New York Toner Xeccon Spiker1210 1600 Lumen Bicycle Road Commuter & Racing LED Bike Light Super bright 1600 Lumen, using four Cree XP-G LED. Automatic Sensing mode senses surrounding light and adjust brightness accordingly. Fits 25.4mm - 40mm handlebar and helmet; helmet mount kit INCLUDED. Simple High/Low/Strobe mode, with strobe function to alert motorists. 7800mAh Samsung Li-ion battery provides enough power for up to 16 hours run time.