Mountable light

FIG. 1 is a perspective view of an ornamental design for a mountable light;

FIG. 2 is a side view of a first side of the ornamental design;

FIG. 3 is a side view of a second side of the ornamental design;

FIG. 4 is a side view of a third side of the ornamental design;

FIG. 5 is a side view of a fourth side of the ornamental design;

FIG. 6 is an end view of a first end of the ornamental design; and,

FIG. 7 is an end view of a second end of the ornamental design.

Broken lines in the illustrations of the DRAWING indicate unclaimed parts of the article that are not part of the design illustrated herein.