Your ultimate guide to bike lights for road cycling Oct 2026
Your ultimate guide to bike lights for road cycling Oct 2026 (Image Credit: Farrelly Atkinson)

Your ultimate guide to bike lights for road cycling — see and be seen with our selection of the best for your bike

A set of quality bike lights will help you see and be seen at the front and rear. Browse our selection to decide which lights are ideal for you and your riding
Sun, Oct 25, 2026 09:00
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Even if you rarely ride in the dark, a set of decent bike lights is a must for all cyclists. In this guide, we’ll help you choose from some of the best front and rear bike lights, and offer some handy tips to help you choose the right type and price point for your needs. 

Ravemen CR450 USB Rechargeable front light
Best front bike light under £50: Ravemen CR450 USB Rechargeable front light
Cycliq Fly12 Sport front bike light
Best front light with a camera: Cycliq Fly12 Sport
Exposure Sirius 11
Best all-rounder front light: Exposure Sirius 11
Ravemen K1800
Best front light for under £100: Ravemen K1800
Exposure Zenith 4
Best helmet-mounted light: Exposure Zenith 4
Supernova E3 Pro 2 dynamo front light
Best dynamo front light: Supernova E3 Pro 2 dynamo front light
Lezyne Strip Pro Ai Alert 400+ Rear Light
Best rear light for brightness: Lezyne Strip Pro Ai Alert 400+ Rear Light
Oxford Ultratorch Slimline R50 Rear LED
Best value rear light: Oxford Ultratorch Slimline R50 Rear LED
Best rear light with a camera: Cycliq Fly6 Pro Bundle
Moon Helix Sense (150lm)
Best rear light for under £50: Moon Helix Sense (150lm)
Garmin Varia Rearvue 820
Best rear light with radar: Garmin Varia Rearvue 820
Coospo TR70 Smart Radar Tail Light
Best radar rear light for value: Coospo TR70 Smart Radar Tail Light

If you’re returning to cycling after a very long hiatus, you’ll be pleased to know that bike lights have come a long way this century. The rechargeable LED light is now king, and unlike the notorious Ever Ready lights that were popular in the ’70s and ’80s, you don’t need to spend a fortune on batteries to get your feeble beam to work for a couple of hours.

Nowadays, you can pick up front lights that can illuminate an unlit path like it’s daytime, rear lights with various different settings that can be as bright as car tail lights, and they’re all relatively inexpensive. There’s also dynamo lighting that converts the energy from your wheel into charge for your lights so you never need to recharge them from the mains, and even lights that double up as action cameras.

Though most modern bike lights are very versatile, there are a couple of things to think about when purchasing a set of bike lights to make sure they’re suitable and compatible with your bike.

Mounting options

First, check how they mount: does your bike have a non-standard seatpost that is aero-shaped, or anything other than round? Go for a rear light with a flexible mounting system, as a hard plastic round mount won’t fit. The same goes for the front, as if your handlebars are integrated and flat in the middle, it could be difficult to mount most front bike lights.

Brightness

You should also consider what environments you will be riding in and how much power you’ll need (more on that in a minute). If you only ride on roads and never really stray onto unlit paths, you won’t need to splash out on any front lights that are suitable for trail use. The sheer number of lumens isn’t everything, as beam shapes have a big influence on how dazzling lights can be, but you’re unlikely to need a front light with more than 800 lumens as the max setting if you only ride in town; even then, the highest setting will rarely need to be deployed.

Modes and features

Consider what settings you will need. Most modern bike lights come with a number of steady, flashing and pulse modes, so go for some that have options if you’re not sure what is best. A popular combination is a steady front light with a rear light on flash mode in urban environments; although, use your judgement to decide on how bright your rear light needs to be if you’re running it on flash. Dazzling drivers and other cyclists doesn’t really improve anyone’s safety, so get a second opinion from friends or relatives if you’re in doubt about how bright your beams are to others.

Make sure the lights you choose are intuitive and easy to use, particularly if you anticipate you might need to switch settings on your front light quite often. If you ride year-round you’ll want the buttons to be easy to use even wearing thick gloves, and lights that allow you to toggle between high and low modes easily are a good option if you want to pass other cyclists politely without dazzling them.

