Lighting Device

FIG. 1 is a top, right, and front isometric view of a lighting device showing my new design; FIG. 2 is a front elevation view thereof; FIG. 3 is a rear elevation view thereof; FIG. 4 is a right side elevation view thereof; FIG. 5 is a left side elevation view thereof; FIG. 6 is a top plan view thereof; and, FIG. 7 is a bottom plan view thereof. The broken lines illustrate portions of the lighting device and form no part of the claimed design.