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Ah, the LED thing makes sense (wait - actually the connectors for rear light on the Luxos are labelled +/- so would indicate DC output?)
! Re capacitor I've read that it's the supernova front unit that takes care of it. It would make sense as the tail light is so tiny.Someone somewhere posted a circuit schematic to have some stand light with B+M front + Supernova rear.
edit: found it; http://bemme51.blogspot.co.uk/2017/02/bicycle-standlight-with-son-edelux-ii.html ; what I haven't found yet is the motivation to undertake the mod.
Again, I've been running a supernova taillight fine with a b&m luxos U for a bit less than a year now :) No stand light though.