Was there one in particular you were referring too...That link shows way too many so is not clear as to which one your referencing.
The site shows all the different parts and combinations possible, Replacement parts etc...
If their parts list is looked thu, you will see their 12v lighting kit and everything that's needed,
IMO forget about the Mini Gen and just use Rechargeable Lion battery powered lights.
Their usually good for 4 hrs. Not many ride more than that a day, Then just plug in and charge over night while you sleep