Illumination device

FIG. 1 is a front, top and right side perspective view of an illumination device showing our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a rear elevational view thereof;

FIG. 8 is an additional front, top and right side perspective view thereof; and,

FIG. 9 is a front, top and right perspective view thereof with the cover shown in a lifted position.

The broken line disclosure represents portions of the article and environmental structure which form no part of the claimed design.