Originally Posted by kesava.chunduri
Are you aware of any good gray screens in that range? Coz, my installer highly recommended to get a Gray screen with 1.5-2 Gain.
This is why i first asked you if you're putting the screen in a living room or a theater room.
The purpose of a gray screen is to help preserve a projector's black level in a less than ideal environment like a living room, or to help with contrast from projectors with poor black levels, or both.
The purpose of a high gain screen is to amplify the light output of a projector to overcome the washout effect from ambient light.
A high gain gray screen will do all three of these things.
In a room with light walls and ambient light (like a family living room), such a screen makes it possible to get a satisfactory picture where a low gain white screen would give an unwatchable picture.
All of the great things a high gain gray screen can do in a room with poor light control, are exactly the things you don't want a screen to do in a dedicated theater room.
In a dedicated theater room, your projector may need only half, or even a third of the amount of light output it would need in a lighted room. So a screen that amplifies the projector's light output 50-100 percent (1.5-2.0 gain) would be uncomfortably bright. Plus the elements of the screen that gives it a high gain (like nano mirrors or glass beads) will produce a sparkling effect during a bright scene that calls attention to itself to a much greater degree in such a dark room.
Also, a high gain screen works by concentrating light towards the center of the screen. The higher the gain, the more light you get at the center of the screen, and the less light you get at the sides of the screen. So your ideal seating position is at dead center of the screen, while other people sitting at the sides will get a dimmer picture.
In a dedicated theater room, the room can get so dark the gray color of the screen does very little to help with contrast because even a white screen can get as dark as needed. Also, a gray screen will give you duller whites compared to a white screen.
For these reasons, i wouldn't recommend a high gain gray screen for a dedicated theater.
However, some people's definition of a theater room may be a room for the purpose of using the projector, but still does not truly qualify as a dedicated home theater. If that's the situation you're in, then it will explain why your installer advised you to go with a high gain gray screen.