Projectors cast an image by shining an intense light from their internal lamp to a surface several feet away. In Promethean’s case, the light is directed onto an interactive ActivBoard.
The total amount of visible light emitted by the projector lamp is measured via a unit called a Lumen (lm). Thus a projector with a higher lumens count is capable of projecting a more intense (i.e. brighter) image onto a surface.
ANSI Lumens is a term used to describe the standardised measuring of a projector’s light output. Thus a projector which claims to have an output of 2000 ANSI Lumens can claim to be brighter than a model with a lesser value.
The specifics of the tests are beyond the purpose of this article, but we have provided a chart below which outlines our projectors, and their total ANSI Lumens output.