The ornamental design for a light mount, as shown and described.
FIG. 1 is a perspective view of an embodiment;
FIG. 2 is another perspective view of the embodiment;
FIG. 3 is a top view of the embodiment;
FIG. 4 is a bottom view of the embodiment;
FIG. 5 is a front view of the embodiment;
FIG. 6 is a back view of the embodiment;
FIG. 7 is a left side view of the embodiment; and,
FIG. 8 is a right side view of the embodiment.
The broken lines immediately adjacent the shaded areas represent the bounds of the claimed design while all other broken lines are directed to environment and are for illustrative purposes only; the broken lines form no part of the claimed design.