The ornamental design for a projectionlamp, as shown and described.
FIG. 1 is a front perspective view of the projection lamp showing my new design.
FIG. 2 is a front view of the projection lamp.
FIG. 3 is a rear view of the projection lamp.
FIG. 4 is a left side view of the projection lamp.
FIG. 5 is a right side view of the projection lamp.
FIG. 6 is a top view of the projection lamp.
FIG. 7 is a bottom view of the projection lamp.
FIG. 8 is a rear perspective view of the projection lamp.
FIG. 9 is an enlarged view of the FIG. 2; and,
FIG. 10 is an enlarged view of the FIG. 4.
Any shading and cross-hatching are not features of the design but are utilized to illustrate the surface contours of the projection lamp design in the drawings.