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3W is pretty much standard for hub dynamos and is ample to power any front/rear light combo and in most cases (at average road speeds) a charger too. Some 1.5w models do exist (shimano make a 1.5w XT model) that will power lights only, the advantage being lower resistance.
The vast majority of dynamos/lights are built to be plug & play so you don't really have to worry too much about power outputs. Any light from supernova, B&M, exposure etc. should play nice with that hub, feel free to check first though.
ThePeginator
I'll get a few more pics today, looks like it matches the hub in @sohi 's link. Comes with replaceable end caps.
Another ridiculous question, how would I know how powerful it is? And what lights it would be able to run? It says 6V3W on the side so I'm assuming I aim for two lights that require half of that?