The ornamental design for a handle for a lightingfixture, as shown and described.
FIG. 1 is a first perspective view of a handle for a lighting fixture showing my new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a left side elevational view thereof, the right side elevational view being a mirror image;
FIG. 5 is a top plan view thereof; and
FIG. 6 is a bottom plan view thereof; and,
FIG. 7 is a second perspective view thereof.
The broken lines showing elements of the handle for a lighting fixture in FIGS. 1-6 form no part of the claimed design. The elements represented by the broken lines in FIGS. 1-6 may not be visible during normal use. The broken lines showing elements of the lighting fixture in FIG. 7 form no part of the claimed design.