I have a couple geeky questions:

If I have a 72V battery pack on my bike and want to step down the voltage for some lights, what bit of hardware do I need to slip in?

And if I step down the voltage to 24V, would that allow me to power 2 12V systems (front and rear lights) in the same circuit? Or do I need to use 2 separate transformers or whatever to get down to 12V for each system?

Thanks!