Bike Lights

The main benefits of using bike lights are enhanced safety and visibility. You see better, and others (car drivers, cyclists, pedestrians) can see you better, too! A white front light illuminates the path ahead, allowing you to see hazards like potholes or debris, while also making you visible head-on to traffic and pedestrians. Meanwhile, a red rear light or reflector makes you conspicuous to drivers approaching from behind. Using the best bike lights—which is often required by law after dark or in low visibility conditions like rain and fog—will dramatically improve your safety!

The best bicycle lights will excel in several key areas. Sufficient brightness (measured in lux or lumens) is crucial—enough to illuminate your path and make you highly visible. Look for wide visibility angles to ensure you're seen from multiple directions. A practical battery life that matches your typical ride duration (ideally with USB recharging) is also essential. The mounting system should be secure, easy to use, and stable on your bike. Good weather resistance (indicated by an IP rating like IPX4 or higher) ensures reliability in rain, and multiple modes, such as high beam, low beam, or flashing, offer versatility for different conditions.

Choosing the right bike light involves thinking about your needs. First, consider where you ride. For well-lit urban areas, focus on lights that make you highly visible to others. For unlit roads or trails, prioritize a powerful front light with a beam pattern to illuminate your path effectively. As noted above, match the light's battery life to your typical ride duration, and consider the convenience of USB recharging. Also, ensure the mounting system is compatible with your bike, and choose lights with adequate weather resistance (IP rating).

In the United States, bicycle laws vary by state (and sometimes even by city), so there isn't one single set of requirements. When cycling between sunset and sunrise (or during periods of poor visibility), most states require you to have a white front light visible from a specified distance, typically 500 feet. A red rear reflector visible from a certain distance (often 300 feet) is also usually required. Most laws also require at least one bike light to be visible from 200 feet on either side. These are the main stipulations, but it's crucial to check the specific vehicle code or cycling laws for your state and local area before riding. Some states ban flashing bike lights, for example.

When it comes to bike lights, you’ll often see two measurements, lux and/or lumens. Lumens are units that measure the amount of visible light emitted by the source in all directions. Lux refers to the intensity of light falling on a specific surface area. For a bike light, lux will tell you how brightly the road or trail is lit up at a certain distance ahead.

The key difference is that lumens describe a light's total power, while lux describes the brightness or concentration of that light on a specific surface. So lux takes into account both the lumen output and the beam pattern of the light. (One lux = one lumen per square meter.) Lumens are more commonly advertised, but a lux number gives you a better idea of how effectively a headlight illuminates the path in front of you, which is why our Beam Bike Light Kits are advertised in lux.

As noted above, lux is often a more comprehensive measurement than lumens for a bike headlight (our Beam Light Kit has a 40 lux high beam and 20 lux low beam, more than enough for any normal riding scenario). But if shopping for a bike light that only lists lumens, here are some basic guidelines. In urban areas with decent street lighting, 100-400 lumens is sufficient. If riding on dimly lit roads, aim for 400-800 lumens. For riding on dark, completely unlit roads or trails, you’ll want 800 lumens or more. Choose bike lights based on the darkest conditions you typically encounter.

Your bike light’s fitment will vary depending on the make and model. Our bike lights have a near-universal design, meaning they will fit all retrospec bicycles and ebikes, and will work on any bike with a handlebar diameter of 22.2 to 31.8mm (0.87 to 1.25in).

Some high-performance bike lights with advanced features and very high brightness can be expensive, but bike lights don't have to cost a lot. You can find great, reliable bike lights, often sold as front and rear sets, for just $10 to $30. These lights are perfect for commuting in urban areas, or as essential safety equipment for any rider riding in low light. While premium options exist, basic and effective visibility on a bicycle doesn't have to cost an arm and a leg!

You should have bike lights on both the front and back of your bicycle. This is a legal requirement in most U.S. cities and states when riding at night or in low visibility conditions.

A front bike light should be mounted in the middle of your handlebars, facing forwards, while a rear light should be mounted on your seat post, facing backwards.

Yes! Most retrospec ebikes come with bike lights already installed. (The size and style will vary based on the model.) Some of our traditional pedal bicycles, like Beaumont Plus City Bike, come with bike lights pre-installed as well!

For bicycle lights, LED (light emitting diode) technology is vastly superior to older halogen bulbs, which is why LEDs are the modern standard. LEDs offer several crucial advantages for cycling. They are more energy-efficient, meaning you get much longer battery life or brighter light from the same battery. LEDs are also incredibly durable. Their solid-state components handle shocks and vibrations from roads and trails far better than fragile halogen filaments. Additionally, LEDs boast a dramatically longer lifespan, saving you hassle and replacement costs. These factors, combined with their ability to produce bright, clear light in compact designs, make LED technology the ideal choice for reliable, high-performance bike lights.

