Going out in the dark is par for the course for many who exercise year-round. A long winter hike can often end after dark or start before sunrise. Many people come home late from work and can only run in the evening. Since many roads and paths are rarely sufficiently lit, an adequate headlamp is a must. The latest headlamps have energy-efficient LEDs and are powered either by disposable or rechargeable batteries. These lamps usually attach to an elastic, adjustable strap that can be adjusted so it doesn't slip while doing sport. Many lamps have different strength and width beams for different situations.