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From Buff Tech Support website when someone asked if 14ga wire was OK for 300ft run:
"300' with 14ga. will be fine, but you may experience a slighly longer recycle time. Also avoid rapid firing the lights, as that can generate heat in the cords at those lengths."
Paul Buff responded to this personally:
"TS is basically correct. But any heat generated in the cord is distributed along the 300' length so is of no consequence. As for recycle time, the difference would be so small I don't think you would be able to measure it."
Hope this helps,