Now I'm curious Lynx Arc (or nostalgic?) - a quick Google search just found a few pictures of the unit I had, along with some useful info.
It was a Sanyo Dynapower that drove off the tread rather than the sidewall and supposedly was rated at 6V 3W. (500mA) Slipped a little in wet conditions and no use at all if muddy but was "cutting edge" at the time. Less drag than the sidewall "bottle" model I had before then but apparently no regulation. Some people complained of blowing bulbs at high speed but as I was mostly a tourer it never happened for me

, even before I wired in the rectifier and 6V cell.
I'm not sure about the bottle model I had, but was definitely AC on the Sanyo Dynapower. The filament bulbs didn't care of course.
But we may be getting a bit too far OT now.
Looks like
GlowBike has already made a decision but to answer the original question...... I'd personally probably just mount a good flashlight or two on the bike now and carry spare cells. There are some nice AA lights with good throw for sane night speeds and Eneloops are cheap and lightweight enough to carry plenty of spares. Then I can easily take off one of these lights for other tasks if I need to. I can appreciate that a specialist bike light will have a properly designed beam profile though. It also depends on whether you mind carrying extra gear in a backpack, pannier or handlebar bag.
But regarding how to power it - these days I'd fly in the face of most of the posters here and just stick to a battery pack rather than muck about for 500mA from a dyno. For week-long touring trips I'd carry spares and go with a solar panel option. If you haven't heard of it, this thread
http://www.cpfmarketplace.com/mp/sho...2-panels-added has some very interesting stuff. I have just ordered a foldable solar charging kit with USB charger for Li-Ion cells. I can also use it with a couple of Sanyo USB travel chargers for my Eneloops.
YMMV
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