Brightness and beam modes
Look for at least 200 lumens on the high setting with multiple modes including a low/economy mode for extended battery life, a flood beam for close-up tasks, and a spot beam for distance. A red-light mode is essential for preserving night vision.
Water resistance rating
Given the UK's famously wet climate, an IPX4 rating (splash-proof) is the bare minimum. Aim for IPX6 or higher if you plan to use it in heavy rain, stream crossings, or coastal conditions. Check that the battery compartment seal is robust.
Battery type and runtime
Choose between AAA-powered models (easy to find replacement batteries) or rechargeable lithium-ion units (lighter, longer runtime). For survival use, a model that accepts both is ideal. Look for a minimum of 8 hours runtime on medium setting.
Comfort and adjustability
A padded, adjustable headband that fits over a hat or helmet is essential. The lamp unit should tilt at least 60 degrees downward so you can direct light at your feet, your hands, or the path ahead without moving your head constantly.