The ornamental design for a lightingstick, as shown and described.
FIG. 1 is a perspective view of a lighting stick showing our new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a left side view thereof;
FIG. 5 is a right side view thereof;
FIG. 6 is a top view thereof;
FIG. 7 is a bottom view thereof;
FIG. 8 is an enlarged view of FIG. 6;
FIG. 9 is an enlarged view of FIG. 7;
FIG. 10 is an operating state of the lighting stick with a hand-strap, wherein a binding location of the lighting stick and the hand-strap is the broken line portion shown in FIG. 7 or FIG. 9; and,
FIG. 11 is a perspective view of the lighting stick in an exemplary environment.
The broken line portions of the lighting stick in FIGS. 1-11 represent unclaimed portions of the claimed design and form no part thereof.