Music video by Justin Bieber performing Never Let You Go. (C) 2010 The Island Def Jam Music Group. #VEVOCertified on November 9, 2010. http://www.youtube.com/vevocertified.
Lumens are a unit of measurement of the total brightness that comes from a light source, in this case, a projector. One may also see the term ANSI Lumens. ANSI is an acronym for the American National Standards Institute. In general, the more lumens a projector has, the brighter the image on the screen.
These projectors are the least expensive, but the low output of light means that they have to be in a dark room. These projectors are best on smaller screens. 1,000 to 2,000 Lumens. This is a common lumen range and these projectors need to be in dimly lit rooms.