Originally Posted by
noglider
41 euros is $61. Uh, I don't think so. I think the most I've paid for a tail light is $30.
I have a few old bullet headlights and various stuff lying around to build as tail lights that I got in piles of stuff, trades, etc. for waaaay less than that. Since you aren't worried if it makes your bike a RAT, improvise...go nuts.
The only thing I have to wonder is what cold weather does to your batteries. Don't use NiCads, they will turn to MUSH *from experience.
I'm also not sure what benefits are to be gained at NIGHT with a flashing light...and I want to build a coaster brake trigger to light an extra lamp when I stop, of course.