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Join Date: Dec 2006
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Sweet spots can vary a bit. I have seen a tiny bit of CA introduced on these DLP's when you are at or near closest throw, but it's not a huge amount. I would mount it wherever you think is best, mid-zoom should be fine. You can get a little bit more native contrast (darker blacks) by mounting it farther back, but then you lose some lumens, so have to decide on what trade-off you need. I don't think on this projector sharpness is too big of a concern even at closest throw, it's already so sharp, but it can help a little to back off a bit.
The last question on brightness is going to completely depend on how your lamp has aged, screen size, etc...
Eventually most of us have to put the lamp in high around 1000-1500 hours, and some may also have to enable BC and/or Sports Mode. However, if you have a smaller screen or a high gain screen, then you might make it even longer.