If your good at building electronic circuits yourself check this link.
http://www.pilom.com/BicycleElectron...moCircuits.htm
If you're not good at this sort of thing Bike nashbar has a light that is made for a dynamo hub.
http://www.nashbar.com/profile.cfm?c...eid=&pagename=
They also sell the dynamo hub.
http://www.nashbar.com/profile.cfm?sku=17445