Originally Posted by MississippiMan
The Poster was using a 3000 lumen PJ on a 100" diagonal Screen, and even with just 0.7 gain was getting 35 fl.
Hi MM, could you please walk me through how to get those numbers? If you were using projector central's calculator I'd have to clarify a few things.
I know Optoma lists the HD141x at 3000lm peak white light output, but ProjectorCentral measured it (they have all the gizmos to measure it, I'm not sure how I would verify it) at slightly over 1000lm of colored light. I've actually been kinda looking forward to exhausting the lamp hours so I can upgrade to a higher lumen PJ :P They say some Epsons have higher lumen/lower contrast, which I think might be an acceptable tradeoff with this setup.
More importantly, I'll shamefully admit that I previously had the projector mounted to get a 120" image on the white wall, and I've been too lazy to drill new holes on the ceiling to bring it to the appropriate position for this 100" screen, so for all my examples I was just cropping the image with the PJ's software. Light output should be slightly higher one I bring it closer, but maybe also the hotspotting, we'll see. But then again, I've been lazy/otherwise occupied. So for all my examples please consider it as a "cropped" 120" image, as the PJ is in fact mounted at exactly 4m from the wall.
Also I'm sitting at about 1300 lamp hours on bright mode (Eco mode is too dark with this screen). A brand new PJ would give better results
Sorry I didn't make these disclaimers from the start, as I was just casually posting my results, but if they are going to be used as a reference for future comparison, we might as well get the numbers right.