This is the BigBlue 450N Underwater 8 degree beam Scuba Diving Head Light Features: Light Source:2x XML LED + 2x XPE Red LED Light Output:45 Lm (level I), 113 Lm (level II) 225 Lm (level III), 450 Lm (level IV) Casing Material:Aluminum alloy light head; polycarbonate body Power Source:3x AAA batteries Angle Of Light Beam:8-degree narrow beam Color Temperature:6500K Burn Time:2hrs (level IV), 4 hrs(level III) 8hrs(level II) and 20hrs (level I) Maximum Depth:100 m tested Size:Dia. 36.8 x L. 84.4mm with light head dia. 41mm Weight:187g (including batteries) Bouyancy:-56g (including batteries) Switching System:Push-button with battery indicator Front Glass:Tempered optical glass 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 (3) AAA batteries.