Sirius mk5tracer lightset 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 there are now more cars on the road than ever and modern motoring life is full of distractions radio satellite navigation and hands free mobile phones to name a few 80 of all traffic accidents involving cyclists occur during the daytime source rospa 2014 our new day