Agreed about wheel lights. I have a Nite Ize Spoke Lit on my rear wheel. It's not bright but it's a great attention getter at night. I don't have one in front because it distracts me too much. It uses two CR2016 cells. I don't know how long it runs. I have to replace them every few months. On a 1200k you should bring two or four spare cells. And you can run it on a single CR2032 cell with reduced brightness and double the time. I've done it when I ran out of CR2016 cells.