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


Thunderbolt Headlight

Availability: Check Store Availability
Product Rating
5.0 stars
 (1 Review)

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


by PowerReviews
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5.0 stars

(based on 1 review)


of respondents would recommend this to a friend.


  • Attaches to any bike 
  • Awesome side visibility 
  • Great visibility 
  • Recharges using usb 


  • Needs frequent recharging 

Best Uses

  • Daytime headlight 

Reviewed by 1 customers

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Displaying reviews 1


Best I've seen for daytime use

By Mike Jacoubowsky

from Redwood City, CA

About Me Avid Cyclist

Verified Reviewer


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

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Option Barcode Manufacturer's Part Number Store SKU
Black 00713835022931 USL-6BK STR23909015K
Blue 00713835022948 USL-6BL SER31223821E
Green 00713835022955 USL-6GN SER32270086N
Pink 00713835022962 USL-6PK SER31857003K
Red 00713835022979 USL-6RD STR21561911D
White 00713835022986 USL-6WT STR18938303E
Yellow 00713835025833 USL-6YL SER33964274W