FIG. 1 is a perspective view of the design for our luminaire support arm.

FIG. 2 is a bottom view of our design.

FIG. 3 is a right side view of our design.

FIG. 4 is a let side view of our design.

FIG. 5 is a rear view of our design.

FIG. 6 is a top view of our design; and,

FIG. 7 is a bottom view of our design.

The broken line showing environmental structure is for illustrative purposes only and forms no part of the claimed design.