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Thanks. Also, I understand that the red and blue laser have to be more powerful than the greens to show up as well. I have a 50mw greeny, how powerful would I need a red or blue to be comparable (able to see beam really well at night). Which ones (if any) allow you to see the beam during the day?

Thanks for the replies, but what I really wanted to know was how long they last. (I did search)

Noob here, please excuse me if this has been answered a billion times, but how long do the diy, blu-ray lasers last? how much power is needed to light smokes? 400+?