Road Bike, Cycling Forums banner
thunderbolt
1-2 of 2 Results
  1. General Cycling Discussion
    The Serfas Thunderbolt doesn't sound noteworthy until you get your hands on it. It's about the size of an AA battery, but when you turn it on, it's like a light fountain. The Thunderbolt headlight puts out about 90 Lumens and the tail light about 30. It is just so incredibly bright for its size...
  2. General Cycling Discussion
    The Serfas Thunderbolt became one of our favorite lights last year with its small, rechargeable package and serious Lumen power. It's an LED array that is visible from a very wide viewing angle, making it a perfect 'to be seen' commuter light. This year, the Thunderbolt evolves with a matching...
1-2 of 2 Results
Top