The ornamental design for a lightingdevice, as shown and described.
FIG. 1 is a front perspective view of a lighting device showing our 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;
FIG. 7 is a bottom plan view thereof; and,
FIG. 8 is a partial exploded view thereof with a cover portion of the lighting device shown in a removed position.
The dashed broken lines in FIGS. 1-8 show unclaimed portions of the lighting device. The dashed-dotted broken lines in FIGS. 1 and 4-8 show an unclaimed boundary between claimed and unclaimed subject matter. The oblique line shading in FIGS. 1, 2, 7, and 8 show a translucent or transparent material. The remaining line shading in FIGS. 1-8 show surface contours, not surface ornamentation.