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Lumens: The brightness level (measured in lumens or ANSI-Lumens) is an indication of the level of light thrown out by the projector. This is very important for business presentation projectors. Contrast: Ratios above 400:1 would not be perceived by the eye if viewing does not take place in a completely darkened environment. So, for the boardroom that is good enough, for the home theater 1500 or above is better.== Video Projector Technologies ==== Best Application ==Some projectors are best for business presentations when connected to a PC while others are best for a television or movie theater type application. Now there are also cross-over' models which can handle both PowerPoint presentations in the office as well as DVD movies at home.LCD projectors are normally the primary choice with business projectors in view that these still have a brightness edge over DLP. DLP is still the favored technology when it comes to home theater use due to their improved black level performance and smoother looking projections that resembles more closely those at the movie theater.