The ornamental design for a projectionlamp, as shown and described.
FIG. 1 is a front perspective view of a projection lamp, showing my new design;
FIG. 2 is a rear 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 plan view thereof;
FIG. 8 is a bottom plan view thereof; and,
FIG. 9 is an enlarged detail view of the portion indicated by the number 9 in FIG. 2.
The dash-dash broken lines depict portions of the projection lamp that form no part of the claimed design. The dot-dash broken lines in FIGS. 2 and 9 denote the boundary of the enlarged detail view and form no part of the claimed design.