Axiom Home Page Forums General Discussion Advice from Axiom Owners DLP getting dim?

I'd say they probably do, especially if it is a halogen cycle bulb. The halogen cycle is supposed to allow parts of the filament to atomize and move about the bulb and then be re-absorbed (very simplified explanation). But over time some of these particles build up on the inside glass and not as much light can pass through.

It may seem counter-intuitive, but running halogens below their proper operating temperature shortens their life, because they can not properly "cycle". So some of those bulb-saver settings aren't.