The bontrager flare r rear light offers daytime visibility from up to 2km away flare r39s balanced optics set off with a powerful cree led can be seen from over 2km day or night 65 lumens and 270 degree visibility help to make you the biggest distraction on the road the bontrager flare r features 5 modes and up to 21 hours of run time when the battery power does dip below 5 light output is scaled back to substantially extend the remaining battery life bontrager flare r features