I claim the ornamental design for a lighting fixture, as shown and described.
FIG. 1 is a side perspective view of a lighting fixture. This fixture has mirror image symmetry (one hundred eighty degree overall rotational symmetry, and mirror image symmetry along a first vertical imaginary plane and also mirror image symmetry along a second vertical imaginary plane, with the first and second vertical imaginary planes being orthogonal to each other). The glasses, lamp bases, and frame apertures each have a circular horizontal cross-section.
FIG. 2 is a front elevational view of the lighting fixture of FIG. 1.
FIG. 3 is a right side elevational view of the lighting fixture of FIG. 1; and,
FIG. 4 is a top plan view of the lighting fixture of FIG. 1.
The broken lines shown in the drawings depict portions of the lighting fixture that form no part of the claimed design.