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So a 10mW laser with defocusing lens should be safe ? And where can one buy such a lens ? The 100mW + diffraction grating also sounds good.Is there a minimum distance between the grating and the laser source,or can I put the two almost in front of each other ? And again,where can such a...

I'm a costume designer,choreographer for a performance troupe.Recently we've started using stilts in our shows.My idea is to use lasers on the costumes to make them look more spectacular.Here is what I've made so far : http://img21.imageshack.us/img21/7184/74341531207485297128785.jpg...