This dimmable head lamp of Petzl (serie NAO) is rechargeable(Lithium-ion) is a good choice, equipped with a powerfull lamp and cheap on batteries. When dimmed the burning time is 12 hours (120Lm and 60m) Petzl manufactures very qualitative, innovative headlamps. Wearing a headlamp on your head is very practical and common today. 30 years ago (Petlz invention) is was not. Since then, Petzls have become increasingly light, compact, durable and powerful.