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Mine's a Shimano hub, which means just using the connector block with stripped wire ends; if you go for a SON, you'll need to use spades or solder in the coax adapter (barring exotica like the SL hub). The Edelux comes with spades already attached. I went for the Edelux over other lights because it's pretty and I love the shiny, but I've been really impressed by the performance; at my normal audaxy speeds (25-30km/h) I've been happy to ride on crappy lanes and semi-surfaced park paths in the dark.
Ta! It piggy-backs off the front light. Unlike the B&M lights, which have two spade terminals for the rear connection, the Edelux has just one - the lamp body is grounded to act as the other terminal. I bought the SON ready-made rear loom, which has a ring terminal (to be sandwiched up against the lamp body in the mount) and a spade terminal; it uses coax cable, which is supposed to be more durable than bell wire. I figured the fiver it cost was worth not having to faff about with crimping or soldering. You can just see I've taped it alongside the top tube brake cable, and then spiraled it along the rack legs.