FIG. 1 is a perspective view of a projection lamp showing my new design;
FIG. 2 is another 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 elevational view thereof;
FIG. 6 is a right side elevational view thereof;
FIG. 7 is a top plan view thereof;
FIG. 8 is a bottom plan view thereof;
FIG. 9 is an exploded perspective view of the projection lamp;
FIG. 10 is a perspective view of the projection lamp with additional broken line environment;
FIG. 11 is an exploded perspective view thereof;
FIG. 12 is an enlarged view of portion 12 shown in FIG. 2; and,
FIG. 13 is an enlarged view of portion 13 shown in FIG. 2.
The even length broken lines depict portions of the projection lamp that form no part of the claimed design. In addition, the dot-dash broken lines illustrate enlarged portions of the design. None of the broken lines form part of the claimed design.