FIG. 1 is a rear perspective view showing the new, original, and ornamental design of a light; FIG. 2 is a right side elevation view thereof; FIG. 3 is a left side elevation view thereof; FIG. 4 is a top side plan view thereof; FIG. 5 is a bottom side plan view thereof; FIG. 6 is a rear side elevation view thereof; and, FIG. 7 is a front side elevation view thereof. The broken line disclosure represents portions of the light which form no part of the claimed design.