The ornamental design for a lighting apparatus, as shown and described.
FIG. 1 is a perspective view of a lighting apparatus showing our new design;
FIG. 2 is a top plan view thereof;
FIG. 3 is a bottom plan view thereof;
FIG. 4 is a side elevational view thereof; and,
FIG. 5 is a cross-sectional view thereof, taken along line 5—5 of FIG. 2.
The broken-line disclosure in the views is understood to represent portions of the article in which the claimed design is embodied, but which form no part of the claimed design.