This question is particularly aimed for information on the Z4 lamp, since that's the projector that I have, but really, any information on lamp life will be welcomed. I read that the Z4 lamp will last 2,000 hours, which I assumed would be in the full-power mode. Right now, I have it set to "half-lamp" (only using half-power). Does that mean that instead of lasting 2,000 hours, the lamp will now last 4,000 hours? Does anyone know? Have any of your lamps, from any of your projectors, lasted twice the length they were supposed to, because you set them to "low" power modes?