You do not want to get left in the dark by a headlamp that dies at the worst possible moment. Not a problem with the Range 400. A quick charge gets you 6 hours of burn time at 400 lumens (which, if you dont know your lumens, is quite bright). It's also comfortable, fully-submersible, and super lightweight. With 4 light modes, a 1 hour power reserve, and ultrafast recharging, its a versatile headlamp you can rely on in just about any situation..View Range 400 Headlamp by BioLite on our site for more info. - The Bespoke Post store has the greatest gear from the world's best small brands. Free exchanges, easy returns and no commitments.