Lighting Device

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