Battery life

Any light worth buying nowadays is rechargeable via USB (we only recommend rechargeable lights in this guide, other than our dynamo option), so runtime is less important for most cyclists nowadays; but of course, if you plan on doing multi-day adventures without access to electricity very often, you’ll want lights with decent battery life unless you go down the dynamo route.

Bear in mind that these are our top picks, front and rear, from a rather large archive of bike lights we’ve reviewed and beam-tested over the years; so if you want to refine your search, you can always check out our more detailed guides to the best front bike lights and best rear bike lights, as well as our reviews section on front lights and rear lights. 

Explore our handpicked selection of the best bike lights available right now below, along with a helpful Q&A section to answer some of your bike light questions. Want to know more about how we review products and put our buyer’s guides together? Check out this article for a full explanation, so you can feel confident in our recommendations – especially when it comes to your safety out on the road.

To further help you inform your choice when deciding on a front light, we’d also recommend checking out the very handy road.cc Beam Comparison Engine, which allows you to see still images of the beam shapes as they would look when mounted to your bike.

Right then, let there be light(s).

The best front bike lights

Ravemen CR450 USB Rechargeable front light
Ravemen CR450 USB Rechargeable front light (Image Credit: Farrelly Atkinson)

Ravemen CR450 USB Rechargeable front light

Best front bike light under £50

Long burn-times on pulse settings

Remote switch

Small and light

Remote switch doesn’t allow you to switch the light on or off

Short burn-time on high

Ravemen’s CR450 is small, light and runs for a long time on the lower lumen setting and flashing/pulsing settings. It has a rather useful remote switch and you can even keep using it while it charges from a battery pack.

It weighs in at just 105g, and the wired remote switch attaches to your handlebar with a rubber o-ring. While it’s certainly not the brightest light you can buy, for being seen this light is well worth it for the reasonable price, and is bright enough on high to see by on dark lanes. As mentioned already, it also has useful extra features.

Cycliq Fly12 Sport front bike light
Cycliq Fly12 Sport (Image Credit: Farrelly Atkinson)

Cycliq Fly12 Sport

Best front light with a camera

Not too bulky

Decent daytime light

Easy to use

Quality footage

Non-replaceable battery

Run-times not outstanding, particularly in cold weather

The third generation of the Fly12 Sport from Aussie brand Cycliq is easy to use with quality footage and almost everything you’d want for an ‘incident capture’ camera.

The light is slightly less powerful than the previous generation, but it’s still fine for road riding at 400 lumens, and this means the Fly12 Sport is now lighter and more compact than ever, at just 151g.

Mounting above or below then handlebar, mounting is easy and operation is simple enough via three side buttons. It comes with a 64GB card for storing footage, and you can also take photos with the touch of a button as well as record your footage.

The run-times and battery life aren’t outstanding, but if you want a camera to record your rides and capture any incidents, the Fly12 Sport is among the best out there currently.

Exposure Sirius 11
Exposure Sirius 11 (Image Credit: Farrelly Atkinson)

Exposure Sirius 11

Best all-rounder front light

Superb build quality

Very bright for its weight and size

Long warranty and lifetime serviceability

Flashing modes offer great battery life

Designed and manufactured in the UK

Gets hot in 1300 lumen mode

Takes about three seconds to indicate the correct battery level

The Exposure Sirius 11 is right up there among the best bike lights on the market. Its combination of high-lumen output, excellent DayBright pulse modes, class-leading flashing runtimes, low weight, and long-term serviceability makes it a superb choice for both road cyclists and commuters.

Despite being small and light (just 98g), the Sirius 11 can belt out 1,300 lumens, and it offers 270° visibility. The build quality is high, with a CNC-machined aluminium outer shell, and you get three program sets, with three output modes in each. This is a really strong all-round option.

