The ornamental design for a mounting bracket for puck light, as shown and described.
FIG. 1 is a worm's eye perspective for a new design for a mounting bracket with a bayonette type interlock for attaching a light fixture, shown exploded away in phantom lines, and also shown in phantom lines are stand-offs, or posts, and internal ribs on the bracket, throughout the figures which form no part of the claimed design;
FIG. 2 is a side elevation of the bracket of FIG. 1, again with stand-offs and the light fixture shown in phantom lines which form no part of the claimed design;
FIG. 3 is a bottom plan or front view of the bracket of FIG. 1;
FIG. 4 is a top plan or back view of the bracket of FIG. 1; and,
FIG. 5 is a side elevation showing the opposite side of the bracket shown in FIG. 2.