Blackburn Local 50 Front & 10 Rear Cycling Light Set Developed using the American National Standards Institute (ANSI) Flashlight Standard (FL-1) 2 LEDs emit 25-50 lumens of bright light 180 of visibility Runtimes: 26 hours High (50 lumens), 50 hours Low (25 lumens), 122 hours Blackburn Strobe (25 lumens)