![]() ![]() ![]() Projector lamps dim with age (even LED lamped models), most significantly within the first few hundred hours for non-LED lamped models. The solution, short of setting up and measuring actual screen brightness? Over-build the system. If you are planning a CinemaScope aspect ratio screen, additional factors can affect final achieved screen brightness. Varying distance from the screen to the projector lens can also affect screen brightness. Also, claimed screen gain spec from manufacturers is also not a reliable metric. ![]() However, it's not that simple, since claimed projector maximum lumens is not a reliable metric, due to many factors. The theoretical formula for calculating screen brightness in a preliminary design is: claimed projector lumens divided by screen square footage x screen gain = foot Lamberts. The SMPTE recommendation for commercial cinemas is 12 to 16 fL. The IMAX site doesn't give much on specifications. After prowling around on web search results, the only mention of screen brightness I found for IMAX was from a forum post- 11 foot Lamberts. ![]()
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