Originally Posted by coldmachine
I thought you were being specific to the 1080.
Other than the HT5000 (previously discussed)I will always replace lamps, at least until the technology changes, around the 500hr mark.
I see no reason to do this with a C3X (either the 720 or the 1080) In my case, as I said, I'm getting 650 calibrated lumens after 875hrs. This still produces well over 20 ftL on my 1.3 gain 110" diagonal screen. As long as I keep it calibrated over time, I see no need to replace the lamp. If I put a new lamp in, I'll have to resort to using a ND filter again.
Also, with the Lumagen RadianceXD color management feature, I am able to correct for the over-saturated colors of my C3X 720 to achieve virtually perfect primaries and secondaries x,y and Y.
I'm going to wait until the lamp blows, then put my backup back in play.
There's nothing wrong with replacing the lamp at 500hrs, but I'm too frugal to do that.