Stirrup for lighting fixture

FIG. 1 is a right top perspective view of the stirrup for lighting fixture;

FIG. 2 is a left side elevation view thereof, the opposite side being the same;

FIG. 3 is a front end elevation view thereof, the opposite side being the same;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a bottom plan view thereof.

The broken line shown is included for the purpose of illustration only and forms no part of the claimed design.