Diagnostic Light

[Alan Anderson]

Originally Posted by jee7s

...our light drew about 1.3A when on.

While that's a useful bit of information, it's mostly irrelevant to the question of wire size. You need to choose wire that won't melt before the circuit protection kicks in to cut off the current. Don Rotolo gave the officially correct answer (18 AWG) based on the breaker protecting the entire Digital Sidecar, though a different answer might be possible based on detailed knowledge of the light driver circuitry.