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I am trying to track down the output rating for the Edelux II.
From the SON rear light instructions mention:
The 6V-3W hub dynamo-powered SON rear light (K 920) is made for use with a 6V-2.4 W-LED-headlight or 6 Volt DC supply.
atk-
That suggests that the SON rear light is intended to take 0.6W. I think the RedEye is 1W. Trouble is, there's nothing I can find which explains whether there's any current limiting circuitry in the Edelux rear light supply and, if there is, what it's rated to. Or, indeed, whether the rear light supply has any power rating limitations or whether, if you wanted to, you could chug the whole 3W down to the rear light.
There's one way to find out, of course, but it's a bit depressing if the answer isn't the one you were hoping for...
Brommers
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.