I have (and use, and have given as presents, and like, and get a lot of positive comments on) these on my wheels. Sometimes just one on the back wheel, other times two on each wheel.

I have this headlight on my bike, this taillight, this headlight on my helmet, these front and back on my bike, and sometimes one of these wrapped around part of the frame.

I also sometimes wear these on my ankles, and sometimes wear an inexpensive reflective vest similar to this one. And in my handlebar bag, I have a set of $6 LED lights that strap easily onto things, such as handlebars, just because they were really inexpensive, small, and looked useful. (One white for a headlight, the other red for a taillight.)

I often ask people as I ride around the lake in the full darkness if they saw me coming. They always answer yes (and then laugh, which is why I ask). If I rode more trails at night that I don't know as well as the trails I ride at night, I'd get a brighter/better headlight, but for the riding I do, what I have works well enough.

I'm always surprised at the number of people I see out on the trails -- in the woods, in the dark -- who don't have any lights/reflective anything on them.