Originally Posted by
khosch
You might check this out - it attaches on the front wheel and powers a front and rear light via a magnet. It is very reasonably priced and I find it works great:
http://handlebarhelper.com/
It's interesting, an external dynamo. There are no tech specs at the website, no indication of how much power it puts out or what size LED the included lights have. Oh wait, here it is:
http://www.magtenlight.com/
15 Lux. I like it, a better deal than flashlight + blinky for my kids for sure, not so sure about longer-distance commuting...
Wow I checked out MTBRs LED review and they say a minewt 350 puts out 19 lux to their setup:
http://reviews.mtbr.com/blog/2011-bike-lights-shootout/