This head-mounted light boasts 450 lumens of power. It?s mounted on an adjustable head-strap which fits most head sizes, and is powered by three AAA batteries. This head-mounted light boasts 450 lumens of power. It?s mounted on an adjustable head-strap which fits most head sizes, and is powered by three AAA batteries.450 lumens at 6500K color temperature Runs on three x AAA alkaline batteries Four power settings with a color-coded battery level indicator Anodized aluminum head and polycarbonate body for durabilityProduct Specifications Package Weight: 1 lbs Lumens: 450 Burn Time: 2 hrs (level IV), 4 hrs (level III), 8 hrs (level II), 20 hrs (level I) Light Source: Cree LED Power Source: 3 x AAA alkaline batteries Color Temperature: 6500K (Cool White) Maximum Depth: 100 Meters Tested Weight: 187g (including battery) Buoyancy: -56g (including batteries) Size: Dia. 36.8 x L. 84.4 mm with light head dia. 41mm Housing Material: Aluminum Alloy light head and Polycarbonate body