1, battery power: lithium battery power is low, the brightness of the headlamp will be reduced. This is because the battery power is insufficient to provide sufficient power supply to the headlamp.
2, use mode: some headlamps have multiple brightness modes, in different modes, the brightness will be different. You need to check the operating instructions of the headlamp to understand how to switch between different brightness modes.
3. Temperature: The performance of lithium batteries can be affected by extreme temperature conditions. In cold environments, the voltage of the lithium battery will decrease, resulting in a diminished headlamp brightness. Similarly, in a high temperature environment, the performance of the battery will be reduced.
4, maintenance issues: headlamps used for a long time or often subject to bumps, poor contact or poor battery contact will lead to unstable brightness, you can check the battery and the battery box, to ensure that the battery is installed correctly and tightly connected to the contact points. A headlamp is a portable lighting device worn on a person's head to provide illumination and consists of a lamp and a strap secured to the head.