The ornamental design for a lightfixture, as shown and described.
FIG. 1 is a side elevation view of the light fixture showing my new design, with all four sides being identical to that shown;
FIG. 2 is a bottom perspective view of the light fixture shown in FIG. 1.
FIG. 3 is a bottom plan view of the light fixture shown in FIG. 1.
FIG. 4 is a bottom perspective view of the light fixture showing a second embodiment of my new design wherein the side elevations are identical to the first embodiment; and,
FIG. 5 is a bottom plan view of the light fixture shown in FIG. 4.
Except for the four protruding ribs, the top surface of the light fixture that is not shown forms no part of the claim. The broken lines are included to depict environment only and also form no part of the claim.