I have yet to do more than the 300k but In upgrading my lighting from my pretty nice bottle dyno, I went for a hub dyno for less drag. I thought about the B and M battery light because I prefer that German light pattern but big bucks $$ for the B and M. The SP hub plus spokes is cheaper.
Maybe later:
https://www.rosebikes.com/b-m-ixon-s...dlight-2654936
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I don't do: disks, tubeless, e-shifting, or bead head nymphs.