The ornamental design for end portion of lighting fixture, as shown and described.
FIG. 1 is a bottom perspective view of an end portion of a lighting fixture showing my new design;
FIG. 2 is another bottom perspective view thereof;
FIG. 3 is an enlarged left end elevational view thereof, the right end being unornamented;
FIG. 4 is a bottom plan view thereof;
FIG. 5 is a front elevational view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a rear elongated view thereof.
The broken line representation of the body portion of a lighting fixture shown in FIGS. 1–7 is for illustrative purposes only, and forms no part of the claimed design.