Ravemen K1800
Ravemen K1800 (Image Credit: Farrelly Atkinson)

Ravemen K1800

Best front light for under £100

Bright modes

Can be used while charging

Doubles as powerbank

Good battery life

IPX7 waterproof rating

Sleek design

Wireless remote switch

Mount can move over rough ground

The Ravemen K1800 front light is a great option that provides up to 1,800 lumens and good runtimes. The seven modes cover both night and day use, and the IPX7 waterproof rating means you can be confident that no rain will get in.

The K1800 is easy to operate, and the top setting is impressively bright, providing excellent visibility on unlit roads for 1:30 hours before switching to a lower constant setting for 30 minutes. Even the medium and low settings provide great visibility.

If you don’t need this level of power, we were equally impressed by the Ravemen K1000.

Exposure Zenith 4
Exposure Zenith 4 (Image Credit: Farrelly Atkinson)

Exposure Zenith 4

Best helmet-mounted light

Powerful beam, depth, and spread

Great battery life

TAP function is excellent

The price

The Exposure Zenith 4 is designed for mountain biking and gravel riding rather than the road, and it provides a whopping 2,360 lumens.

Runtimes range from an hour right up to 36 hours, and the 150g weight is perfectly comfortable for extended periods.

The Zenith’s three LEDs create a bright, concentrated beam that’s very impressive, and you’re rarely likely to need the most powerful setting except on the most technical of trails.

Supernova E3 Pro 2 dynamo front light
Supernova E3 Pro 2 dynamo front light (Image Credit: Farrelly Atkinson)

Supernova E3 Pro 2 dynamo front light

Best dynamo front light

Easy to fit

Fit and forget

Near-perfect beam pattern

Remote switch doesn’t allow you to switch the light on or off

The ES Pro 2 hasn’t really changed in many years, and neither should it: this is still one of the most reliable dynamo lights we’ve come across, and if you’re into long-distance bikepacking or audax riding, it should be high up your wishlist when choosing a light that works off your own steam.

The beam is a German road-legal one that directs 95% of the light downwards to avoid blinding oncoming traffic, and once you’re over about 5mph the beam holds steady. We found the beam pattern to be more or less ideal for road riding, with the majority of the light concentrated directly ahead of you but still enough throw for picking out turns and suicidal rodents in the verges.

If you don’t care for worrying about whether or not your light is charged, this is a great option.

More great front lights

Giant Recon HL 350
Giant Recon HL 350 (Image Credit: Farrelly Atkinson)

Giant Recon HL 350

Good run and charge times

Lightweight and compact

Easy to attach and remove

Inexpensive

Battery level display not great

Doesn’t integrate with Garmin

The Giant Recon HL 350 is a brilliant front commuter light to ‘be seen’ while also delivering a decent level of brightness on its highest setting. The light really comes into its own in towns and suburbs but the full-power beam is sufficient to see even on dark roads if you end up going the long route on your commute home.

It has three steady modes and two flashing ones all with good run times. Full power at 350 lumens lasts close to two hours, the lowest steady mode of 100 lumens lasts around 6 hours and flashing mode takes it up to about 12 hours.

The Recon HL 350 is USB rechargeable, IPX7 waterproof and mounts to the bar with a straightforward strap. Side windows spill light for visibility at junctions too, all in a compact lightweight package.

Exposure Race 19
Exposure Race 19 (Image Credit: Farrelly Atkinson)

Exposure Race 19

Powerful

Excellent build quality and thoughtful features

Secure mounting and robust construction

Size and weight make it a substantial presence on the bars

Expensive

No side visibility

The Exposure Race 19 might not be cheap, but it is well made, offers a good beam pattern, and can be fixed in place either above or below your handlebar. It’s an impressive piece of kit that performs extremely well.

As usual with Exposure, the build quality is superb, and the maximum output of 2,650 lumens means you get enough light for gravel and mountain biking at night, although the recessed lens means there’s no real side visibility.

You can tailor the output to suit your riding and how long you need the battery to last.

Brightside Topside Helmet Light
Brightside Topside Helmet Light (Image Credit: Farrelly Atkinson)

Brightside Topside Helmet Light

User-friendly

Surprisingly bright

Well made

Charge cable rather short

This front and rear combination light is affordable with generous run times and decent output, and can be used as a secondary light on yur helmet or a ‘get-me-home’ emergency light on your bars.

