Cycplus L7 Radar Tail Light Review

by Niels Oomkes · November 1, 2025 , 6:49 am

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I have had plenty of flashing lights over my cycling career. About 10 years ago, I started adding the DRL (daytime running lights) to my bike rides. Being visible on the bike is always a concern in this distracted driving day and age. And wouldn’t you know it, I got hit by an oncoming car who turned right in front of me about 4 months ago. Now, the radar tail lights are not new, many of my friends have them, but I had not acquired one yet. The accident has definitely given me purpose to add another level of safety. ASAP! Hence, I can’t wait to see how this Cycplus 7 Radar Tail Light installs, functions, and helps my peace of mind to keep me safe and sound.

What’s Included with the Cycplus L7 Radar Tail Light

Firstly, the over-sized box contained a bunch of packing materials, and, of course, the Cycplus L7 Radar tail light. Could be a bit more efficient, but so be it. The L7 was actually flashing as I opened it which must have somehow occurred during shipping. I’m thinking it was 2-3 days since packed, but the battery was going strong. Another charge overnight, and she was good to go.

Contained within:

The Cycplus L7 Radar tail light
Seat tube mount
Seat tube rubber pad (1)
Seat tube rubber pad (2)
Short rubber strap
Long rubber strap
Seat rail mount (1)
Seat rail mount (2)
Seat rail mount spacer
Charging cable
Lanyard

Technical Details of the Cycplus L7 Radar Tail Light

Dimensions: 76.5 x 37 x 25 mm
Product weight: 67g
Detection Distance: up to 160 meter
Detection Angle: Horizontal: 20 degrees / Vertical: 10 degrees
Detectable Speed Range: 6-160 km/h
Luminous Flux: Steady mode up to 20 lm
Battery Capacity: 2000 mAh (3.7 V, 7.4 wh)
Charging port: USV Type-C (5 V, 1 A)
Wireless Protocol: ANT+ /Bluetooth 5.0
Waterproof Rating: IPX6
Operating Temperature: 0-50 Celcius
Storage Temperature: -10 – 75 Celcius

Installation Of The Cycplus L7 Radar Tail Light

With the various mounts, I think I can play around to have this L7 on a few of my bikes. I have two road bikes, a TT bike, a gravel bike, and two single speed commuters. Yes, I know that sounds like a lot of bikes, but in all honesty, five of the six get ridden quite consistently. With the straps, I should be able to easily attach and move them around, but I will likely put the mounts on a bike or two. The main commuter will get a mount for sure. My secondary old school titanium road bike will also get one, but I will use the straps for the main road bike, and the occasional TT or gravel bike. I suppose it all depends on what bike is getting the most action at the time, so that may change. Options are good!

Cycplus L7 Radar Tail Light Mounting Install

Two separate rubber mounting brackets are provided to fit a multitude of seat or frame shapes. One is more suited for round shapes while the other fits better with the oval seat stem configuration. And of course, a couple of different lengths to suit whatever bike you may have.

Testing The Cyclplus L7 Radar Tail Light

First and foremost are the various light settings you can choose.

Steady Light Mode1
Steady Light mode2
Flashing Mode
Breathing Mode

They can all be set with a brightness from low 20% to high 100%. The image below is from the app that allows me to control a handful of things including the level of brightness. I will probably stick to as bright as possible at 100% unless I am on a long ride and need to conserve the energy.

There’s a steady light for starters. It’s relatively bright and noticeable at night. I think that is a fine option, but might not draw the attention of drivers out there especially in the tricky light situations, and surrounding features. Then there is the flashing option which I do still think is the most effective. It’s a flash that will likely make an impact on the driver (distracted or not) to maybe create that moment of deeper focus. Lastly, there’s the progressive version that gets brighter on a cycle every 2-3 seconds or so. Cycplus calls it, Breathing mode which I think is very fitting. I like that one as it is good for the darker settings at night, or on cloudy hazy day. All said, the flashers will probably be my main light setting as I commute during the day.

Which bike to put this on? Now, that’s a great question. I have experimented with them on all my bikes at this point. I even had this on my TT bike during Ironman training. The issue there is that the sizing of the seat post is rather deep, and positioning the light wasn’t the most effective. That said, it’s not my main mode of pedaling, so it doesn’t matter too much. The road bike sees the most action, and I have played around with it quite a bit. The main rides are usually with larger groups, so there’s the safety in numbers approach. In the situation that others also have a radar light, there is a way for the lights to sync and flash as one for visibility.

That can be done in a ‘peloton’ setting, but I decided I don’t want to annoy the passengers behind me with a bright light. When I am riding by myself on the road bike, I will certainly use the Cycplus L7 to give me that extra bit of visibility and awareness. In the end, this is going to be my super saver on my work commutes. It’s a more casual riding style, and mainly side streets, so I have enjoyed being made aware of cars approaching well ahead of time. This gives me piece of mind, and the ability to act accordingly.

This is the most amazing bike I own. Sounds funny, right?!? It’s probably 40-50 years old, a single speed that weighs an absolute ton, but is the most fun to cruise around. I am certainly using my Cycplus L7 Radar for my work commuting miles.

Cycplus L7 Radar Tail Light Seat Post Mount

The beeping noise can get to be a bit annoying when on busier thoroughfares, as it goes off quite consistently. I suppose that’s why we have the light to alert us, but the beeping over time gets to be a bit much for me. That said, I do try to stay off of those larger thoroughfares, so the occasional alert is perfectly fine to keep me on my toes.

The amount of distance is truly awesome! I hear a beep, and for testing purposes I would look back to see where the car was, and it appeared to be several hundred yards behind me. The advertised distance is 160 meters which is a good long way. At times, I or the car would turn, and a pass is never made. And that’s ok. There were even occasions that it might have sensed cars on the side. Turns out there is a 270 degree angle where it signals as it picks up a car, so it jolted me out of my comfort zone to stay alert. I do want to reiterate that the range for the radar to pick up a moving vehicle is impressive!

: This is my Wahoo Element Bolt, and without doing a thing, the left green and red lights just showed up. The car symbol is constantly moving and at times there are numerous cars.

Something to keep in mind when you are switching between bikes. The seat tube rubber mount is not really attached to the L7 unit itself. Hence, make sure it comes with you when taking it off. I had to go to Jury duty, and took the unit with me as it was parked in a public place. In my rush to get locked up, and take my lights, the rubber mount fell to the ground without me noticing. It was still there when I got back, but I make a mental note now to check that all parts are accounted for.

A last point, I would like to make is that there is also a Brake Light Mode. Ironically, I have yet to actually see that for myself, or have been with another rider to check that out. When in Brake Light Mode, the L7 automatically activates a brake light when it detects deceleration, improving visibility and warning drivers or riders behind you when you’re slowing down.

Battery life on the Cyclplus L7 Radar Tail Light is really good as well allowing for long-distance or multi-day trips without having to think about recharging.

22 hours in 100% brightness flashing mode
Over 30 hours in 50% brightness flashing mode
Up to 36 hours in radar-only mode

Final Safety Focused Thoughts On The Cyclplus L7 Radar Tail Light

The wise and prudent thing to do for any bike rider out there is to get equipped with as much visibility as possible. Adding the Cycplus L7 Radar tail light on your bike is honestly your best option! The value is really good at around $89. Others are quite a bit more expensive, so this is a reasonable investment into your biking life. Not to make it sound too dramatic, but it could come down to that. I still have to see what the longevity looks like, but for now it is proving to be a valuable addition to my bikes. Really, pick one up, it will be worth it. For more information and purchase, please check out cycplus.com (use code AGR to get a discount) or visit amazon.com.