The ornamental design for a lightingdevice, as shown and described.
FIG. 1 is a perspective view of a lighting device showing my new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a left elevational view thereof;
FIG. 4 is a rear elevational view showing hitch thereof;
FIG. 5 is a right side elevational view thereof;
FIG. 6 is a top plan view thereof;
FIG. 7 is a bottom plan view thereof; and,
FIG. 8 is an enlarged fragmentary elevational view of the top portion visible in FIG. 4, with the remainder omitted for clarity of illustration.
The broken-line disclosure is understood to represent portions of the article in which the claimed design is embodied, but which forms no part of the claimed design.