AVS Club Gold
Join Date: Nov 2002
Location: Byhalia, Mississippi. Waaaay down in the Bottoms
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Ya know....from your stated desires and dictates, using a good quality, bright white Base paint with a N8.0 Gray, applied via Sprayer onto a smooth substrate is about the only "sure thing". And even that might be adversely affected by the 18' throw. With the 8500ub, and with a unity gain surface you wind up with 22 fls. More than enough with a 1.0 gain surface. Not so much if your screen's reflectivity drops into the 0.9-0.8 gain range. One thing in your favor is that with such a long throw and a relatively small screen, uniformity of brightness across the Screen's surface should be easier to maintain with the PJ/screen combo that you'll have.
Should be........, for Lamp brightness and the condition of your organic LCD panels might play a overly important part in everything.
The Sherwin Williams ProClassic paint as mentioned in the "Build a Screen for under $100.00" article in Projector Central is a good paint to consider, especially if you cannot spray.. Choose a neutral Gray from the several applicable choices on the "Guide to Simple DIY Screens" sticky (2nd page) and apply with care. But be advised that whenever you use a shade of Gray that is dark enough to really affect (ie: improve on several aspects of IQ...) your end results, at least a small amount of recalibration to that Gray is necessary. usually very little though....and mostly centered around Gamma adjustments, not the Color palette.
To quote James T. Kirk;
"I'm laughing at the superior intellect"