AVS Special Member
Join Date: Oct 2009
Location: Merillville, IN 46410
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Many variables come into effect. First, the gain of the screen,then how dark is your environment, and last how bright do you like your image. Movie theaters keep their brightness around 12 foot Lamberts. To me the brightest that I would watch a movie is between 16-18 foot lamberts. I keep my JVC at 13ftL and my Acer around 16ftL in my theater. However, I prefer to have lights on the majority of the time when I'm watching tv shows, sports, or gaming and I need 25-50ftL.
With a white matte screen at a gain of 1.1, the qumi will give you about 180 lumens on a 105in screen, giving you 6ftL, which I think is too dim. With the Optom ML500, you can get as much as 375 lumens, giving you 12.5ftL. Which is really good if your environment is dark. When I had my ML500, I used it on my 120 HP screen that was 2.4 gain. I probably got 1.8 gain from the screen, but I got really good brightness. It just wasn't as sharp as I hoped it was.