The ornamental design for a lightingfixture, as shown and described.
FIG. 1 is a perspective view of a lighting fixture showing the new design. Excluding the lamp supports, this fixture has three-way, one hundred twenty degree overall rotational symmetry. The canopy and glasses each have a circular horizontal cross-section.
FIG. 2 is an enlarged fragmentary side elevation view thereof, with the upper portion of the lamp being omitted for illustrative purposes only; and,
FIG. 3 is a top plan view thereof, shown with the lamps spread apart and surrounding the canopy to more clearly illustrate the upper surfaces of the lamps.
The broken lines shown on the drawings depict portions of the lighting fixture that form no part of the claimed design.