Originally Posted by
no motor?
Good. Just remember that as it gets colder and darker everything is going to work a little bit less than it did when it's warm out. Lights won't be quite as bright, run times will be less (except for the dynamo light), and it's going to be darker. Remember the episode of Seinfled where they discussed shrinkage?
If your LED lights get dimmer when it's cold, there's something wrong with them. They're supposed to be current regulated, and LEDs actually get a bit brighter when they're colder. The batteries do last less long. LiIon is the least affected, I see about a 25% dropoff between 70*F and 0*F. NiMH is basically useless below 0*F, at -10*F my runtime went from 2 hours to 20 minutes. Also there aren't any AA powered lights that I consider to be sufficiently powerful for full dark riding.
I've bought a Cygolite Metro 550 for summer riding (for the strobe mainly during the daytime). I'm going to try it this winter, but in general I have been VERY happy with $30 generic Chinese lights. Several days between charges, quite bright. I like buying the ones with smooth reflectors (which tend to be spotty) then adding a $5 lens to the front to make the beam wide and low so the road gets well lit without getting into driver's eyes very much.