Re: Projector choices
Look for some label or markings that tell you who the manufacturer is. Since it's an electric screen, there is likely to be a model and serial number noted somewhere. Contact the manufacturer to see if they have a record of which material was used and what the gain is. If the gain is relatively high, you can get a brighter image from a cheap projector in a seriously compromised viewing environment such as yours.
Since your ceiling and upper walls are white, you will not be able to achieve very good blacks, color saturation, or contrast in the image. The screen itself will be a large light source in the room whenever an image is being projected on it. Therefore, light from the screen will shine on the walls and ceiling, bounce back onto the screen, and this reflected light will contaminate the image on the screen.
If you don't want to change the colors of your ceiling and walls to something much darker, I recommend that you seriously consider selling the screen on ebay, then purchase the largest rear projection TV you can afford. You will get a much better picture that way.
If you don't care much about image quality, and just want something big to fill your screen, go ahead and get the brightest projector you can afford. Try ProjectorCentral.com to do a search. You won't need to be distracted by manufacturer's claims about superior contrast ratio performance, because your screen is likely too large to achieve a very bright image, and room conditions will prevent the image from producing sufficient blacks.
Best regards and beautiful pictures,
G. Alan Brown, President
CinemaQuest, Inc.
A Lion AV Consultants Affiliate
"Advancing the art and science of electronic imaging"
