The ornamental design for a lighterhead, as shown and described.
FIG. 1 is a perspective view of the lighter head showing our new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a right side view thereof;
FIG. 5 is a left side view thereof;
FIG. 6 is a top plan view thereof;
FIG. 7 is a bottom plan view thereof; and,
FIG. 8 is a perspective view of the lighter head shown in its possible environment.
In the drawings, the broken lines are for the purpose of illustrating environmental subject matter only and form no part of the claimed invention. The surface shading illustrated in the drawings is provided merely to highlight the contour of the design; it is not intended to be illustrative of texture or gloss.