Originally Posted by bwillcox
Thanks for the response and the link (looks pretty useful), but I was hoping for something simpler than that. I see references to the various hits values with my UB9000 player for its optimiser and was hoping to be able to relate those values (e.g., 350 nits, 500 nits, etc.) to what the NX7 is capable of. I suspect that it's not all that simple, but even a ball-park value for the setting would help.
From a fact-of-life perspective, Dominic Chan answered your question related to matching your UB9000 to your RS2000.
However, back to your initial question of what is a nit and how does it relate to your projector and screen. I will quickly highlight some points:
1st: 1 nit is equal to .292 foot lamberts, or 100 nits = 29.2 FtL. If I remember correctly, commercial theater standards for HDR is 100 nits to 108 nits, or ~29-31 FtL. Hence, why many people try to get ~30 FtL or more for HDR on their front projection system.
2nd: after calibration, a lot of RS1000/2000 projectors are getting in the area of just over 1500 lumens (from what I've seen thus far, although some appear to get less). But that is using the full 17:9 panel, on a 16:9 picture you can expect a drop of 6%-7% of light output from the projector.
3rd: So, for a quick calculation on a 1.0 gain screen, 100" diagonal 16:9 format, minimum throw, on a high lamp mode with iris at 0 and P3 filter not set: (1500 lumens x .935 (light output for 16:9 panel) x 1.0 (screen gain)) / 29.6 sf (sf of screen) = 47 FtL.
So, in theory, the person in the above example could use the 47 FtL (or ~160 nits) for HDR. Some people will do that, others will set their iris, P3 filter, maybe lamp mode, etc. to get closer to the 30 FtL standard (e.g., the black floor is lower at 30 FtL vs 47 FtL).
I hope this helps.