Originally Posted by rlarsen462
My X990 is arriving today, however my room is nowhere near complete unfortunately and I currently have no screen.
I am going to use a 135" EPV Peregrine eFinity ISF screen (1.25 gain) and my throw distance is going to be about 15-16ft...am I going to be hosed for HDR brightness? I can't find a single review on this screen but it's been recommended to me by a couple folks now, including the dealer.
You didn't say if your screen is academy or scope (widescreen) however I'm going to assume you meant the former as it's far more common.
That puts you at about 61 sq ft, rounded off, of total screen area.
Quick and dirty/back of napkin calcs: Assume after basic calibration, using the no-filter HDR color mode on the PJ, and at a 15 ft throw, you get 1600 lumens. There are other factors like if you use DI, manual iris, etc. but let's not overly complicate this back of the napkin calculation for the moment. 1600 is probably best case if previous models are any guide.
1600/61=26.2 ftL x 1.25 (screen gain) = 32.75 ftL. In theory you'd be over the threshold for decent PJ HDR. However you're on the edge and a lot of factors can affect it:
Is the screen truly 1.25 gain (in practice many screens don't quite meet the same gain they are advertised at).
The real-world lumens you actually get when everything is mounted. 15 ft sounds like close the minimum throw you'd need to fill a 135'' 16x9 screen so you wouldn't be at the max telephoto end, which is good, but what your calibrated brightness comes out to is tbd
. If it's 1500 (or 1700) it doesn't matter much but if you drop to 1200 you have HDR problems.
Whether you use the color filter or not for additional coverage. I believe it cuts lumens by 10% or so. The new JVCs have an HDR mode that uses it with and without - with that much screen to cover I'd say, without.
The x9900 has advertised lumens of 2100 however I don't know if the calibrated lumens folks are getting in the real world come close to that, with previous models they tended to drop a decent amount:
The previous gen, you would see around 1300-1400 in "HDR" or "Cinema" mode w/high lamp (you'll want to use high lamp for HDR content regardless). However the new JVCs have two new HDR modes, one with filter and one without, so I don't know what it comes out to. Hence I just assumed a baseline of 1600, without filter, in HDR mode since these are supposed to bit a bit brighter.
Bottom line is 135'' is a lot of screen to light up for HDR, though for SDR you'll be perfectly fine. You might be ok with HDR however if it looks a little "dim" consider stripping the metadata ala Oppo, Integral, etc. instead. Plenty of threads around the forums on that and sure to be many in the owners thread for these PJ models as well