Most headlamps these days are made with LED (light emitting diode) bulbs as they are a practical option and offer a high light output with low battery levels required. While some only use a single LED, there are some that use multiple to offer a wider beam, but some argue that a single focused beam is better. Sometimes, you may find halogen and tungsten bulbs being used, but these can break if the torch is dropped, so they are not ideal. Most LEDs last for a minimum of 5,000 hours, though 10,000 hours tends to be fairly standard. However, they do tend to get dimmer as the battery life depletes.