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A lumen is a measure of the projector brightness. A digital projector with 2000 lumens is twice as bright as a projector with only 1000 lumens. Digital projectors are often compared using the formula of “Price per Lumen”. Therefore, everything else being equal, a 1200 lumen projector, will be a little more expensive than a 1000 lumen projector.
Talk with a sales consultant that understands how much projector brightness you need for your environment. Once you've nailed down the number of lumens you need, make sure you don't pay for excessive brightness over that count.