Top Brightness: 930 Lumen Bike Light with Cree XM-L2 LED, Li-ion Battery and Charging Kit Included The BRIGHTEST Single LED Bike Light on Amazon ( 930 Lumens i.e. 3.5 X Brighter Than the Top Sellers - Please do compare the lumens before making your decision) - With the latest 2nd generation Cree bulb, this bike light is extremely bright. Measured under FL1 specifications it has a light output of 930 Lumen when set at the High mode. Adjustable Zoom Focus: The focus of the beam can be adjusted by spinning the head to fit with using in different situations and on different tracks. You can toggle through 5 modes with the tail button: High, Medium, Low, Strode and SOS. Built in Single Chip Microcomputer: The chip enables lower battery warning, battery protection, momory of the last used mode Easy Mounting: With the flexible mount bracket, you can easily mount this headlight on any bike without using any tools. Built to be Tough: The body of the light is built with air-craft grade aluminium and finished with top quality anti-abrasive anodizing.