Bright and lightweight! This small headlamp won't bog you down when you're tying on lures, or wearing it around the campsite. The Princeton Tec Quad Headlamp only weighs 96 grams and utilizes 4 ultra-bright LEDs that are protected inside a tough, waterproof housing. Light runs on 3 AAA alkaline or lithium batteries and is capable of 21 lumens with a runtime of about 150 hours on flash mode and 50 hours on high. Utilizes four modes – low, medium, high, and flash.