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In the past, overhead projectors were the only option a classroom had as a classroom projector. Because technology continues to grow, so do the options. So now that newer, more-advanced technology is available, the lighting becomes more of an issue. Since classrooms may want to keep the lights on, it is important to have a projector that will be bright enough to be useful. A light output of 1,000 ANSI Lumens is good for a only very dark rooms. Many projectors today have a brighter output, so look for the highest available. Brighter is better – go for at least 2,000 lumens.