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 left side elevation view thereof;
FIG. 5 is a right side elevation view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a front perspective view thereof, with a portion of the lighting device in an alternate configuration.
The dashed broken lines in FIGS. 1-7 show unclaimed portions of the lighting device. The dashed-dotted broken lines in FIGS. 1-7 show unclaimed boundaries between claimed and unclaimed subject matter. The oblique line shading in FIGS. 1-3 and 7 show a translucent or transparent material. The remaining line shading in FIGS. 1-7 show surface contours, not surface ornamentation. The bottom view is omitted and forms no part of the claimed design.