Serious sports fans will inevitably have to get outside in the dark. Hikes can often start or end after dark in the winter. Many people come home late from work and can only go running in the evening. Since many roads and paths are poorly lit, headlamps are essential. The latest headlamps have energy-efficient LEDs and are powered either by disposable or rechargeable batteries. The lamps attach to an elastic and adjustable strap that can be optimally fitted to the head so it doesn't slip. The intensity and width of the beam can often also be adjusted.