That's a good point about it being the same as other things like derailers, etc. And maybe I could also find a less common than standard bolt to bolt it on. The light will be going on a touring bike that I'm taking to Europe and I use for transportation around town. I'm mostly worried about something getting snagged while locked up in Europe while we're visiting a museum or something. I'm liking the idea of the Blaze that Mr. IGH posted and the B&M lights. I'll just have to figure out which is brighter for the money.

Thanks to everyone for the input!