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Time to find out if you can wire a RedEye to a Edelux II...
I imagine you can, although you may need a current-limiting resistor like in the Sinewave Beacon instructions - it would depend how the Edelux drives the rear light and what its output is rated to. If it's capable of driving the Redeye at full current you may find that it diverts current away from the Edelux so the front light is dimmer. If you do need to use a current-limiting resistor then the Redeye will be dimmer than normal, and some of the power produced by the hub dynamo will end up being wasted heating up the resistor.
I did consider that briefly, but assumed the SON wouldn't actually be so underwhelming. Time to find out if you can wire a RedEye to a Edelux II...