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> Bicycling Catalog > Accessories > Lighting > Headlights > Serfas > Thunderbolt Headlight
Serfas Thunderbolt Headlight
  • Color: Black
  • Color: Blue
  • Color: Green
  • Color: Pink
  • Color: Red
  • Color: White
  • Color: Yellow

Serfas Thunderbolt Headlight

Product Rating
5.0 stars
 (2 Reviews)

Product Details

Serfas Thunderbolt Headlight

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!

Features and Information

  • Run time: 1.5-9 hours, depending on setting
  • Part Numbers close open

    Option Barcode Manufacturer's Part Number Vendor Number
    Black 00713835022931 USL-6BK SER-USL-6BK
    Blue 00713835022948 USL-6BL SER-USL-6BL
    Green 00713835022955 USL-6GN SER-USL-6GN
    Pink 00713835022962 USL-6PK SER-USL-6PK
    Red 00713835022979 USL-6RD SER-USL-6RD
    White 00713835022986 USL-6WT SER-USL-6WT
    Yellow 00713835025833 USL-6YL SER-USL-6YL
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  • Consumer Reviews close open


    by PowerReviews
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    5.0 stars

    (based on 2 reviews)


    of respondents would recommend this to a friend.

    Write a Review


    • Great visibility  (2)
    • Attaches to any bike 
    • Awesome side visibility 
    • Rechargable 
    • Recharges using usb 


    • Needs frequent recharging 

    Best Uses

    • Daytime headlight 
    • Front headlight 
    • Rear safety light 

    Reviewed by 2 customers

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    Displaying reviews 1-2


    Safety at minimal cost and hassle

    By Jay

    from santa clara

    About Me Avid Cyclist


    • Great visibility
    • Rechargable


      Best Uses

      • Front headlight
      • Rear safety light


      I purchased a front Thunderbolt and two rear bolts and have been using the product for about a year. I don't know Mike but completely agree that it's very perplexing that cyclists aren't using lights like this in our local hills under all riding conditions. I typically do a 40-60 mile loop ride each weekend and use the light on a constant beam 'low power' setting. It's plenty visible and in warmer weather lasts a little over four hours (colder weather usually results in shorter run time). Unlike Mike I don't like flashing mode because descending a road like highway nine I noticed that the beam pulsing off the various signs marking the road really breaks up my concentration (I realized then how focused I am when riding at 40 mph!). Anyway, the other day I was climbing up nine and passing in front of vehicles lined up at the temporary stop light above Redwood Gulch. I overhead one motorcyclist say to another "look, that guy has a LED strapped to his front [head] tube" and the other replying "Yeah, that's a really great idea." Seriously, what more needs to be said? There's a reason why motorcycles use lights. It's wasn't something readily and easily available to bicyclists until recent years, but now that it is there is NO EXCUSE for not taking precautions to protect yourself. I simply shake my head when I see bikes descending King's in front of the Tripp road turnoff and realizing how easy it would be for a car to make a left in front of them and how much difference a daylight running light could make. The light is lightweight, easy to install with a couple rubber straps, recharges quickly and is overall a great product. I never ride without them.

      • Gift:
      • No

      Best I've seen for daytime use

      By Mike Jacoubowsky

      from Redwood City, CA

      About Me Avid Cyclist


      • Attaches To Any Bike
      • Great visibility
      • Recharges Using Usb
      • Awesome Side Visibility


      • Needs Frequent Recharging

      Best Uses

      • Daytime Headlight


      First things first. I own a bike shop, so sure, I make money selling these things. But I ride 7200 miles/year on the road, and this is the very best front light I've found for daytime use. Yes, daytime. Didn't used to think it was a big deal, but there have been too many accidents lately during the day, when cyclists were simply missed or blended into the background. People seeing this light often do a double-take, which is awesome. Highly recommended. --Mike Jacoubowsky, Partner, Chain Reaction Bicycles

      • Gift:
      • No

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