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Serfas Thunderbolt Tail Light

Item #: LS244A12
USD$40.00
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Serfas Thunderbolt Tail Light

Serfas Thunderbolt Tail Light

The Serfas Thunderbolt (UTL-6) Taillight gives you style and safety in one high- powered and affordable package. This USB rechargeable light comes with 35 lumens of firepower while giving riders’ several different rear facing mounting options. The Thunderbolt makes you visible up to 1 mile away, which will help keep you safe in the concrete jungle.

Serfas Thunderbolt Tail Light Features

  • Can be seen 1 mile away
  • Steady and flashing modes
  • Run time: Up to 9.5 hours in Low Blink mode
  • Modes: High Beam, Low Beam, High Blink, Low Blink
4.9 / 5.0
16 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Stars
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Serfas Thunderbolt Taillights
I use several of these tailights and have found them to be very adaptable for use on various areas of the bike frame. I also have one mounted on the rear of my helmet. The elastic bands used to secure them hold the units very well. The only drawback to these lights is that they have to be removed to recharge them. For me, this is no big deal. The lights are extremely bright -the brightest I have found. The charge lasts about 3 hours on full solid beam or about 5 hours on the flash pattern settings. I love these lights as I often take 50-60 mile rides during the evening hours, often return at dusk or shortly after dark. They also provide an excellent taillight for daytime use.

PROS: 3 Can Be Used On Helmet, Rechargable, 4 Fast Recharge, 2 Great Visibility, Long battery life, 1 Excellent Adaptabilit

BEST USES: Night commute, Bike Frame And Helmet Mou, Rear safety light
February 9, 2014
Location:
Reynoldsburg, Ohio
Makes For A Great Patrol Bike Light
--This light is used on the seat post of a Badboy 1 police patrol bike and it looks like it came from the factory . It looks awesome, on or off.
--This light is great because it provides an uncompromised and exceptionally bright light that can easily be seen by others. It's off-axis visibility is crazy good and I actually have to run it on the reduced power flash, because the old people where I work say that it overwhelms them as they approach me when the light is on high.
--Yes, these lights are not cheap, but truly you are buying a super-decent light that seems very robust, well-designed, efficient, and the ribbon design just looks awesome. I cannot wait to see future designs, as LED technology is awesome.
--My only negative is that I wish that the charging adapter had a micro USB head instead of the mini USB. Micro USB is what 99% of non-proprietary Android cell phones use, which I have many of. Mini USB is so 1990's. My NR light is Micro USB and I can charge it anywhere, even if I need to borrow someone's charger. Only the really old guys with flip phones have the Mini USB chargers.
--I am also using this on the back of my R1200GS and it's equally effective. I own the headlight too and it's just as nice, especially as a patrol light/marker, not as a primary headlight.

PROS: Rechargable, Low battery indicator, Great visibility, Long battery life

BEST USES: Rear safety light, Night commute, Trail riding
November 17, 2013
Location:
West Palm Beach, FL
Amazing
This light is super bright and easy to install. One of the biggest selling points of this light is that the brightness does not change with minor changes in viewing angle like it does with some other lights. With my old tail light, if you saw if from even a few degrees off from straight on, the brightness was much less. Not so with this light. Another plus is that when the mounting rubber bands eventually break on this light, you can just replace them with regular rubber bands. You can't do that with many other lights. Add to that the rechargeable battery and this light is a winner. The only thing I would change would be to give it a faster flash mode.

PROS: Great visibility
July 5, 2013
Location:
Cincinnati, OH
Can be seen for miles!
Quality rear light that has a high visibility in all weather and has long battery life. Recharging is easy with a usb cable that can be plugged into your computer or a usb wall charger.
June 30, 2017
Purchased
9 months ago
Location:
Bay Area
My favorite rear light...
I use this light for night rides around the city of Dallas. Absolutely the brightest and most visible tail light I've ever used.

PROS: Four Light Modes, Long battery life, Rechargable, Low profile, Great visibility, Side visibility

CONS: None

BEST USES: Rear safety light, Night commute
December 4, 2015
Location:
Richardson, TX
Very bright
I was pleasantly surprised with the quality and visibility. I use this light for night time commuting and it's absolutely perfect.

PROS: Long battery life, High Quality, Rechargable, Great visibility, Easy mount

BEST USES: Rear safety light, Night commute
October 23, 2013
Location:
PNW
Good Product
Good product for visibility

PROS: Great visibility, Rechargable, Long battery life

BEST USES: Rear safety light, Night commute
October 6, 2015
Location:
40701
Bright, Easy to Charge, Stays Put
I put mine on my left rear triangle and it stays put even bouncing over 80 miles of washouts and rough gravel roads.

PROS: Rechargable, Great visibility, Long battery life
June 13, 2016
Location:
Great Bend, KS
Super Bright!!!
Super bright. Easy to mount. 4 settings, 2 steady and 2 flashing.

PROS: Rechargable, Long battery life, Great visibility

BEST USES: Trail riding, Night commute, Rear safety light
January 26, 2016
Location:
Wisconsin
Nice light
Very bright, easy and quick to install, small, and other than the lens it's flat black so on a black seatpost it's not very visible. I'm hoping that means it won't get stolen.

PROS: Flat Black Incognito, Long battery life, Great visibility, Rechargable

BEST USES: Night commute, Rear safety light
October 8, 2015
Location:
Washington, DC

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Free Shipping Offer

Get free Standard Shipping with your $50 purchase today! Just choose Standard Shipping during checkout.

Please note this offer is only available to physical shipping addresses in the 48 continental United States (no PO Boxes), and oversize charges still apply on some heavy/large items.