I was just wondering what the best type would be to use
I usually use 18 ga. I have a lot of it. You're pulling so few amps that you don't need anything special. If you can get your hands on Mil-spec wire used in aircraft, that would be great because of the low impedance.
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any scrap wire will do, i use old wire from cat 5 cables
i think thats the name of them
the same size as the LED legs works for me. the wire from old wall wart transformers seems to work fine. i once seperated a single strand of wire from a wall wart to put LED's in a hotwheels car and coated them with 2 ton epoxy for insulation. they were virtually invisible.