Headlamp

FIG. 1 is a front perspective view of a headlamp in a first position of use, showing our new design; FIG. 2 is a front view thereof; FIG. 3 is a right side view thereof; FIG. 4 is a left side view thereof; FIG. 5 is a top view thereof; FIG. 6 is a bottom view thereof; FIG. 7 is a front perspective view of the headlamp in a second position of use; FIG. 8 is a front view thereof; FIG. 9 is a right side view thereof; FIG. 10 is a left side view thereof; FIG. 11 is a top view thereof; and, FIG. 12 is a bottom view thereof. The broken lines in the drawings depict portions of the headlamp that form no part of the claimed design.