Serfas Thunderbolt USL 6 gives you high performance and endless mounting options 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 safely arrive at your destination. What's your mounting pleasure The USB rechargeable Thunderbolt can be mounted virtually anywhere on the front of your bikefrom the handlebars to the fork. It's your ride, your call. Charge up, light up and get riding safely at night with the Thunderbolt.