Join Date: Mar 1999
Location: Redondo Beach, CA, USA
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If you want to watch during the day, you're going to need to do something about the windows. You could install roller shades; get the thickest opaque variety. It's been awhile, but I think I spent around $30 a window. We've since installed nice window treatments that look better and block the light more effectively (they have a reflective inner layer), but those black-out roller shades did pretty well.
A screen that copes with ambient light would be a good idea; DNP Supernova, Screen Innovations Black Diamond, and Stewart Firehawk seem to be the best in breed, but there may be other less expensive options out there that folks here can suggest.
My projector is supposedly a 2500 lumens machine (SIM2 C3X-E), and it's done pretty well on a 100" Dalite High Contrast Cinema Vision. But I'd still like better perfomance during the day, so I'm looking at DNP and SI in particular. If you do much daytime viewing I think 120" might be pushing it. Keep in mind that if you get your projector calibrated for best gamma and color perfomance, you're likely to get significantly lower than 2800 lumen output, and in any event as the bulb ages you'll lose brightness.