The ornamental design for a headlamp, as shown and described.
FIG. 1 is a perspective view of the headlamp as seen from the front, top, right side;
FIG. 2 is a top plan view of the headlamp of FIG. 1;
FIG. 3 is a front plan view of the headlamp of FIG. 1; and,
FIG. 4. is a right side elevational view of the headlamp of FIG. 1, the other side elevational view being a mirror image thereof.
Dense stippling, stippling of intermediate density, and sparse stippling are used in FIGS. 1-4. The dense stippling represents a surface having a color that contrasts with the color of the surface including the sparse stippling. The surface including the sparse stippling has a color that also contrasts with the surface that includes the stippling of intermediate density. The surface including the stippling of intermediate density can have the same color or a different color from the surface that includes the dense stippling.
The surfaces including stippling define the scope of the claimed design. The uniform broken line defines the perimeter of the surfaces including stippling and forms no part of the claimed design. The non-uniform broken lines showing the remainder of the headlamp are for illustrative purposes only and form no part of the claimed design.