[Tapin]

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Does the power save feature increase the lamp longevity? Or do I need to fully power down, say, overnight?

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My understanding (I'm not a hardware guy, but I've got a number of friends who are who have told me this -- of course, they could be full of it, but I trust 'em) is this: The lamp has a finite (unknown) number of hours that it will stay lit. So the answer to your question is: Yes, if the monitor is in power-save mode, the lamp will be off and you'll be fine. If you tell the OS to never sleep the display (and you don't physically turn the monitor off), however, the lamp will always be active and therefore burn out much quicker.

As a side note, I was also told that varying the brightness doesn't matter -- that is, if you turn down the brightness to 80% of normal, you're not going to get 125% of the hours that the lamp would've given you at full brightness. Bummer.