The ornamental design for a lightfixture, as shown and described.
FIG. 1 is a bottom perspective view of a light fixture in accordance with my design, illustrating a movable portion in a preferred position;
FIG. 2 is a side elevation view of the light fixture in accordance with my design, the opposite side being a mirror image of that shown, illustrating a movable portion in a preferred position;
FIG. 3 is a front elevation view of the light fixture in accordance with my design, illustrating a movable portion in a preferred position;
FIG. 4 is a back elevation view of the light fixture in accordance with my design, illustrating a movable portion in a preferred position;
FIG. 5 is a top plan view of the light fixture in accordance with my design, illustrating a movable portion in a preferred position; and,
FIG. 6 is a bottom plan view of the light fixture in accordance with my design, illustrating a movable portion in a preferred position.
The areas bounded by broken lines in FIGS. 5 and 6 form no part of the claimed design.