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    Need help choosing safe lasers for light show project

    Hi! I have wanted to make a light show for a long time. Right now on my hands, I have a 20mw purple laser module from DX and 2 diffraction gratings from DragonLasers. Today I saw this video : http://www.youtube.com/watch?v=f4j1ZmQbjoU (Here is the setup in case you are curious ...


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