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Blue has always been my favorite color and maybe that's why my first lase was a 445nm blue laser but for anyone thinking of a water proof build for underwater use you can do no better that blue because water is a light filter and the deeper you good the more the different colors get filtered out until your left with nothing but blue !
Here's why......
https://www.youtube.com/watch?v=PDTLH7QSjyQ&feature=youtu.be
Here's why......
https://www.youtube.com/watch?v=PDTLH7QSjyQ&feature=youtu.be
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