The ornamental design for a lighted displaybase, as shown and described.
FIG. 1 is a front perspective view of a display base showing my new design;
FIG. 2 is another front perspective view;
FIG. 3 is a top view thereof;
FIG. 4 is a rear elevation view thereof; and,
FIG. 5 is a right side elevation view, the left side elevation view being a mirror image thereof.
The broken lines shown in FIG. 1 illustrate portions of the lighted display base and environmental structure that form no part of the claimed design. The broken lines shown in FIGS. 2-5 illustrate portions of the lighted display base that form no part of the claimed design. The bottom view (not shown) forms no part of the claimed design.