Do you have one? Where did you get it? How recently? Last I heard they went out of business.
Here's the story ....
I was approached by a fellow Randonneur to "test" the Lightspin before the PBP in 2003. The idea was that I would ride with it on my qualifying brevets, and on the PBP, and then I would give this marvelous testimonial about how wonderful this light was. No problem, it was free so why not.
It worked GREAT for all my qualifying brevets, and worked GREAT all the way through the PBP. Then 2004 came. 2004 in Manitoba was cold and rainy, and the spring mechanism went and I blew through all my pulley caps ... it slips badly in the rain, so you don't get any light at all unless the spring mechanism is set really tightly against the wheel ... which is hard on those pulley caps, and also hard on the springs.
They sent me a whole new unit, and set of pulley caps, in August of 2004, and I was told that was the last of their stock .... they were terribly sorry but they were going out of business.
My new Lightspin lasted just a couple months in all the rain I was riding in both in Manitoba and in Australia .... and it died in the middle of the Great Southern Randonnee (in Australia) in October 2004.
I have managed to get it working once or twice since but it doesn't last long (like anywhere from a few minutes to maybe an hour). I've had three people skilled in electrical things looking at it and helping me rig up the wiring etc. but nothing seems to make it last anymore. Maybe if I ran it on my front wheel and didn't have to have several feet of wires all over the place it would be better, but that's hard to do with my setup.
I currently use battery lights, and they work all right ... they aren't nearly as noisy as the Lightspin, and they don't suck the energy from your legs when you ride at night.