None: Half of the fans will refuse to admit the old light bulb is burnt out and will angrily prevent the others from having it replaced because they know that having a dark room means they can easily -blam!- the other people. In the end Respawn replaces the light bulbs but it doesn't matter because as it turns the socket got -blam!-ed up and broken at some point after they first tested it and nobody wanted to believe it when the alpha tester first told them it was broken.