I found that wheel lights that do not depend on the speed not only are very visible but also win compliments from others. I got compliments "I like your bike!" from taxi driver, old lady pedestrian, and small kid. What more could you hope for than taxi drivers' liking you? And the old lady crossing the street not being scared of you?
I've been looking at wheel lights, but every time I find something I like a lot, I read the reviews and each time there's questionable reviews. It eats batteries alive, the lights stopped working after only a few weeks, inconsistency between the two sets purchased, other manufacturer flaws, etc. So far I'm not finding anything that I like and the bulk of previous purchasers liked.