The ornamental design for a solarlamp, as shown and described.
FIG. 1 is a first perspective view of a solar lamp showing my new design;
FIG. 2 is a second perspective view thereof;
FIG. 3 is a front elevational view thereof;
FIG. 4 is a rear elevational view thereof;
FIG. 5 is a left side view thereof;
FIG. 6 is a right side view thereof;
FIG. 7 is a top plan view thereof; and,
FIG. 8 is a bottom plan view thereof.
The broken lines in the drawings illustrate portions of the solar lamp which form no part of the claimed design. The diagonal lines indicate transparency.