The Trace 4 delivers a scarcely believable 360 lumens from a 35g package, which makes it the easiest light in your life to actually remember. It lives in a jersey pocket, a rucksack lid, a saddlebag or clipped to the bars all week. USB-C charges it fully in 90 minutes. A tough CNC-machined aluminium body and an IP67 rating mean British winters are not its problem. Whether you commute through traffic or head out on faster roads at the weekend, the Trace 4 punches well above its weight.
The TraceR 4 ReAKT pays attention. It flares up when you brake and when the light around you gets brighter, then eases off for the rider sitting on your wheel. All of that comes from a 35g package delivering up to 200 lumens, charged over USB-C in 90 minutes. A CNC-machined aluminium body and IP67 rating mean it shrugs off a British winter. Pair it with the Trace 4 front light and you are properly visible, day or night, at either end of the bike.
In the box:Trace 4 DB GMB & TraceR 4 ReAKT Daybright, Seatpost Mount, Handlebar Mount, 2 x USB - C Charge Cable.
A single press of the power button while the light is off displays the battery level for five seconds, providing a quick and convenient way to stay informed and prepared for every ride. This battery status is also displayed when the light is turned off.
Size
Engineered with a sleek, adaptable form factor, it integrates effortlessly into any environment while providing exceptional performance on demand.
Side visibility
Our optically clear 270° Commute Lens enhances side illumination, ensuring you stand out from every angle on the road. Whether you’re navigating dark paths or city streets, this setup delivers maximum visibility, safety, and rider confidence.
Weatherproof
Class leading waterproof ratings mean you will never be let down in any situations, and you can always depend on your light
Weight
Delivers up to 40 hours of runtime from a product weighing only 38 grams with no compromise to strength or durability.
Engineering
Our CNC-machined 6063 aerospace-grade aluminium body is built to withstand the toughest conditions, with a scratch resistant polycarbonate front lens this light is designed to withstand all that you can through at it
Daybright Flash
Our bespoke DayBright pulse pattern is specifically designed for daylight use, making it more conspicuous than a standard pulse and visible over a kilometre away, even in the brightest conditions. With DayBright mode, you’ll be noticed. Be Seen, Be Safe.
USB-C Charging
Offers fast and convenient USB-C charging, allowing you to power up quickly and get back on the road without delays.
Frequently asked questions
ReAKT is Exposure's reactive light technology. It automatically increases the TraceR 4's output in two situations: when you brake, and when the ambient light around you gets brighter.Braking gives the vehicle behind an instinctive signal that you are slowing. The ambient light response keeps you visible in bright sun and low winter glare, which is exactly when a fixed-output rear light struggles to stand out.It works on its own, with nothing to press while you are riding.
Peloton mode senses the light of a rider following you and automatically reduces the TraceR 4's output to avoid dazzling them. It is built for club runs, chaingangs and group riding, where a bright rear light is genuinely unpleasant for whoever is on your wheel.
ReAKT and Peloton do not run at the same time, and you can switch either on or off depending on how you are riding that day.
Comfortably, yes. Rear lights work differently to front lights: the job is being seen, not seeing.
200 lumens in DayBright pulse is bright enough to stand out in daylight, while 75 lumens constant suits lit roads after dark. More output is not automatically better on a rear light, which is precisely why Peloton mode exists.
Specification comparison between products Trace + TraceR 4 ReAKT
We offer an extra year warranty to all purchases made through our site. This means you will have 3 year warranty on all of our lights and the LED’s inside are covered by a lifetime guarantee! Ensuring peace of mind with every purchase.
Our lights are designed to last a lifetime, so we carry out servicing and repairs on lights well beyond the warranty period - simply get in touch if you ever need us - we've got you covered!
Customer Reviews
Overall rating: 4.9 / 5 from 451 reviews.
Trace 4 Front light performs superbly!! Compact size, easy to remove and easy to interact with while riding.
The bracket for my TraceR fits perfectly! Thanks to Exposure team for the support before purchasing.
I lost my old TraceR rear light after making, what in hindsight, was a poorly made mount to go on my pannier rack. I was gutted for days after, as it was still going strong after years of daily commuting and many road rides! I looked at countless reviews and specs. of other light brands, hoping to try out some new exciting tech.
I eventually came back to Exposure, as something in my head kept saying "Don't compromise on quality, get the best!" I'm glad I did. The Trace front light will primarily live on the road bike and is a perfect balance of form and function without the need for a bigger light during the day. The TraceR 4 React rear light is also a fantastic balance of everything you could need. This rear light gives me confidence in any situation, especially commuting through busy traffic, daily, on my cross bike with a pannier rack. The additional side clip brackets are, great quality, strong and give me the mounting options that I need. The only slightly awkward quirk is having to pull down the rubber sleeve to charge the lights and then reposition it. Having said that, I have strangely enjoyed this quirk for many years on the previous generations. 😄
Great service from the team at EXPOSURE who quickly dispatched a Tracer 4 for my trip, much appreciated. Great little lamp for early starts and unlit alpine tunnels.
An excellent wee light. The mount proved rock solid over some pretty rough terrain on a recent bikepacking trip.
It was great to know that I had a really bright rear light for the road sections. The long battery life also meant I didn't have to worry about charging for the duration of the four day trip.
The usual exceptional quality from exposure.Small,light and powerful for daytime use.If your looking for all the traits mentioned this is the light to buy.
Brilliant little light made well with proper materials! The shape and size of the aluminium body is a thing of beauty. If it weren’t on my bike I’d put it on a shelf to look at. It’s very bright and the flash pattern stands out in traffic well. I have’nt used the beam in unlit areas yet so can’t comment on that, but it’s not really designed for that sort of use I guess. However, I’m fairly sure it will be a lot better than the crappy Chinese lights I was using previously. It’s a tiny, compact unit that you forget is even on your bars!!
Having done quite a bit of research on front lights, this one seemed to have the best reviews and it doesn’t disappoint. It fits nicely on my TT base bar ( I did also buy the fitting for my aero extensions, I haven’t needed to use it ) it’s compact and very bright