The ornamental design for a lightfixture, as shown and described.
FIG. 1 is a front perspective view of a light fixture according to a first embodiment;
FIG. 2 is a front view thereof;
FIG. 3 is a back view thereof;
FIG. 4 is a left side view thereof;
FIG. 5 is a right side view thereof;
FIG. 6 is a top view thereof; and
FIG. 7 is a bottom view thereof.
FIG. 8 is a front perspective view of a light fixture according to a second embodiment;
FIG. 9 is a front view thereof;
FIG. 10 is a top view thereof; and,
FIG. 11 is a bottom view thereof.
The right side view, left side view, and rear view of the second embodiment are substantially identical to the front view of the second embodiment. The dashed lines in the figures illustrate alternative mounting devices for the light fixture and form no part of the claimed design.