You get seven modes, with 50 lumens/100 lumen flash at the front and 30 lumens at the rear. Charging is via USB, and although it weighs just 70g, the light proved secure and durable for our reviewer after months of heavy use.

Exposure Joystick
Exposure Joystick (Image Credit: Farrelly Atkinson)

Exposure Joystick

Repairability

Program modes

Size and weight

Beam pattern

Slow charging

Price

If there was ever One Light To Rule Them All, it would be the Exposure Joystick and whilst there are cheaper options, our reviewer thinks that it’s well worth the money.

We’ve been reviewing Joysticks since at least 2012 when the Mk6 got 4.5/5 stars for its 325 lumens, £165 cost and three-hour run-time and at 98g. We last reviewed the Mk17 but now Exposure is up to Mk18 which comes with up to 1200 lumens and run-times of between 1.5 hours and 36 hours.

Overall, the Joystick is solid, rugged, beautifully made and performs brilliantly out on the trail or road, day or night.

Knog Bilby
Knog Bilby Headlamp (Image Credit: Farrelly Atkinson)

Knog Bilby Headlamp

Huge range of options

Long run-times

Bright

Lightweight

Fun design

Recharging tab position

Overcomplicated

This head torch isn’t in the latest Knog range but it’s still available through some retailers. It is feature-loaded, rechargeable and has plenty of features and functions.

Weighing just 88g, the Bilby is super comfortable to wear and easy to adjust. Our reviewer found he could sneak it on his forehead just below a helmet, although it’s important not to compromise your helmet’s position here. At the max 400 lumens output, it should last you over five hours, although we found it could run for as long as nine hours.

The Bilby is light, bright and typically Knog-ish in that it comes in various bright colours (or grey or black if you’d prefer) and is a bit different to the norm. The sheer range of lighting options can make it bewildering, but once you get to grips with it, it’s impressive.

Our favourite rear lights

Lezyne Strip Pro Ai Alert 400+ Rear Light
Lezyne Strip Pro Ai Alert 400+ Rear Light (Image Credit: Farrelly Atkinson)

Lezyne Strip Pro Ai Alert 400+ Rear Light

Best rear light for brightness

Bright

Easy to mount

Excellent run times

Great waterproofing

AI? Kind of, I guess

Brake sensing quite angle-specific

The Lezyne Strip Pro AI Alert 400 is an excellent rear light that’s easy to fit and pushes out some serious lumens for a long time. It also offers a decent braking function. 

The Strip Pro AI Alert 400 has a wide 270° field of visibility, and the 400-lumen day ‘highly disruptive’ flash mode is really bright. You get seven modes, all the way down to 5-lumen Femto mode, which lasts for 80 hours. On its 80-lumen constant output, which is a lot of rear light, you get five-and-a-half hours.

This is a high-quality rear light that’s easy to fit, bright, impressively waterproof and has great runtimes. What more do you need?

Oxford Ultratorch Slimline R50 Rear LED
Oxford Ultratorch Slimline R50 Rear LED (Image Credit: Farrelly Atkinson)

Oxford Ultratorch Slimline R50 Rear LED

Best value rear light

Easy fitting

Decent performance

Great value

Not as bright as some

If it’s simplicity you want and you want a good deal, look no further than the Oxford Ultratorch Slimline R50. This design has been around for years; it’s easy to fit, great value and offers decent performance for the money.

The bracket is a simple rubber wedge that fits to the back of the unit, held on by a rubber band. It won’t fit aero seatposts, but for the rest of us it’ll work just fine. 50 lumens is quite a lot for a rear light, and plenty to use it as your main rear light. The weight is just 27g, and battery life is from two hours on the highest steady setting up to 23 hours on the lowest pulse mode.

This simple rear light does the job of making sure you’re seen, with ample light output, good mode choices and easy operation.

