Moon comet x pro rear lightthe moon comet x pro rear light is a super bright 80 lumen seat post mounted rear light that will help to keep you seen on the roads at night designed for the everyday ridercommuter the light is water resistant lightweight and compact enough to fit in your pocket with ease as well as keeping cars and other road users at bay as they approach you from behind the light also warns road users when cycling roundabouts and also when pulling out of tight cross junctions a