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Will find out if the blurb is correct later in week when I get around to sorting my own bikes out. Bloody customers wanting their bikes fixed.
Afaik cheaper b+m front lights don't have the cap in them, instead dumping ac to the rear light, which then takes thr ac, pumps through a capacitor and then feeds its own led. Have a cyo n + (i think) which has a cap in the front light and dumps out 6vdc to rear light. In my case the e3 v2 apparently has a 2 min standlight also. Maybe they will play nice together, maybe they won't!
Let us know how you get on. The general consensus here was that the Supernova rears didn't have a capacitor and the front light provided power for standlight function. Whereas B&M lights don't provide standlight power but the typical AC rear lights had a capacitor.