We claim the ornamental design for a light unit, as shown and described.
FIG. 1 shows an upper perspective view of an embodiment of the light unit;
FIG. 2 shows a top plan view thereof;
FIG. 3 shows a detailed view of the region identified by the bracket in FIG. 2;
FIG. 4 shows a bottom plan view thereof;
FIG. 5 shows a front elevation view thereof (the rear elevation view being the same);
FIG. 6 shows a left elevation view thereof (the right elevation view being the same);
FIG. 7 shows a detailed view of the region identified by the bracket in FIG. 5;
FIG. 8 shows a bottom plan view of a second embodiment thereof;
FIG. 9 shows a front elevation view of FIG. 8 (the rear elevation view being the same);
FIG. 10 shows a left elevation view of FIG. 8 (the right elevation view being the same); and,
FIG. 11 shows a detailed view of the region identified by the bracket in FIG. 9.
The alternating short-long broken lines (e.g., proximate the bracket in FIG. 1) are symbolic boundary lines representing bounds of the claimed design; all other broken lines illustrate portions of the light unit that form no part of the claimed design. Absent a statement otherwise, portions of the article not shown form no part of the claimed design.