The HX1 lamp is rated for a nominal 2000 hours at which time your projector will likely be putting out about half it's rated light output...change it when you feel like the loss of brightness offsets the $500 replacement cost...and keep it as a spare in case you have a premature failure.
Uh, yeah, the veritable 'silver lining to every cloud' concept.
Actually, that would be a viable if somewhat cumbersome way of dealing with mixed lighting situations in your theater...new lamp for more casual viewing, sports or off-air general material, old lamp for watching movies in a dark theater environment. As long as you are not seeing any flicker from the older lamp, run it right up to the 2K mark or maybe higher.
There is probably some danger in running NSH or UHP type lamps beyond that level...I do get the feeling, although I don't have hard data, that they are a little more explosion prone than Xenon when run for extended periods.
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