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powering my 638 nm 700mw laser

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hey im kinda new to the whole building lasers i have got the basics down but im still abit fuzzy with the voltage and amps.

this is my set up im getting Oclaro 700mW 638 22mm Module W/Driver &
Three Element Glass Lens
510 Threaded Connection
Power with 2-6V or one 3.7V Li-Ion.

well obviously i would power the laser with the volatage it says and idk probs a 4500mA battery but the module gives me a choice of 900mA,1A,1.A or 1.2 A so i need to know what would be the best choice for my laser like how many amps would be the best. thanks :yh:

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