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Good project! Impressive! But be DOUBLE CAREFUL with lasers.To protect your eyes from BLUE laser you need RED googles that block blue and green light (opposite of the spectrum, as far as possible).Green googles are not good enough, because green color is too close from blue, green googles do not block enough blue light. Or you need excellent green googles.---------------Same idea, when you play with RED lasers you need BLUE googles.The error (which you did not make) is using BLUE googles for BLUE laser, because blue laser pass through blue googles. Same for RED.