It was 2:47am somewhere between Liège and Luxembourg, kilometre 412 of a 600km brevet, and my front light flickered. Not a full failure. Just that awful half-second blink that makes your stomach drop through the floor. I had a backup (I always do), but standing by the side of a pitch-black Belgian country road with dead legs and a rattled brain, I made myself a promise: I would never again treat lighting as an afterthought on an ultra event. Exposure Lights, together with Ravemen, who make what I consider the gold standard in ultra distance cycling lights, have a quote on their website that sticks with me: “Ride further, ride safer.” Simple. True. Everything.
Generic “best bike lights” round-ups miss the point entirely when it comes to ultra cycling. They’re written for commuters, Strava hunters, weekend club riders. What you need at kilometre 300 of an all-night event is a completely different beast. You need a system, not a gadget. This guide is specifically about ultra distance cycling lights: what to buy, how to set them up, how to plan your battery strategy, and the mistakes I see riders make again and again at ultra distance events, challenges and brevet starts across Belgium and beyond.
I’ve ridden close to 30,000km per year for years. I’ve done the UBF Pyrénées 500, multiple Everestings, long brevets, and a personal record of 630km in a single 24-hour effort. Lighting has been central to almost all of it. Here’s everything I know.
Why Ultra Distance Cycling Lighting Is a Completely Different Game
Let’s be honest about what standard bike light reviews test: they switch the light on in a dark room, measure lumens, run a timer, and call it a day. That’s fine for a commuter choosing between two ã50 lights. It’s useless for someone riding through the night for 12, 15, or 20+ hours on open roads with no street lighting, no service stations, and legs that stopped cooperating somewhere around hour 10.
Ultra distance cycling lights need to satisfy three completely non-negotiable requirements:
- Burn time — How long before you’re riding blind? Not in “turbo mode” burn time. Realistic, sustained output burn time.
- Output — Can you see the road properly at 40km/h on a downhill with potholes you haven’t seen before?
- Redundancy — What happens when the primary fails? Because at some point, something will fail. Always.
Belgian roads are not kind to equipment, and I mean that literally, cobbled farm tracks, unmarked junctions, gravel shoulders that end without warning. At speed in the dark, inadequate lighting isn’t just uncomfortable, it’s genuinely dangerous. I’ve seen riders pull out of brevets at 3am not because of legs or nutrition but because their lighting situation fell apart. Don’t be that rider.
Front Ultra Distance Cycling Lights: Building Your Primary System
The Lumens vs. Burn Time Trade-Off Nobody Explains Properly
Manufacturers love advertising peak lumens. It’s a big number and it sells lights. But peak lumens is almost always a “burst mode” figure that drains a battery in 90 minutes. The number you actually care about for ultra distance is sustained output at mid-power, and the burn time associated with that specific mode.
In practice, for ultra distance night riding, I want a primary front light capable of 1000–1200 lumens sustained, with a realistic burn time of at least 6–8 hours at that output. Drop below 800 lumens on an unfamiliar road in the dark and you’re not really seeing enough. Push above 1500 lumens for hours and you’ll be reaching for a power bank before sunrise.
The ultra-distance sweet spot is a quality light on its “high” setting (not max, not eco) running all night. Know your light’s actual runtime at that specific mode, not the manufacturer’s best-case figure. Test it at home first. Time it yourself.
Front Light Recommendations from Real Ultra Kilometres
Exposure Lights (Diablo, Six Pack, Maxx D) are the benchmark. They’re made in Britain, they’re not cheap, and they absolutely earn every euro. The Diablo gives around 6–8 hours at its highest sustained setting, the beam pattern is wide and road-focused (not a spot beam like some commuter lights), and the build quality is exceptional. I know riders who’ve completed the Transcontinental Race and RAAM with nothing else on the front. There’s a reason the ultra endurance community keeps coming back to this brand.
ROCKBROS 3000LM — this is the Chinese brand the ultra-cycling community is massively sleeping on, and my current secondary front light of choice. 3000 lumens peak output sounds almost absurd until you’re descending an unlit mountain road at 2am and you want to actually see what’s coming. I run it on its medium setting (around 1200 lumens), which gives me a solid 6–7 hours of comfortable road visibility and a beam pattern that genuinely illuminates the road surface rather than blasting at the hedgerows. USB-C rechargeable, solidly built, and costs a fraction of the European alternatives. For the price, it’s remarkable and it’s never once let me down on a night stage.
