|Number of bulbs|
|Battery life on high|
|Battery life on low|
|Battery life flashing|
Reviewed by 1 customer
Displaying review 1
Comments about Serfas Thunderbolt USB Rear Bike Light:
I usually don't like things such as lights hanging off my bike, especially in the rear. So I bought this light and placed it on my seat tube. On full brightness, constant or flashing, this light is blinding to look at, which is great. However, the battery life in these modes are extremely short, as advertised. When I ride at night, I often run the light on low-flashing. So far I haven't been hit so it must be bright enough. Another reason I like it is because I can place it on the seat tube or seat stays. Either way, it's easy to turn on and off without having to get off the bike.
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