Serfas Thunderbolt (USL-6) gives you high-performance and endless mounting options for a great price.
If you're riding at night, let Serfas guide the way with our Thunderbolt (USL-6) Headlight. The 15-micro (double strength) LED strip puts out 90 lumens, giving you plenty of light to safely arrive at your destination.
What's your mounting pleasure? The USB-rechargeable Thunderbolt can be mounted virtually anywhere on the front of your bike—from the handlebars to the fork. It's your ride, your call.
Charge up, light up and get riding safely at night with the Thunderbolt.
I was lucky enough to be in Mojo bike shop in SF when the Serfas rep came in showing the new Thunderbolt lights. WOW!!!!! Both front and rear lights are amazing! Great looking and so bright! The colors they come in are great and best of all, they are USB rechargable. I would have bought both front and rear right there, but sadly they're not available yet. Can't wait to get my hands on a pair of these!!
Gareth (San Francisco, CA, USA)
I like how this light is extremely bright and spreads light everywhere, plus the multiple mounting options...I may buy another one.
Steve Wilson (Clearwater, FL, USA)
I love this light. As a "HEY! I'm riding here!" blinking light, this thing grabs attention. I also use it as a headlight during my morning commute on some very dark urban trails. It's no spotlight, but it's very bright, and I can see where I'm going. My only complaint is that the way I have my light mounted on my handlebars, I can see the edge of the lens as I ride and it's so bright it's blinding. I put a small bead of black silicone on the edge of the lens to block the light and it solved the problem. Otherwise, on the taillight, being able to see the side edges of the lens is a good thing.
Mike (Oakland, CA, USA)
Bought both front and rear lights. These lights are amazingly bright. They are easy to mount anywhere on the bike. USB rechargable (2 to 3 hrs charging gives 9 hrs of light) and lightweight. Easily removed for recharging or theft prevention. Highly recommend these lights to everyone.
RON (Chesapeake, VA, USA)
I NEVER write reviews unless a product is well above and beyond, or absolutely dog poor; fortunately, this light solution is the primary, and not the later
. Everything you could want for serious riding: safety first with the super bright lighting to make sure drivers SEE you; USB rechargeable so you don't, have to cry if you can't, find a power outlet; mounts perfectly on my bike with as little drag as possible; many colors to chose from! They perfectly color match my bike!
I would gladly help sponser Surfas in my next competition if I were given the opportunity, ! Good job to the men/women responsible for the creation of this lighting, system. If I needed more than two lights, Id purchase a third!
Narciso Palma (The Woodlands, TX, USA)
I have been using this light for a while now. I remember when I was blown away when the representative came into our shop and showed me the new Thunderbolt. We post is light inside shop when were closed at night and we have people coming back telling us that the lights are obnoxiously bright which as a rider is a good thing
I noticed that when I ride with the headlight mounted on my front end that the light tends to blind me a little when I lean forward to sprint. But it not a spot light. And i love the wide spead of the beam. It is a good trade-off for me.
I love this light a lot. More than worth the price.
David G. Rodriguez (Los Angeles, CA, USA)
This is my first USB rechargeable light and I much prefer it over changing batteries all the time.
This seems brighter than my old light, and is very easy to mount and remove.
While overall brighter, this doesn't actually throw that much light immediately in front of me to light my path.
It's easy to remove. Very easy. Don't leave it on your bike if parked in public.
There doesn't appear to be any low-battery indication. The light will be working just fine at full strength and the next thing you know it's completely dead, and since it's USB you might find yourself without a headlight and without the ability to simply install new batteries.
There's nowhere on the handlebars on my bike that I can mount the light, and the head tube and front forks are both large enough I didn't feel comfortable stretching the straps sufficiently to mount the light. In the end, I used a clamp on accessory mount I had sitting around to hold the light, and it works pretty well.
Overall, a nice low-mid range light with some quirks/annoyances.
Jenny (Silicon Valley, CA, USA)
We love this light for its simplicity, its brilliant power and its hassle free performance.
SPCARBON.COM Bicycles New York.
