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http://www.darkerside.org/2013/11/luxos-iq2-u-dynamo-headlight-review/
"[Edit, April 2014: the new Luxos IQ2 model has a permanently connected wire, which removes the risk of water ingress, but also prevents you using a cable extension if you’ve got a longer-than-normal-bike length from mount to handlebar."
Review of the updated version..
http://www.darkerside.org/2014/04/review-update-monkii-luxos-iq2/"Instead of attaching via a plug and socket arrangement for the remote switch/USB charger, the latest IQ2s now have a permanent connection with a (short) fixed-length wire. This is grand if you only use the IQ2 on a conventional bike, but on recumbents or cargo bikes you now can’t stick an extension cable between the lamp and switch. So you can’t have the switch on your handlebars."
Don't they have issues with their USB ports or something? I was reading good things about some other German lights that use the B&M mirror, um, Schmidt Edelux II I think they were. They look better than the B&M lights too :)