A few years ago there were some imitation superflash lights on ebay going for something very cheap like $5 for two of them. I looked at a couple of them, and look to be nearly identical (except for the optics). I wouldn't be surprised if the Planet Bike electronics/optics fit into the imitation back. I'm curious now, so I'll try it when I get home.
2014-10-16 12:29:13