I've received compliments on my Nite Ize SpokeLit lights. They don't need to be bright to grab people's attentions. Sometimes I run them with a single 2032 cell instead of two 2016 cells. They last longer, but using two cells makes them brighter. Either way, the cells last a long time.

I use only one in my rear wheel. When I tried it in the front, it distracted me too much. Your kilometerage may vary.