Review on Enhance Night Cycling Safety with Greerride Rechargeable Bike Helmet Light - Flashing and Steady Modes for Increased Visibility by Bradley Stewart

If you only have one headlight on your bike, MAKE IT A HELMET LIGHT. have a headlight mounted on a handlebar or frame. This is a great helmet light and mounting system. Very satisfied. myself. (One on a helmet, the other on a bike). Also, both ends light up when connected to an external power supply, allowing me to power the unit from my hang glider's power supply on very long trips. In fact, one block is probably not enough. you need her buy two. Maybe 3 or 4. Probably 5. :)