Originally Posted by
Athens80
Of course, if you went with a dynamo-powered headlight, you would get the automatic on/off feature you'd like, and there are no batteries to run down. I don't recall reading about dynamo-powered lights that give a good daytime-visible flash, however.
I don't know of any Dynamo powered lights that flash. They flicker at low speed because Dynamo output flickers at low speed.
In my opinion, flashing doesn't offer a big advantage, if any at all. However, the reason I didn't mention Dynamo lights is that they are not cheap. I happen to love them and have them on several of my bikes. They come on automatically, no matter what.
Aside: for some reason, my iPad thinks "Dynamo" should be capitalized. I disagree, but I'm not going to fight it.