What type of lamps are used in today’s projectors?

Almost all business and home theater projectors rely on lamps that use mercury. We’ll call them UHP lamps, but they are mercury vapor lamps. They are basically a cousin of the mercury vapor lamps used in street lights. When you read about the lamps in projectors, though, you’ll see them called UHP (ultra high pressure), or any of a half dozen plus acronyms. Trying to tell them apart by the different names, is mostly a waste of time. UHP, UHM, NSH, UHE, etc, are the same thing, in almost all cases. Eg. A Sanyo projector lamp, in its custom holder.