Headlights

Serfas' Thunderbolt Headlight delivers 90 lumens in an extremely versatile, USB-rechargeable package. Attach the water-resistant silicone body nearly anywhere on your bike, and use the high, low, or two flash modes to make sure cars, cyclists and pedestrians can see you at night. At just 50 grams, you won't even notice it's on your bike — but others will!

The Serfas E-Lume Series light line was developed to be the best on the market at the very best value. These headlights will meet and exceed their expected lumen output while offering you all the features you've come to enjoy from Serfas lighting. - Compact Lightweight Aluminum Design - Super Bright (250 Lumens) Output - Water Resistant Rating: IPX4 - 3 Level Battery Life Indicator - Last Mode Memory - Max Charges Rate of 500mA - Charges from Dead to Fully Charge in 2.5 hours (Using 500mA Rated Charger) - Solid Modes: High (250 Lumens): 2.5 hrs, Medium (100 Lumens): 4.25 hrs, Low (50 Lumens): 7 hrs - Flash Modes: Daytime Flash (250 Lumens): 50 hrs, Low Flash (50 Lumens): 18 hrs - Weight: 142 Grams with Bracket - Battery: 1-Cell Li-Ion, 1400mAh Includes: - Micro USB Cord - Handlebar Mount