The ornamental design for a fluorescentlamp, as shown and described.
FIG. 1 is a top view of a fluorescent lamp of the present invention;
FIG. 2 is a front view thereof, wherein the rear view is a mirror image thereof;
FIG. 3 is a bottom view thereof; and,
FIG. 4 is a right side view thereof, wherein the left side view is a mirror image thereof.
The ornamental design which is claimed is shown in solid lines in the drawings. Any broken lines in the drawings are for illustrative purposes only and form no part of the claimed design.