What is a Lumen?

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A lumen is a measure of the quantity of light emitted from a constant light source across one square meter. It symbol is lm.

A lumen describe how much light is contained in a certain area. The lumen is part of a group of standard measurements known as the photometry group, which measure different aspects of light.

Lumens are the most common measurement term used for describing light output from a projector.

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