Cycliq Fly6 Pro Bundle (Image Credit: Farrelly Atkinson)

Cycliq Fly6 Pro Bundle

Best rear light with a camera

Good rear light

Weatherproof

Easy to use

USB-C charging

Excellent quality footage

Buttons are flat and hard to find

It’s a big unit

Price

The Cycliq Fly6 Pro combines a rear-facing camera and bike light, offering video recording in 4K and 100-lumen output. The video resolution is excellent for capturing details in case of an incident, and the device is easy to use with Wi-Fi transfer simplifying footage viewing.

The bundled package being reviewed here includes the Fly6 Pro unit with a 64GB microSD card, a USB-C cable for charging and transferring files, a safety tether, mounting bracket, two mounting straps, and four bracket adapters. The Fly6 Pro unit is also available to purchase on its own, currently priced at £329.

Moon Helix Sense (150lm)
Moon Helix Sense (150lm) (Image Credit: Farrelly Atkinson)

Moon Helix Sense (150lm)

Best rear light for under £50

1.5 hours eco mode when battery reaches critical limit

270 degree visiblity

Lightweight

Responsive and effective braking sensor

Potential for 130 hours run time

Two handed job to remove from bracket

Solid light modes could be longer

The Moon Helix Sense 150’s output is impressive, runtimes are good, and recharging via the USB-C port is quick.

You can get up to 130 hours of use in the flashing 5-lumen mode, through to a 50-lumen solid beam that lasts 1:30 hours. The Helix Sense 150 also offers an optional braking function and automatic brightness sensing.

Reviewer Michael Drummond said, “If you are set on making a lasting solid impression on road users, other lights may be better for you. However, if you’re confident enough in the flashing options and long life this small light offers, then I recommend it highly for long rides and wet days on the bike.”

Garmin Varia Rearvue 820
Garmin Varia Rearvue 820 (Image Credit: Farrelly Atkinson)

Garmin Varia Rearvue 820

Best rear light with radar

Gives accurate and timely information

Works optimally with a modern Garmin head unit or app

Well made

Very customisable

Relatively expensive

Certain audible alerts absent when using other brands of head unit (via ANT+)

The Garmin Varia RearVue 820 is a fantastic radar and rear light that is highly customisable to your preferences and setup. It proves that Garmin’s radar lights are still the benchmark.

Okay, the Varia RearVue 820 is quite expensive, and it’s best paired with a compatible Garmin head unit to make the most of its rich feature set, but it shows more useful detail than before, while retaining the right amount of audible alerts to let you know what’s going on behind.

It improves situational awareness significantly and is now more customisable than ever. Add in an excellent light and a fast recharge time, and it’s pretty much unbeatable.

Coospo TR70 Smart Radar Tail Light
Coospo TR70 Smart Radar Tail Light (Image Credit: Farrelly Atkinson)

Coospo TR70 Smart Radar Tail Light

Best radar rear light for value

Accurate radar

Excellent battery life

Superb in-app customisation

USB-C

Garmin quarter turn standard attachment

Minimal info about remaining charge on the unit itself

The Coospo TR70 Smart Radar Tail Light is an excellent device at an excellent price – and that’s a strong combination. Reviewer Paul Grele struggled to find any weaknesses.

As a radar detecting traffic behind you, the TR70 is reliable, accurate and dependable. As a light, it provides various solid and flashing modes – including a Day Flash mode – and the battery life is long – 14 hours for the High Solid light through to 30 hours for the Day and Night Flash settings, with the Radar-only mode capable of 40hrs.

This is a really impressive offering that functions well in all areas.

More great rear bike lights

Knog Plus Rear Light
Knog Plus Rear Light (Image Credit: Farrelly Atkinson)

Knog Plus Rear Light

Cable-free charging

Highly visible

Easy to detach

Light and slim

A bit wobbly on aero posts

It might be called the Knog Plus, but this rear light is anything but plus-size as it weighs just 18g.

Described as “an impressively simple light that weighs almost nothing” by our reviewer, the 20 lumens it pumps out is bright enough for a useful visibility boost. The mount is magnetic and, like most Knog lights, there’s a USB port built into it so you don’t need a cable to charge.

Burn time isn’t the greatest in steady mode at two hours, but on eco flash you can get a huge 40 hours out of it according to Knog. There are five modes to choose from, and at well under the 20 quid mark you can’t really go wrong.

