The ornamental design for a lamp, substantially as shown and described.
FIG. 1 is a front perspective view of the lamp showing my new design as
embodied in a table lamp;
FIG. 2 is a rear elevational view thereof;
FIG. 3 is a front perspective view of a second embodiment of my new design
as embodied in a floor lamp;
FIG. 4 is a rear elevational view thereof;
The perforation in the circular light emitting panel in both embodiments
are partially shown for convenience of illustration, it being understood
that the perforations are uniformally continuous over each panel.