Choose the right battery


Choosing a headlamp is about choosing the right one. Adequate lumen, adequate burn time and adequate weight. What is adequate depends on the activity you will be using your headlamp for. Lumen, i.e. brightness, and burning time are connected and influenced by each other. Therefore, there are also different batteries to choose from. High brightness and long burning time require a lot of battery, while lower brightness requires a powerful battery for a very long burning time or a smaller battery for a shorter burning time.

how much light do you NEED ?

The first question you should ask yourself when faced with buying a new headlamp is how much light you need. Don't buy an unnecessarily strong headlamp, that means a bigger battery.

If you are going to train short sessions in technical terrain, a strong lamp, on the other hand, can be a good idea, then you can use a smaller and lighter battery together with the lamp. Or do like the pros and use different amounts of light during the same session.


"What sets professional headlamp users apart is that they keep track of their batteries, and they don't want to carry more battery than they need. To maximize the battery's burn time, they turn down the light as much as they can when they're running, for example flat and untechnical or going up the mountain on skis. A top user has their light on maximum power all the time, even when it's not needed."

/ Mattias Jacobsson, product manager at Silva

BURNING TIME and brightness

There are crucial factors that affect how much light you get out of a headlamp, and also for how long. That's why there are graphs on our packaging that show the burning time of our headlamps

Simply explained about burning time

Silva uses the American lighting standard ANSI to calculate burn time. The burning time measures the time it takes from when the light is switched on until the light reaches 10% of the starting value. A headlamp that has 1000 lumens and a three hour burn time will give you 100 lumens after those three hours, according to ANSI.

The burning time is not static. It is affected by various factors:

• If the lamp is operated at the minimum or maximum possible capacity
• How big the battery is
• The temperature of the environment you are staying in
• Wind - and speed wind, because the lamp needs to be cooled

CAN I INFLUENCE the burning time?

If you use a lower capacity of the headlamp, the burning time will be extended. Likewise, the burning time is longer with a larger battery. If it's very cold outside, the burning time is shortened drastically, that's why we often advise to keep your battery in your pocket or bag when it's freezing outside.

powerful headlamps

Powerful headlamps need cooling to function optimally. A powerful headlamp is developed to optimize cooling through smart design, but powerful headlamps are also intended for high-speed sports. Speed ​​requires a lot of light, and the speed wind is important in itself to contribute to the cooling of the lamp. The fact is that our most powerful lamps need cooling to give maximum lumens, but when a lamp is maxed out, more of the battery is used. If you stand still with your powerful headlamp, the lack of cooling will automatically give less light, it is the lamp's own protection against overheating. Less light requires less of the battery – which gives a longer burning time. There are thus many factors that affect the burning time of your headlamp.

On the graphs we use that show the burning time of the headlamp, the time is given in -5 degrees and +20 degrees.

The right battery for the right ACTIVITY

Many of our headlamps can be used with different sized batteries, this gives more flexibility to the use of the same lamp. If you both run and cycle in your everyday life, you can advantageously use the same headlamp, but switch batteries depending on the sport. The product manager at Silva is Mattias Jacobsson professionals at using headlamps in different contexts and situations. Here he gives his favorite configurations, perfect balances between weight, light and burning time for various activities.


When you run, you want a light and pretty lamp. Running involves a lot of head movement and since the battery is often on the back of the head, you want as little as possible to disturb and weigh you down. Runs are often relatively short, which means you don't need a particularly large battery. If you want to run longer sessions, you can choose a slightly larger battery but keep it close to your body instead.

Mattias advises:

"Trail Speed ​​5R. This is a lightweight headlamp with very good light and burn time just right for a run. Bring several batteries if you're going to run ambitious long runs or try ultra running."

cross-country skiing

As a cross-country skier, you can also wear slightly larger batteries on your head. When you ski, you move in a different way so the battery will not interfere.

Mattias tips: (Or Silva tips?)

"Do like the Swedish and Norwegian national ski teams and use ..." Battery?


When you ride a bike, you don't have a battery on your head. Cycling is also not as bumpy, so you can store the battery on your body and preferably choose a larger battery because you will probably be out for more hours.

Mattias advises:

"On the bike, I like to have a strong light on the handlebars, and possibly a weaker light on the head. Others want a strong light on the head to have the light where you look. If I have 10.5 Wh or 7.5 Wh on the frame, it doesn't matter role"

"Exceed 4X with a bicycle mount mounted on the handlebars. It provides a lot of light and burn time that is enough for a long bike ride. Buy a smaller battery for short runs in technical terrain with a lot of light."

Low-intensity activities

Let the headlamp become your everyday companion that accompanies you on evening outings, dog walks, as an emergency lamp in the car or perhaps your most important tool to have near the tent site.

Mattias advises:

"For camping, mech in dark spaces, fetching firewood, etc. I recommend the Explore RC. It is small, durable and with a very good light image. It is also rechargeable."

"I would also like to recommend our ISPO Award-winning headlamp Terra Scout, which is made of hemp fiber and recycled plastic. It is user-friendly and incredibly light."


Action sports

Adrenaline-filled activities such as downhill cycling, ski alpinism, night orienteering and enduro require a strong light that likes speed as much as you do.

Mattias advises:

"Spectra by Silva is our most powerful lamp to date with its 10,000 lumens. Spectra is the given choice for extreme sports." Battery?

There is always more to discover

Our headlamp philosophy

We have been around since the 1930s and with all the experience we have learned a lot about headlamps. This is how we think when we design our headlamps.

Our different models

When you're out in the dark, we want your headlamp to feel like a natural part of yourself. Here is an overview of our different headlamps.

Advantages of Silva's light

The optics in all our headlamps have Silva Intelligent Light, which optimizes the light image, all multilamps also have the flexibility of Silva Flow Light.