I don't know if that's what he used, but I rode with a guy who definitely had an E-Bike light coupled with a son hub.
And as he was German in Germany I would guess he used the Forumslader.
That´s interesting. Is there any chance you could have this German briefly describe their setup on here as Jens During, the designer of the Forumslader, seems too busy to answer emails at the moment?
c.h.e.
Petteri
"12V Lichtausgang für E-Bike Gleichspannungsscheinwerfer" (http://www.forumslader.de/automatiklader/)
Wie bitte? Does this mean one can simply wire up an IQ-X E to this thing and get 150 lux at 25kph from a 6v/3w-rated generator?
Any experiences of the Forumslader replacement control board for the IQ-X (AC version) would also be appreciated.