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I guess I should ask how you are using it i.e.: what type of screen, rear or front projection or how do you plan to display your projection?
 

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I have heard that if you put a round piece of cardboard over the lense and cut a small hole the size of a quarter, it will brighten it. The theory is that it focuses the beam. I tried it with a cheap wonder wall projector and it seemed to help.
 
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