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Also the connectors for rear light on the Luxos are labelled +/- so would indicate DC output?
Fair. However, the connectors on my rear B&M light (a secula) has no markings on it. The connectors on another B&M rear light I have (topline brake plus) do have markings.
However, I suspect that this may be the same as the older Marathon Supremes. They didn't have a preferred rotation direction so one wasn't marked. People were confused and continually asked them, so they put one on just to shut people up.
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.