Serfas TSL-550 True Light Headlight

This is one of Serfas highest powered USB rechargeable lights and a tremendous value. With a max lumens of 550, this light will get you where you need to go when the sun goes down. It has an interchangeable lens with Standard or Wide Beam Patterns. Included is a universal handlebar mount and universal helmet mount plus USB charging cable and wall adapter. This light's specifics are listed below including run times and lumens per mode:
Overdrive: 2 hours (550 lumens);
High: 3 hours and 40 minutes (330 lumens);
Medium: 4 hours and 40 minutes (230 lumens);
Low: 9 hours and 30 minutes (120 lumens);
Flashing: 7 hours
Charge Time with USB: 5 hours and 30 minutes
Charge Time (wall charger): 4 hours
Battery Type: 3300 mAh
Replaceable Battery: Yes