Shawn P (New York City, NY, USA)
excellent mounting system for carbon sculptured road bars!!
very visible to other road uses!!
been caught out twice when batteries fizzle, dont know how many hours you can get from this light so i'll be charging this after every ride now
carlo (adelaide, SC, AUST.)
I mounted this through the air flow on the front of my bike helmet so that it would illuminate the path wherever I turn my head. It doesn't have a long focal throw, but it still did a great job. I ride on a golf course at night which tends to be windy, hilly, and dark. This helps me see a little farther down the path to where I'm going. At the same time I've got a handle bar mounted light that keeps the path lit. I wasn't fully charged so the thunderbolt quit at about an hour on my first ride (full strength.) A longer battery life at full strength with be appreciated. And a warning/dimming as the battery drains would be helpful. At intersections I noticed people notice me. Great safe light!
Stephen Whaley (Missouri City, TX, USA)
I'd give this a five star if the solid high output light would last longer than 1.5 hours. Would love to see a version with a higher battery capacity, but it's an amazing light for what it is.
Two thumbs up, extremely bright and a breeze to mount virtually anywhere on your bike.
queridiculo (Fort Lauderdale, FL, USA)
I bike commute to work and have both the headlight and the taillight; best lights I have ever had in terms of ease of use and brightness. Love the flexibility of the mounting system as well. The only thing to be aware of is that the lights only last a little over an hour on the brightest setting, so they need to be charged after every use.
Linda Schack (Manhattan Beach, CA, USA)
Let me start by saying I'm very pleased with ALL of the Serfas products I've purchased. On two occasions I've had problems with lights. In both instances they made it right with me immediately, no questions asked. I recently purchased a pair of Thunderbolt headlights to be used as supplemental (marker) lights. I'll be mounting these on the side of each front fork for side visibility. I am also running two Thunderbolt taillights on the side of each seat stay for side visibility in the rear. I am very impressed with the quality and brightness of my Thunderbolts. Up front I'm running their 1500 lumen headlight and the taillight is their 60 lumen model. When I hit the streets at night with all these lights turned on people will notice. I just hope the cops don't pull me over !!! You can't go wrong with Serfas.
David Branscome (Newark, OH, USA)
Check out how our new Thunderbolts turn this parking lot into a light show!!!
MTBR checks out the Thunderbolt at Interbike 2012
Turbo Bob talking Serfas lights.
Review of the Thunderbolt.
Reviews the Thunderbolt.
Scouting Magazine features the Thunderbolt.
New York Times features Thunderbolt.
Review of the Thunderbolt.
Thunderbolt wins "Best Commuter Light" and "Most Innovative Light" award.
Manhattan Magazine mentions our USB rechargeable lights in their March Issue (Page 50).
Turbo Bob's Bicycle Blog on the Thunderbolt.
Bicycling Magazine (South Africa)
Bicycling Magazine (South Africa) takes a look at the Thunderbolt.
Thunderbolt makes the LA Times.
Featured on Men's Journal.com.
Men's Health Singapore (January)
Thunderbolt features in Men's Health Singapore (January Issue).
Tim Keith of LateNightParents.com reviews the Thunderbolt.
Cyclocross Magazine's Holiday Gift Guide.
Checking out the Thunderbolt.
All Seasons Cyclist reviews the Thunderbolt.
Bike Rumor reviews the Thunderbolt.
14 Cycling-centric gifts for the Rider on your list.
Billings Gazette offers "Tips for Seasonal Gifts."
Road Bike Action (January Issue)
Road Bike Action takes a look at 7 new lights including the Thunderbolt for the winter in their latest January issue.
MTBR checks out our Thunderbolt at Interbike 2012.
Bicycle Retailer and Industry News
Bicycle Retailer and Industry News features our new Thunderbolt Headlight in their October issue.
Road Magazine features the Thunderbolt.» Road Magazine
Urban Velo goes in depth on the Thunderbolt.
Bicycle Times Magazine
Thunderbolts featured in Bicycle Times Magazine.» Bicycle Times Magazine
Coming in at #20 on "25 Back-To-School Essentials"
Coverage of our Thunderbolt Headlight in Road Bike Action.
Coverage of our Thunderbolt Headlight on Kinetic Shift.
Coverage of our Thunderbolt Headlight on Bike Rumor.