September 17, 200619 yr I have some old small mountain bike lights that used to run off a battery in a water bottle. I was wondering if they could be run off the electricle system as most bikes come with a light from factory. the lights are 15 and 20 watts each, I think they used to run off 7.2 volts but really not sure on that one. would these lights be hard on my magneto? thanks for the help. I want to start night ridding soon and need some good light.
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