Originally Posted by Kelvin1965S
I'm at 220 hours now and only about 5% drop from new (and that's calibrated too). In fact sometimes if I have it on for 5-6 hours the output seems to go up a little bit more so it's virtually back up to my new reading.
I use a Tecpel 531 lux meter to check my output at the screen (facing the projector).
When you get a chance Kelvin, could you see what happens if you do the following?
1) Use low lamp for an hour to warm up and take a reading
2) Go to high bulb and leave it for 15 minutes
3) Go back to low lamp and take a reading
4) Wait 10 minutes and take a reading
I found after using high lamp and going back to low, that low lamp does not return to its previous output level. Over a period of 10 minutes or so it gradually returns although it often then seems to stay a tiny bit lower than prior.
Also, I found that if I play 3D material in high lamp for about 15-20 minutes and then go back to 2D and take a reading of max white (on the X75 this is colourspace off, high bulb, aperture 0) I can get the highest reading from the projector (just over 1200 lumens on my X75). I actually saw this with the X70 as well. I never understood why playing 3D seems to give you a high lumens output when you go back to 2D, but it shifts about 60-70 lumens doing this technique.