Anyone know what size wire to use for a pair of XL 80s?
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That would really depend on the distance that you need to run the wire and the current draw, as in a home run per light light or one run to both lights with a Y at the end. There are tables you can reference based on length and current you can reference. You can also do an online voltage drop calculator to see what size you would need. If I recall you want to keep voltage drop below 5% for motors, but I don’t know for sure on LED lights.