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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...
I am trying to track down the output rating for the Edelux II.
From the SON rear light instructions mention: