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If you want to be able to wear the headlamp outdoors in winter, it’s a good idea to make sure you can turn it on and off with gloves on. Some headlamps have an infrared sensor, so you can turn it on without having to press a button. If you want to wear it while climbing or playing sports, it should also be impact-resistant, so that it doesn't break if you hit something.
The batteries not only affect how long the lamp can run, but also how heavy it is. If you only need it from time to time, for example to find something in the attic or in the event of a power failure, ordinary AA or AAA batteries are sufficient. If, on the other hand, you want to bring it along on longer hikes, you should have headlamp batteries that can be charged. Some are charged via USB, others have solar charging. Solar cells are a good choice if you want to keep the headlamp in a crisis box, as then you are not dependent on electricity.
The higher the lumen, the brighter the headlamp's light will be. Here are some guidelines:
Unfortunately, higher amounts of lumen consume more battery, so keep that in mind when choosing a model. On some models you can adjust the light,so you can make the light beam brighter, for example, to see something further away. Some also have a strobe function that makes the light flash and can scare away wild animals.