I just had a look at Schmidt's website and they say the Edelux II is *not* to be powered by DC. Whether it'll blow it, or they just want to sell the DC version of the light, I don't know. I personally wouldn't risk trying it.

For me, I want to use a shaped beam light vs the a regular battery powered one. Depending on how long the nimh cells last, I might try to hide them in the steerer tube, or purchase a dyno hub.