I think the idea behind using fiber optics would be to have a single light source for multiple light endpoints. So instead of having two led lights for the headlights, you would need only one led light, with 2 fiber optic strands emitting 2 lights from 1 light source.
still sounds confusing?!
here's a good sight that sells fiber optics and has some good info on different type of fiber optics. Oh, and they sell LED lights too.
www.FiberOpticProducts.com
They're cheap and reliable. I've bought from them before.