It's AC and I use a $15 generic voltage regulator I get from Tucker Rocky to keep from overpowering the lights. I made my own simplified wiring harness and don't run a battery. I'm using an $8 Harbor Freight rubber tractor light on the front and a $10 LED tail light from eBay. The lights dim a tiny bit at an idle but as soon as I give it any throttle at all they get nice and bright. I work the second shift and come home through the country where it's really dark but the tractor light gives me plenty of light. A friend has the same setup on his step-though but runs two of them side-by-side for a "Baja" look and they work great.
I've used this setup for two years and it's been stone reliable with absolutely no failures.
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