The ornamental design for a solarlamp, as shown and described.
FIG. 1 is a perspective view of a solar lamp showing my new design;
FIG. 2 is another perspective view thereof;
FIG. 3 is a front view thereof;
FIG. 4 is a rear view thereof;
FIG. 5 is a left side view thereof;
FIG. 6 is a right side view thereof;
FIG. 7 is a top view thereof; and,
FIG. 8 is a bottom view thereof.
The broken lines showing in the views are for the purpose of illustrating unclaimed subject matter only and form no part of the claimed design. The oblique line shading shown in the drawings indicates a transparent or translucent surface. Internal structure of the transparent or translucent surface is omitted. No claim is made to any element inside the transparent or translucent surface.