We claim the ornamental design for a fluorescent lamp, as shown and described.
FIG. 1 is a front side plan view of a fluorescent lamp in accordance with the present design;
FIG. 2 is a rear side plan view of the fluorescent lamp of FIG. 1;
FIG. 3 is a left side plan view of the fluorescent lamp of FIG. 1;
FIG. 4 is a right side plan view of the fluorescent lamp of FIG. 1;
FIG. 5 is a top plan view of the fluorescent lamp of FIG. 1;
FIG. 6 is a bottom plan view of the fluorescent lamp of FIG. 1;
FIG. 7 is a front, upper perspective view of the fluorescent lamp of FIG. 1; and,
FIG. 8 is a rear, lower perspective view of the fluorescent lamp of FIG. 1.
The fluorescent lamp is shown with symbolic break lines. The appearance of any portion of the article between the break lines forms no part of the claimed design.