Standing out in the busy streets the sirius puts out a strong 550 lumens in a wide beam for all round great visibility on the road and with excellent side visibility to help keep you safe and seen with convenient usb charging and a quick release bracket it makes the sirius the perfect commuters light of choice cnc aluminium bodywork is packed with innovative patented technologies managing power and optimising brightness in the box sirius mk5 tracer handlebar bracket seatpost brac