Electric Bicycle Lights â Expert Tips for Safe Cycling
Why are e-bike lights important?
E-bike lights are one of the most important safety features you should invest in. In Finland, cycling takes place in the dark or dusk for part of the year, and properly chosen lights significantly improve safety.
In this article, we will go through how to choose the best light for your bike â and what the law requires for e-bike front and rear lights.
What does the law require for e-bike lights?
According to the Finnish Road Traffic Act, bicycles, including e-bikes, must have working lights in the dark, dusk, or in poor visibility. The bike must have a white or light yellow light facing forward and a red light facing backward.
The front light must emit white or light yellow light forwards, and the rear light red light backward. The lights must be sufficiently powerful to ensure the cyclist is safely visible to other traffic.
Remember to angle the front light slightly downwards so that you don't dazzle oncoming traffic. In Finland, the light does not have to be permanently mounted on the bike; for example, a headlamp is also permitted as a front light. However, in practice, a light attached to the bike is usually the most convenient and safest solution.
If your bike has a trailer, it must also have a red reflector, and a rear light when used in the dark.
E-bike front light â illuminating or a daytime running light?
Bicycle lights can be divided into two basic types: illuminating lights and daytime running lights. This distinction is especially important for e-bike riders, as e-bikes are often ridden faster than regular bikes, which places higher demands on the lights.
The purpose of illuminating front lights is to light the path far ahead with a narrow and focused beam, so that the cyclist can see obstacles and terrain conditions in time. The purpose of daytime running lights, on the other hand, is to make the cyclist as visible as possible to other traffic.
In urban cycling, where street lighting provides a large part of visibility, a daytime running light can be a sufficient and safe choice. In contrast, off-road or on dark country roads, a bright and powerful front light is needed to allow for timely reaction to obstacles as speed increases.
The best light for a bike in urban cycling is one that is clearly visible to other traffic in all conditions, even during the day. Many manufacturers recommend using a light even during the day, as it can significantly improve the cyclist's visibility.
E-bike rear light â a cornerstone of safety
The e-bike rear light is at least as important as the front light. A good rear light is clearly visible from the sides and operates reliably in all weather conditions. According to the Road Traffic Act, a bicycle must have a red rear light at the back in the dark and at dusk.
Many rear lights have both a steady and a flashing mode. A flashing light can improve visibility in busy traffic, while a steady light makes it easier for other road users to estimate distance. However, opinions vary on this, with some believing a steady light is better and others finding a flashing light preferable.
The rear light should be attached to the seatpost or luggage rack so that it points directly backward and is not obscured by the bike's structures.
How many lumens does an e-bike need?
The brightness of lights is expressed in lumens (lm). The intended use determines the appropriate light output:
- Urban cycling and daytime running lights: 20â100 lm for a front light is sufficient when streetlights do part of the work. For a rear light, 20â50 lm is usually enough.
- Daytime use in traffic: To ensure the cyclist is clearly visible even during the day, the front light should have over 100 lm and the rear light about 50 lm of light output.
- Off-road and road cycling in the dark: At least 1,000 lm, preferably more. One light on the handlebars and another on the helmet is an effective way to illuminate the terrain, as light from different angles reduces shadows and a helmet light follows the direction of gaze.
E-bikes are often ridden faster than regular bikes, so the front light should have more power. For example, an e-bike front light of around 800â1,600 lumens is a good starting point for active urban, commuting, and touring use, especially when riding on dark or poorly lit roads.
However, lumen count alone does not tell the whole story about a light's functionality. The following factors also matter:
- Beam pattern: a narrow and long beam helps to see ahead, a wide one improves side visibility
- Optics: reflectors and lenses determine whether the light is even, dazzling, or well-defined
- Aim: even a powerful light aimed incorrectly can be dangerous or useless
- Cut-off line: a good front light does not dazzle oncoming traffic
Power source: battery, rechargeable battery, or dynamo?
For an e-bike rider, a USB-rechargeable battery light is most often the best choice. Battery lights are inexpensive and practical for light urban cycling, but for more powerful lights, a rechargeable battery is usually a more durable and practical solution.
Dynamo lights are almost maintenance-free and operate reliably year-round, but they usually don't reach the power levels of the most powerful lights designed for off-road riding.
In the Finnish winter, it is good to remember that cold temperatures impair battery performance. Store lights indoors between rides and ensure the light is sufficiently waterproof for autumn rains and winter conditions.
Summary: how to choose the right e-bike light
The best light for your bike is one that matches your riding style and environment. For urban cycling, a compact USB-rechargeable front and rear light pair is usually sufficient, while off-road and touring require a more powerful front light and a long-lasting battery.
If you ride an e-bike frequently in the dark, a good starting point is at least an 800â1,600 lumen front light and a high-quality red rear light. Additionally, pay attention to water resistance, battery life, beam pattern, and ease of attachment â these features determine practical user comfort.
Investing in high-quality e-bike lights is not just a legal obligation, but an important investment in your own safety on every ride.
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