ANSWERS: 4
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Cheap bulbs likely won't be very bright (pay attention to the lumens of a projector, the last one we bought where I work was 3000 lumens because we didn't want to HAVE to turn the lights off to use the thing), and probably won't last very long. They're expensive for a reason.
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I don't know what is the cheapest - something I'm sure you can research on your own. however, I do know that the lamps (they're called lamps by the way) last for a VERY long time,and the life span is usually measured in hours, so make sure you look at lamps according to their projected life span.
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you don't need to look for the cheapest lamp, you need to look for the lamp that give you the must hours life. you can look at http://www.projectorlampsworld.com.
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It's not a bulb,but the lamp and the housing, they are all over 200-300 bucks.
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