The Schmidt Dynamo front hub or SON (Schmidt's Original Nabendynamo) weighs 1.5 lbs and has significantly less drag than either tire driven dynamos or any other hub dynamo. Made by Wilfried Schmidt Maschinenbau in Tübingen, Germany, the hub is quiet and reliable, and is designed to give at least 50,000 kilometers of trouble free riding between servicings.
This is worth reading.....regarding SON Hub Dynamos.
Sorry if I sound like an advert.