Lighting Device

FIG. 1 is a front isometric view of a lighting device showing the new design; FIG. 2 is a rear isometric view thereof; FIG. 3 is a front view thereof; FIG. 4 is a side view thereof; FIG. 5 is an opposite side view thereof; FIG. 6 is a rear view; FIG. 7 is a top view; and, FIG. 8 is a bottom view. The broken lines shown in the drawings depict portions of the lighting device and form no part of the claimed design.