How many lumen does CIO have? Mille Stech Jensen July 08, 2019 07:41 Updated Check the datasheet for CIO through the link below to find exact numbers. Go to datasheet Related articles Data Sheets How much light does UGO emit? Can CIO be mounted on a carbon bike? What is the maximum bend angle of the mount? My CIO bike light does not flash? Comments 0 comments Article is closed for comments.