![]() ![]() Under most room lighting designs, there will be considerably less ambient light on the screen wall than directly over viewing area. Typically, a projection system calculator will take into account ambient light on the screen wall and also ambient light directly over the viewing area. When screen size is increased, screen gain is reduced, and/or ambient light is present, then projector lumens must be increased to maintain a pleasing screen image.įoot Candle units are employed to measure the amount of ambient light falling directly on a particular area. Lumens are used to measure a projector's peak light output. ![]() A new fresh plasma will have an output of approximately 40 to 45 foot lamberts and is normally viewed with some room lights present. A quality movie theater will have a screen brightness of 12 to 16 ft. Common input to such models includes the following:įoot lambert units are used to measure screen image brightness. To facilitate use of calculators, designers should fully understand the terms touched on previously in this article as well as how to conduct basic measurements. ![]()
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