Front light and external battery combi
Ravemen FR500 — one of the cleverest pieces of kit in my entire ultra setup, and not just because it delivers a clean 500 lumens as a backup front light. What makes the FR500 genuinely special for ultra distance is that it doubles as an external battery pack. When your GPS is dying at 4am on a remote stretch between checkpoints and the nearest shop won’t open for four hours, you plug directly into the FR500’s USB output and charge on the move. That dual functionality, reliable backup light and emergency power bank, means it earns its place on the bike twice over. For overnight events, it’s a no-brainer addition to the system.
The rule for ultra events: minimum two front lights, always. One primary, one backup. If you’re going to be in the dark for more than four hours, there is no argument for a single-light setup. None.
Rear Ultra Distance Cycling Lights: The Ones That Actually Keep You Alive
Front lights get the glamour. Rear lights save your life. On a solo overnight brevet through rural Belgium or the Pyrénées, you are sharing roads with trucks at 4am, with farmers heading to early markets, with drivers whose attention is nowhere near where it should be. Your rear visibility is not optional.
My absolute non-negotiable: the Garmin Varia RTL 516. Yes, it’s expensive. No, I don’t care. The radar function is transformative for solo ultra riding. Knowing that a vehicle is approaching from 140 metres behind you, before you can hear it, before you can see its lights, changes how you ride. You have time to move right, to be deliberate, to not get caught mid-lane when a truck overtakes. My Wahoo alerts me with a beep and a bar at the bottom of the screen. It’s become as essential to my ultra setup as my GPS unit.
Good Garmin Alternative
If the Varia is out of your budget or you want a serious alternative, the Wahoo Trackr Radar is worth knowing about, and I say that as someone who owns both. The Wahoo integrates seamlessly with Wahoo head units (naturally), has a strong rear light, and the radar performance is comparable to the Varia. My honest take: if you’re already in the Wahoo ecosystem, the Trackr is the obvious choice. If you run a Garmin head unit, go Varia. Either way, radar is no longer a luxury for solo ultra riding. It is a system upgrade that changes how safe and relaxed you feel on open roads at 3am.
For the backup rear light, I’m a big fan of the Ravemen CL01. It’s compact, seriously bright for its size, and clips on securely. The flashing modes are visible from a long distance even in daylight, and the build quality is well above what you’d expect at the price. I mount it on the seatpost below the Varia and it runs all night without complaint. The redundancy of having two independent rear lights, one with radar, one purely focused on being a bright, reliable flasher, gives me genuine peace of mind on fast open roads.
Helmet Ultra Distance Cycling Lights: The Overlooked Weapon
Ask most cyclists what they run for ultra distance night riding and they’ll list their handlebar lights and maybe a rear light. Ask the experienced ultra community and almost everyone has a helmet light in the mix too. It’s one of those things you don’t understand until you try it, and then you can’t imagine going back.
The reason is simple: your handlebar lights illuminate where the bike is pointing. Your head is already looking where you want to go, around the corner, at the junction, at the road surface ahead of a turn. A helmet light follows your gaze. On winding descents in the dark, that’s not a luxury, it’s a safety system.
My current helmet light is the BioLite Dash 450. It is a compact rechargeable headlamp that I’ve adapted for helmet use and genuinely love. At 450 lumens in high mode it more than does the job, and the USB-C charging means one less cable type to manage on a long event. The beam is tighter and more focused than you’d expect from a headlamp, which actually suits cycling perfectly. It cuts into the distance rather than washing everything in a broad flood.
I strap it directly to my helmet strap and it follows my gaze naturally on those tight switchback descents where the handlebar lights are pointing at nothing useful. Battery life on medium mode takes me through a full night without anxiety. It doesn’t need to be a powerhouse. It is supplementing the main lights, not replacing them. But at kilometre 500 when your reactions are not what they were at the start, having a beam that goes where your eyes go is the kind of margin that matters.
Dynamo Lighting — The Ultra Distance Secret Weapon
I want to talk about something the generic round-ups almost never cover properly: dynamo hub lighting systems. For randonneuring and self-supported ultra events, this technology is a genuine game-changer, and in my view, it’s the most underrated setup in all of ultra distance cycling lights.
A dynamo hub, a SON 28 or Shimano DH-series are the go-to choices, generates electricity from wheel rotation and powers your front light permanently. No batteries. No charging stops. And no range anxiety. The light is on when the wheel turns. It goes off when you stop. The physics are elegant and the reliability is extraordinary.
Pair a dynamo hub with a Busch & Müller IQ-X or Luxos U headlight and you have a legal, powerful, StVZO-approved (important for European events) light that will never run out. The Luxos U also features a USB output to charge your GPS or phone while riding, which for a 600km brevet is genuinely priceless. As I covered in my 2026 ultra season preview, I’m running a dynamo setup on my dedicated brevet bike this year for exactly this reason.
