Join Date: Jan 2009
Location: Columbus, NC USA
Bikes: Trek Single Track 930
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If it is Incandescent, It will be happy as long as it has the right voltage. Led's are a different story, They have positive and negative leads on them. (a quick google search reveals that it is an LED source)
LEDS are operated on DC current, and from reading the previous posts, a dynamo hub provides AC. This leads me to conclude that the LEDs are powered by some form of Diode rectifier circuity inside. And diodes rectifiers are designed to handle current for both of the leads. My educated guess is that you would be fine running a 6 volt Source through the leads. I wouldn't leave it attached too long, Maybe 1 or 2 seconds. If it doesn't work in that amount of time, it won't work longer.
(DISCLAIMER: IF YOU FEEL UNSAFE WITH ANYTHING THAT I SUGGESTED, DON'T DO IT!! ALSO, I PROVIDE NO WARRANTY, EXPRESSED OR IMPLIED WITH MY ADVICE.)
sorry for the lawyer talk, but based on my knowledge of electric circuits, I am confident that your gear won't be harmed.