is a top view of the luminaire; and,
FIG. 7 is a bottom view of the luminaire.
In an embodiment, the product is a long cylindrical luminaire having LEDs and a male connector on the one side as well as a female connector on the opposite side. The connectors can be used to connect two or more such luminaires together.