http://www.sjscycles.co.uk/shimano-alfine-disc-dynamo-front-hub-15w-black-32-hole-prod37209/ £30 on SJS, only 1.5w but should be fine for LED lights (ie comutting).
I use an Alfine Dynamo on my cargo bike.
It's plenty powerful enough, powers two b&m lumotech front lights and a rear light no problem.
I just put a shutterprecision hub on my commuter/mtb with a b&m iq2 light, usb charging is awesome!
@M_A_X started
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http://www.sjscycles.co.uk/shimano-alfine-disc-dynamo-front-hub-15w-black-32-hole-prod37209/
£30 on SJS, only 1.5w but should be fine for LED lights (ie comutting).