The ornamental design for a “lighting fixture,” as shown and described.
FIG. 1 is a perspective view showing my design;
FIG. 2 is a second perspective view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a front elevational view thereof;
FIG. 5 is a left side elevational view thereof;
FIG. 6 is a bottom plan view thereof;
FIG. 7 is a top plan view thereof;
FIG. 8 is a right side elevational view thereof;
FIG. 9 is a third perspective view thereof; and,
FIG. 10 is a fourth perspective view thereof.
The Luminaire of the present invention may be coupled with one or more power cables or brackets which are depicted in broken lines and form no part of the design.