We claim the ornamental design for a lamp, as shown and described.
FIG. 1 is a perspective view of the lamp of my new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a side elevational view thereof, all other side views are identical;
FIG. 5 is a top plan view thereof; and,
FIG. 6 is a bottom plan view thereof.
Features shown in broken lines in the drawings are not part of the claim.
The broken line showing of a fluorescent light bulb and end tabs are included for the purpose of illustrating environmental structure and forms no part of the claimed design.