AVS Forum Special Member
Join Date: Aug 1999
Location: Kemptville, Ontario, Canada
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It will tell you when the bulb needs to be changed. Generally it's around 2,000 hours but is longer if you use econo mode.
Of course, replacing the bulb early will give you a huge increase in brightness. My testing on an AE4000 showed a new bulb was 2 1/2 times brighter than a 2,000 bulb.