The trade-offs are real: there’s a small drag penalty (modern hubs are very efficient, the SON 28 produces negligible resistance above 15km/h), the upfront cost is significant, and you’re committed to that wheel build. But for a dedicated ultra/randonneuring bike? Absolutely worth it. Set and forget is exactly what you want at 3am with 200km still to go.
Battery Strategy: Planning for the Long Night
Most riders don’t think about this until they’re in trouble. Here’s a simple framework I use to plan every overnight event.
Start with the hours of darkness. For a summer brevet starting at 6am, you’re looking at darkness from roughly 9:30pm to 5:30am, call it 8 hours. Add 1–2 hours of dusk and dawn where you still need lights running. You’re planning for 10 hours of lighting.
Front lights: If your primary sustains 8 hours at 1000 lumens, you need one recharge cycle or a second light ready. I carry a 10,000mAh Anker power bank specifically for lights in my top tube bag. Most modern lights charge via USB-C and can top up in 2–3 hours while still mounted and running. Plan a coffee stop around hour 6 or 7 and plug in. Simple.
Rear lights: The Garmin Varia runs 6–16 hours depending on mode. I set it to the medium flashing pattern (not solid, not pulse) and get about 10 hours. For longer events, I carry a small spare battery cable that plugs into the Varia’s USB port for an emergency top-up.
The golden rule: always carry 30% more battery capacity than your calculation says you need. Weather delays, mechanical stops, wrong turns, a longer night than expected. Everything takes more time than planned in ultra cycling. Plan conservatively and you’ll never be scrambling in the dark.
My Full Lighting Setup for Ultra Events
For completeness, here’s exactly what I run on events like the UBF Pyrénées 500 or a 600km brevet:
- Primary front: Exposure Diablo (handlebar mounted, mid-power mode)
- Secondary front: ROCKBROS 3000LM (second handlebar mount, medium setting)
- Backup front / emergency power bank: Ravemen FR500 (jersey pocket or bar bag — light + USB out)
- Helmet: BioLite Dash 450 (strapped to helmet, medium mode all night)
- Primary rear: Garmin Varia RTL516 (radar + light — or Wahoo Trackr Radar depending on which head unit I’m running)
- Secondary rear: Ravemen CL01 (seatpost mount, always flashing)
- Power: 10,000mAh Anker power bank, USB-C cable in top tube bag
- Spare: One extra USB-C cable and a zip tie in the saddle bag
Total system weight: around 420g including cables and power banks. For the insurance it provides over 12 hours of darkness, I’d add double that weight without hesitation.
Common Mistakes — And How to Avoid Them
Single light dependency is the most common. One front light, one rear, no backup. One failure and your event is over or worse, you’re on a dark road with no visibility. Always two minimum.
Running max lumens all night. You’ll burn through your battery in 2–3 hours and spend the next 8 hours on eco mode squinting at the road. Use mid-power. Save full output for fast descents when you genuinely need it.
Forgetting spare mounting hardware. A cracked GoPro adapter or a loose Garmin mount at 3am is a disaster. I carry two spare rubber bands (they hold most lights in a pinch), a small bit of electrical tape, and a zip tie. Weighs nothing, has saved me twice.
Ignoring waterproofing ratings. Belgian weather is not your friend. IPX5 minimum for anything mounted on the bike, IPX6 or better if you want real confidence. The Exposure Diablo is IP67 rated. That’s the level of trust I want in a primary light.
Not testing before the event. Run your full lighting system for a real overnight or early-morning training ride before your target event. Discover the problems on a training ride, not at kilometre 250 when it matters.
Verdict: Invest Properly, Ride Confidently
Ultra distance cycling lights are not a place to cut costs. Your ability to see the road, to be seen by other road users, to continue your event safely through hours of darkness. These are worth a proper investment. The total cost of my lighting system is not trivial, but when I’m at kilometre 500 at 4am and everything is working perfectly, it’s worth every single euro.
Start with a quality primary front light (Exposure if you can, ROCKBROS if budget is a factor), add a backup front like the Ravemen FR500 that doubles as a power bank, get a Garmin Varia or Wahoo Trackr Radar on the back with a Ravemen CL01 as your second rear, slap a BioLite Dash 450 on your helmet, and carry a power bank. That’s the template. Everything else is refinement.
The ultra-cycling community often overlooks lighting in favour of obsessing over frame weight or wheel aerodynamics. But at 3am on a dark country road with 200km still to go, it’s not your carbon frame that matters. It’s whether you can see where you’re going.
Have you built a lighting system for overnight or ultra distance riding? Drop a comment below. I’d love to hear your setup and what’s worked for you.
