Thursday, Aug. 28, 2008 -How many Clay Center employees does it take to change a light bulb? Four, according to ElectricSky Theater manager William Rouse. When the 7,000-kilowatt bulb blew out recently on the Mega Systems 870 Motion Picture Projector in the theater, Rouse said he needed one person to take off the lens of the 70mm projector, one to operate the projector, one to change the bulb and one to stand around just in case. When the bulb costs $1,200, Rouse said, it's good to have help.