What is claimed is the ornamental design for a light fixture coupler, as shown and described.
FIG. 1 is a perspective view as viewed from above of the light fixture coupler of our design;
FIG. 2 is a perspective view as viewed from below thereof;
FIG. 3 is a top plan view thereof;
FIG. 4 is a bottom plan view thereof; and,
FIG. 5 is a front elevational view thereof, where the rear, right and left side elevational views are identical images of this view and, therefore, have been omitted.
The broken lines in the drawings are directed to environment and are for illustrative purposes and form no part of the claimed design.
The light fixture coupler is not limited to the scale shown herein.