The ornamental design for stage lighting, as shown and described.
FIG. 1 is a perspective view of stage lighting showing our new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a top plan view thereof;
FIG. 4 is a bottom plan view thereof;
FIG. 5 is a side elevational view of one side thereof;
FIG. 6 is a side elevational view of the opposite side thereof; and,
FIG. 7 is a rear perspective view thereof.
The boundary of the claim is defined by the discontinuation of shading and the change from solid line to broken line along the top, bottom and sides of the illustrated stage lighting. The broken line showing forms no part of the claimed design.