The ornamental design for a lamp, as shown and described.
FIG. 1 is a front view of a design for a lamp according to the present invention.
FIG. 2 is a back view of the lamp of FIG. 1.
FIG. 3 is a top view of the lamp of FIG. 1.
FIG. 4 is a bottom view of the lamp of FIG. 1.
FIG. 5 is a right side view of the lamp of FIG. 1.
FIG. 6 is a left side view of the lamp of FIG. 1.
FIG. 7 is a top front perspective view of the lamp of FIG. 1; and,
FIG. 8 is a bottom left perspective view of the lamp of FIG. 1.
The solid lines in FIGS. 1-8 illustrate a lamp according to the present invention. In the drawings, the broken lines are for the purpose of illustrating environment only and form no part of the claimed design.