Serfas Thunderbolt 2.0 Headlight

At 120 lumens, this light is best suited for being seen by others rather than illuminating unlit paths. It is an excellent choice for urban commuting or daytime visibility, but if you frequently ride on completely dark trails, you may want a higher-lumen option for better depth perception.

Yes. The Thunderbolt 2.0 carries an IP65 rating, which means it is fully protected against dust ingress and can withstand low-pressure water jets, such as heavy rain or road spray, without issue.

Unlike many sealed lights that become e-waste once the battery dies, this model features a user-replaceable lithium polymer battery. You can simply swap it out once the capacity diminishes, extending the overall lifespan of the unit.

The light uses a flexible, integrated handlebar mount designed for quick installation and removal. It is compatible with most standard handlebar diameters, making it easy to move between bikes or take off when locking your bike in public areas.

The seven modes allow you to balance visibility and battery life. You can toggle between steady beams for consistent light or flashing patterns, which are generally more effective at grabbing the attention of drivers during daylight hours.