I have no idea if this voltage regulator is wanted or needed but I did find this Shimano SM-DH10:
http://www.starbike.com/php/product_...g=en&pid=11712

I bought a Shimano DH-2N70 on sale on eBay. I know that model is 2.4 watts. From what I read, the 3 watt models are for 2.4 watts for the front light and 0.6 watts for the rear light. If you go to the Busch & Muller website (http://www.bumm.de/), you'll see examples of 25 lux, 40 lux and 60 lux of light. Thing is, there isn't just power. There's also WHERE the beam of light is going. If you look at the peterwhite site, you'll see how one of the B & M models projects the light much closer to the bike. But that one is only 40 lux. At the same time, the model I wanted (Busch & Muller Lumotec Lyt) is only 25 lux but it cost way less at bikexperts.com and I read the beam is sufficiently spread out (although that's not clear in the photo I saw lol). Either way I intend to save more money by just buying a cheap WBT Freedom Ryder 23 rim and DT Swiss Champion spokes.

I'm hoping for the best. One thing I wonder is, what happens when you back up your bike? Would it cause damage to go in the opposite direction? If I take a while before buying a dynamo powered light, can I ride safely on the wheel with the dynamo hub without having a light attached to it?