Calling all electronic engineers…

I have a Shimano XT dyno hub which is currently running through a birdge rectifier, two massive capactiors and a buckpuck constant current device to an LED light which I built. Can't remember the type but it's plenty bright enough for commuting.

I am wondering if anyone has measured the power output from such a hub, and whether it could be split between and front and new rear light – like this: http://www.chainreactioncycles.com/Models.aspx?ModelID=31363

I would do the rectifier and smoothing capacitors again as they are cheap. Not sure what type of power the Exposure thing needs unfortunatly, any ideas?
Cheers
Gareth