For example, the image produced by a projector that is projecting onto a 1 square meter screen is ten times brighter than if the same projector – with the same lumen value – is projecting the image onto a 10 square meter screen. And since a projector’s light reflects off a surface, the size of that surface affects the brightness of the final image. But is knowing a projector’s lumens value alone useful when making a purchase? To answer this question, one must take a deeper dive into what lumens means.Īs described above lumen only measures the total light output of a projector, but this by itself is not entirely useful because it does not take into account the reality that the viewer’s eyes are not directed at the lamp itself but at the surface that the projector’s light is being projected on (e.g. Brightness on Screen (Nits)Īnyone who has looked into projectors on the market knows that lumens is the main unit of brightness that is used in a projector’s product specification. Founded in 1918, the Institute works in close collaboration with stakeholders from industry and government to identify and develop standards- and conformance-based solutions to national and global priorities. voluntary standards and conformity assessment system. The American National Standards Institute (ANSI) is a private, non-profit organization that administers and coordinates the U.S. Difference Between Lumen and ANSI Lumen.
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