It happens to the best of us. You've just plunked down your hard-earned money to buy a dream home theater system, and you have to leave it. Maybe it's the vacation that, after months of planning, you suddenly want to cancel. Maybe it's the business trip you knew was coming and couldn't pawn off on a junior partner. Even worse, maybe your half-uncle, third removed, has passed on and left you his venomous-bee collection, which the terms of the will require you to pick up in person. Whatever the case may be, you're leaving, and your home theater is staying behind. Well, maybe not.

Bulbs are so 20th century. You can gussy them up, charge a bunch of money for them, even call them fancy names (lamps), but the fact of the matter is, they're still basically light bulbs. Almost all new RPTVs and front projectors use UHP (ultrahigh pressure) lamps to create light. These lamps are fairly efficient for the light they put out but are very hot, costly, and don't last very long. One new technology that's aiming to replace the UHP monopoly is LED, or light-emitting diode.