Lezyne Strip Drive 300+ LED Rear Light
Lezyne Strip Drive 300+ LED Rear Light (Image Credit: Farrelly Atkinson)

Lezyne Strip Drive 300+ LED Rear Light

Easy to use

IPX7 waterproofing

Huge run-times

Wide range of powerful modes

It’s quite chunky

No-nonsense, easy-to-use and highly capable – that’s how our reviewer summarised Lezyne’s revamped Strip Drive with a huge 300 lumens in its max setting, and loads of other useful modes for all use cases at a sensible price.

You get a huge 80 hours out of this light in the lowest 5-lumen mode, and in the 60-lumen ‘always on’ mode, it’s still over five hours – enough for a week of commuting or more for most of us. It’s easy to use and fits almost any seatpost with the flexible back and stretchy rubber strap to attach it.

If you want to go even brighter still, there’s always the Lezyne Zecto Drive Max 400+ that also scored well in its road.cc review – but the Strip Drive edges it for the huge run times and ease of use. You don’t get any smart braking tech or extras beyond the super bright light, but the very good price reflects that.

Giant Recon TL 200 rear light
Giant Recon TL 200 rear light (Image Credit: Farrelly Atkinson)

Giant Recon TL 200 rear light

Easy to use

Waterproof, reliable and durable

Good run-times

Compact

Bright

Tricky to separate light from bracket (but at least you won’t lose it on bumpy ground)

The Recon 200 is neither cheap nor too pricey, and kicks out a huge 200 lumens on the max setting. You get 270 degrees of visibility thanks to two strips in the side of the light unit, ensuring you’re visible to motorists approaching from side streets.

Charging is via USB and you can mount the light vertically or horizontally. There are seven modes to choose from, and you can get an impressive six hours on the high flash mode. It weighs just 51g in total.

This is a great little light with lots of power. If your budget is tighter or you don’t feel like you need this many lumens, we’d also highly recommend the Giant Recon TL 100.

Exposure Boost-R with ReAKT and Peloton
Exposure Boost-R with ReAKT and Peloton (Image Credit: Farrelly Atkinson)

Exposure Boost-R with ReAKT and Peloton

Great build quality

Good runtimes

Several modes

Bright

Pricey

This smart rear light from Exposure gives you a big 80 lumens on the max setting, plus six modes with run-times ranging from six to 48 hours.

The ‘ReAKT’ feature is excellent, adapting to the light conditions and flaring up when it senses that the rider is braking. Additionally, the Peloton feature recognises when there is a front bike light behind you and dims itself to save dazzling the following rider.

If you have the cash to invest in this light, you won’t be disappointed.

Pairs/light bundles

Lezyne Strip Drive+ Pair
Lezyne Strip Drive+ Pair (Image Credit: Farrelly Atkinson)

Lezyne Strip Drive+ Pair

Good battery life

Really well made

Simple functionality

USB-C charging

Wide angle of visibility

A little bulky

Front light better suited to being mounted vertically, which limits fitting options

Simple rubber strap mount isn’t as robust feeling as some

The Lezyne Strip Drive+ Pair is a durable, well-made light set that does an excellent job of increasing your visibility out on the road.

Each light has a solid feel with a USB-C charge port hidden by a tough rubber cap and an IPX7 waterproof rating to add confidence.

The Strip Drive+ front puts out a maximum of 700 lumens, while the Strip Drive 300+ adds 300 lumens at the rear.

They offer wide 270° visibility; the only issue is that the front light can be a little distracting when mounted horizontally on the handlebar.

How to choose from the best bike lights

Do I need bike lights?

If you’re going to be riding in any conditions other than bright sunshine, then yes, it’s essential to own a set of bike lights; in fact, in the UK and many other countries, it’s illegal to ride on public roads between sunset and sunrise without lights (and pedal reflectors in the UK, although this is rarely enforced or understood by most police officers).

Some cyclists use lights at all times to add extra visibility and alert the less competent drivers around them of their presence. In the UK and pretty much everywhere else in the world, it isn’t a legal requirement to use lights before dusk or after sunrise, so this is really up to you.