While laws vary based on city and state, the general color requirement for bike lights is a white front light and a red rear light (or reflector), the same color scheme used for cars and motorcycles.

Yes, bike lights can be too bright, especially front headlights. High brightness is needed in certain situations (like unlit trails), but excessive brightness also poses a safety hazard, because it can dazzle or blind oncoming drivers, cyclists, and pedestrians. This is a big problem on shared paths or roads with traffic. It's important to aim your light slightly downward, so that it illuminates your path without shining directly into others' eyes. Also consider using lower brightness settings when possible. Remember, high brightness drains your battery faster, anyways!

In most cases, your bike light should be steady. This is the safest and most respectful option. Flashing lights do attract attention and can increase your visibility during bright, daylight hours or in busy urban environments. But some research suggests flashing lights can be distracting and make it harder for others to judge your distance and speed, particularly at night. There are also cases of flashing bike lights triggering seizures in people with photosensitive epilepsy. Steady lights, on the other hand, provide consistent illumination, to properly see the path ahead, and make it easier for drivers to track your position and speed.

While the term dipped headlights (or “low beams”) is more accurate for motorcycles and cars, the principle also applies to bicycle headlights designed for road use, especially those with a shaped beam or cutoff. Cyclists use this beam pattern to prevent dazzling or blinding oncoming traffic, including car drivers, cyclists, and pedestrians. Directing the light downwards onto the road surface, instead of straight ahead into people's eyes, enhances safety for everyone. (Our Beam Bike Light Kit includes a low beam mode for this reason.)

A good guideline is to aim your bike light so the brightest spot of the beam hits the ground a significant distance ahead of you—far enough to see obstacles and react safely (~20 to 50 feet, depending on your speed and conditions)—but angled downwards, so it isn't shining into the eyes of others. If your light has a sharp horizontal beam cutoff, aim it so the cutoff line is projected onto the road ahead, below the horizon. You may need to fine-tune the angle slightly based on your specific light, bicycle, and riding conditions.

Laws vary, but most U.S. states require that a front bicycle light be visible from ~500 feet ahead. Likewise, a good standard for the rear is visibility from 300 feet behind. You should also aim for ~200 feet of visibility from the sides.

Not all bike lights are rechargeable, but our Beam Bike Lights are. These front & rear lights are powered by a lithium ion battery, rechargeable via an included USB-C charging cable.

The rechargeable lithium ion batteries on our Beam 2-Piece Bike & EBike Light Kit last for approximately four hours on a single charge. If you just need a little extra visibility for low-light conditions, you could consider battery-powered LED lights like Gleam instead. The two CR2023 button batteries in this light set can last for a year or more without needing to be replaced.

Yes, your bike lights should at least be water-resistant. If you ride enough, you’re going to eventually encounter unexpected rain, puddles, road spray, or high humidity, and this moisture can damage the electronic components inside your bike light, causing it to malfunction or fail when you need it most! While completely “waterproof” lights might be overkill (unless you plan on riding your bike underwater) a strong level of water resistance, indicated by ratings like IPX4 or IPX5, is crucial to ensure your lights work in drizzle, rain, or fog.

A product’s Ingress Protection (IP) rating is a standardized system used to classify how well an electrical enclosure protects against intrusion from solids and liquids (like water). When you see a rating like “IPX5” the “IP” means Ingress Protection, the “X” means it hasn't been rated for solid particle (dust) protection, and the number (in this case, 5) indicates the level of protection against water. You’ll often see IP ratings on flashlights, headlamps, and bike lights. Common IPX levels are:

IPX0: No protection from water.

IPX1: Protected against vertically falling water drops.

IPX2: Protected against vertically falling water drops when tilted up to 15º

IPX3: Protected against spraying water.

IPX4: Protected against splashing water from any direction.

IPX5: Protected against direct spray from low-pressure water jets.

Essentially, the higher the number after IPX, the better the protection against water. (Our Beam Bike Lights are rated to IPX5!) Ingress Protection does go up to higher ratings (6, 7, 8), but IPX5 is more than sufficient to ensure performance while riding in the rain.

Good bike light etiquette is about safety and consideration for others. Always use lights (white front, red rear) from sunset to sunrise, and during poor visibility. To avoid dazzling oncoming traffic, cyclists, or pedestrians with your front headlight, aim it slightly downwards, towards the road or path, not straight ahead. If you have a very bright light without a shaped beam, consider dimming it or using a lower setting on busy shared-use paths or when facing others directly. Remember to choose appropriate modes. Steady front beams are best for nighttime and most low-visibility conditions. Flashing modes excel at grabbing attention during the day, but avoid overly fast or erratic strobes.