This is the measure of light output from a projector. Care should be taken here when choosing which model is right for you. It's not a case of the brighter the better. For home cinema, you should bear in mind that you'll normally be sitting in subdued lighting to get the cinema ambience, which is why most home cinema projectors are 1000 ANSI Lumens or less. If you're giving a presentation to 10 people on a 6ft. screen then a 3000 ANSI Lumen projector will be too bright to look at. As a rule of thumb, for 1-10 people 1500-2000 lumens should be fine, for 10-25 2000-2500 ANSI Lumens although ambient light and the screen you are using will make a difference.
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