I have an art show starting up in the next week or so, and am curious about the possibility of using a projector to display an interactive program for the duration. Problem is that the show will last for the entire month of October, and I don't see how a projector bulb could last that long. Does anyone know if displaying a blank, black screen will help save the bulb over time? I might be able to rig an Arduino and a distance sensor to "wake up" the piece when someone walks by, then go back to black when they leave.