The ornamental design for a lightingfixture, as shown and described.
FIG. 1 is a top perspective view of a lighting fixture showing the new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a back elevational view thereof.
FIG. 4 is a right side elevational view thereof;
FIG. 5 is a left side elevational view thereof;
FIG. 6 is a top plan view thereof;
FIG. 7 is a bottom plan view thereof; and,
FIG. 8 is a top-rear perspective view thereof.
The vertical broken line in FIGS. 4 and 5, and the horizontal broken line in FIGS. 6 and 7 represent environment that forms no part of the claimed design. The broken lines in FIGS. 3 and 8 represent the rear surface of the wall mount which forms no part of the claimed design.