Serfas' Thunderbolt (USL-6) gives you high-performance for a great price.
If you're riding at night, let Serfas guide the way with our Thunderbolt (USL-6) Headlight. The 15-micro (double strength) LED strip puts out 90 lumens, giving you plenty of light to help you safely arrive at your destination.
Charge up, light up and get riding safely at night with the Thunderbolt
Replacement straps available here!