Lighting device

FIG. 1 is an isometric view of a top, right, and front side of an ornamental design for a lighting device;

FIG. 2 is a front elevational view of the lighting device of FIG. 1 ;

FIG. 3 is a top plan view of the lighting device of FIG. 1 ;

FIG. 4 is a bottom plan view of the lighting device of FIG. 1 ;

FIG. 5 is a right side elevational view of the lighting device of FIG. 1 ;

FIG. 6 is a left side elevational view of the lighting device of FIG. 1 ;

FIG. 7 is a rear elevational view of the lighting device of FIG. 1 ; and,

FIG. 8 is a left side elevational view of the lighting device of FIG. 1 , with a cover shown as environment.

The dash-dash-dash broken lines are included for the purpose of illustrating portions of the lighting device that form no part of the claimed design.