Moon arcturus auto pro rear lightthe moon arcturus auto pro rear light is an attractive light that will fend off any rear approaching vehicles or other cyclists with 7 modes you are able to cycle through them all until you find the one that best suits the conditions you are riding in or the remaining battery life producing 100 lumens this is bright for a rear light and combined with an integrated light sensor the arcturus is ideal for the daily commuter featuresconstruction engineering gra