The ornamental design for an exitlightbulb, as shown and described.
FIG. 1 is a perspective side view of the exit light bulb of the present
invention, with the broken line showing for illustrative purposes only and
forming no part of the claimed design;
FIG. 2 is a plan view of the exit light bulb of FIG. 1;
FIG. 3 is a side view of the exit light bulb of FIG. 1;
FIG. 4 is an end view showing the screw shell end of the exit light bulb of
FIG. 1, as seen from the top of FIG. 1; and,
FIG. 5 is an end view of the exit light bulb of FIG. 1, as seen from the
bottom of FIG. 1.