Projection Lamp

FIG. 1 is a front, right, top perspective view of a projection lamp showing my new design; FIG. 2 is a back, left, bottom perspective view thereof; FIG. 3 is a front view thereof; FIG. 4 is a back view thereof; FIG. 5 is a left view thereof; FIG. 6 is a right view thereof; FIG. 7 is a top view thereof; and, FIG. 8 is a bottom view thereof. The broken lines shown on the drawings depict portions of the projection lamp that form no part of the claimed design.