How bright should my bike lights be?

As a very rough rule, you front light needs to be at least three times the brightness of your rear light, and a lot more than that if you plan to ride on unlit trails. We’ve already mentioned that lumens isn’t the only thing that tells you the total brightness of your light, but generally you’ll want something that is advertised as having at least 100 lumens on the front to be visible to other road users, preferably 200 or more. General feedback we’ve had from the road.cc team tells us that most lights with round beams advertised as kicking out 800 lumens or more can be dazzling on their highest setting; but again, use your judgement and choose a front light that is easy to toggle between high and lower settings if you’re switching between lit and unlit sections on your ride.

Lights for riding off-road at night need to be much brighter, and thanks to modern technology you can get front lights that will illuminate a trail almost like it’s daytime. Trail lights will often have beams advertised at well over 1,000 lumens, sometimes as high as 5,000.

Rear lights don’t need to illuminate your path and red/orange beams require less power than white ones, so the number of lumens you need will be much less. A 20 lumen rear light is usually more than adequate for riding on the road and can be seen from quite some distance.

What is the difference between lumens and lux?

In short, lumens is the total amount of light emitted from the source in all directions, while lux measures the total amount of light that falls on a surface, taking area into account. To give a brief example, if you shine a beam that has a total of 1,000 lumens at the wall, at its max brightness but on a setting where the beam spreads 80 degrees wide, there will be far less lux on the wall than if you had the same brightness but with a beam that spreads 40 degrees wide. It’s because of this that we use lux in our Beam Comparison Engine, measuring the lux value of the beam at two metres distance, in 10cm increments from the centre of the beam to 1m from the centre, which gives a total of eleven readings.

To clarify: most brands will advertise how bright their lights are using lumens and this is a decent indicator of how bright they can be, but it doesn’t tell the full story.

What is an StVZO-compliant bike light? Do I need one?

In Germany, front lights have to be StVZO-compliant, which means they have a beam that is cut off to avoid dazzling other road users; these are often square as opposed to round. The legislation also requires that front lights must be on constant and not flashing, which means Germans are forbidden from using flashing or pulsing settings. The reasoning for this is because flashing or pulsing lights are distracting, according to the StVZO rules.

Do you need to abide by these rules? If you live in Germany, then yes, of course. For the rest of us, we can use our own judgement to decide which beam shape and style is best for us. It is perhaps polite and common sense to use front and rear lights that don’t dazzle other cyclists, motorists and pedestrians, and if you want to make sure of this then you can look for beams that are StVZO-compliant. The problem is that not many manufacturers outside of Germany make them, with Lezyne and Cateye being two rare examples of brands that sell StVZO-compliant lights in the UK. Some brands such as Ravemen and Moon use refractive lenses to shape the beam so less of it’s going into the sky, and we’ve found Ravemen’s version with refractive elements to spread and lower the beam to be especially effective.

In short, do what’s best for you and your riding, but be considerate of others. You might feel the need to up your beam strength momentarily to alert someone of your presence if you think they have not spotted you, so in this case a quick, strong flash of light might achieve this without causing any harm.

Are LED bike lights best?

The very short answer to this question is yes, bike lights that use LEDs in some form or another will be your best option in most situations!

As we mentioned in our intro, LED lights have improved massively in the last two to three decades and are pretty inexpensive to make and to buy. They’re tiny, they last forever, they’re rugged, they run fairly cool, and they’re easy on the juice, so it’s a no-brainer. Any lights that don’t run off LEDs are not really worth bothering with nowadays when you can pick up rechargeable LED bike lights for under 15 quid.

Emily is our track and road racing specialist, having represented Great Britain at the World and European Track Championships. With a National Title up her sleeve, Emily has just completed her Master’s in Sports Psychology at Loughborough University where she raced for Elite Development Team, Loughborough Lightning. Emily is our go-to for all things training and when not riding or racing bikes, you can find her online shopping or booking flights…the rest of the office is now considering painting their nails to see if that’s the secret to going fast…  

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