FIG. 1 is a bottom perspective view of a portion of a lighting fixture showing our new design;

FIG. 2 is another bottom perspective view thereof with the end cap and end shield shown in broken lines removed;

FIG. 3 is bottom plan view thereof;

FIG. 4 is a side elevational view thereof, the other side being a mirror image;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is an enlarged cross-sectional view thereof taken long lines 6—6 in FIG. 4.

FIGS. 1-5 are broken away to indicate indeterminate length. The broken lines shown in FIGS. 1-6 are for illustrative purposes only and form no part of our claimed design. The broken lines in FIG. 5 also represent the bounds of the claimed design; the regions within these broken lines form no part of our claimed design.