It's going to be an 8,5 foot wide 2.35 screen. As you say, at that size, most projectors are going to produce a bright enough image for the lower gain to not be a problem. If I have to reduce the lumens down to get to an image brightness I like (around 12fL or less), then I can use an ND filter, and remove it later for 3D if necessary - but 3D isn't something that I'm overly into..
I think the only concern may be the detail level, but with moving video, it's less noticeable. Those using Spandex don't seem to have any issues with detail, or at least don't seem to say much about that, so with the UF being a step up, it doesn't look like it's going to be a big issue for most people who need to sit closer and can see the weave of the XD. In which case you have to pick your poison - slightly noticeable weave on brighter scenes, or slightly softer image which may or may not be noticeable during a movie.
Originally Posted by elmalloc
Who says Cameron is "right" and why do we care about him so much - lol!
I trust Gary Lightfoot more than James Cameron.