the barman says "Oi - get out! We don't want your type in here"
or
None. The darkness will cause the bulb to change by itself.
or
None, because people who glow in the dark don't need light bulbs.
Note: Topical to the Chernobyl Reactor disaster of 1984.
or
Executive Producers don't screw in a light bulb, they screw in a hot tub.
or