A long cord at high load browns out lights and cooks cheap wire. Distance and amps in, the right gauge and expected voltage drop out.
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16-gauge at 100 feet is not the same cord as 12-gauge at 100 feet, and holiday loads find the difference. The advisor sizes the AWG for your run and shows the drop you'd get from each choice.
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<iframe src="https://getcrewplate.com/embed?trade=lights&tool=cords" width="100%" height="1150" style="border:1px solid #CBD5E1;border-radius:10px" loading="lazy" title="Cord & gauge advisor"></iframe> <p style="font:12px/1.5 system-ui;color:#64748B;margin:6px 0 0">Calculator by <a href="https://getcrewplate.com/free-tools">Crewplate</a> — 26 free trade calculators</p>