The Prolite 2000 lumen bike light is one powerful bike light that can be mounted on a bike helmet easily. It has two Cree XM-L2 LEDs and max output of 2000lm for mountain riding. Powered by 4400mAh lithium battery pack, the headlight can light up for over 3 hours on high mode. It’s also designed with different brightness levels and hidden flashing modes for riders to use in different circumstances.