This is the Princeton Tec Sector 5 Maxbright LED 1200 Lumen Scuba Diving Light Features: POWER: 1200 Lumens LAMP: 1 Maxbright LED BURN TIME: 6 Hours BATTERIES: 4 C Alkaline WEIGHT: 650 Grams The potent 1200 lumen Sector 5 is a serious primary dive light, delivering extensive illumination underwater. Four C-cell batteries keep the powerhouse light compact while providing 3.5 hours of runtime.The trigger switch is easy to use with gloved hands; access momentary on via a half-pull and constant on via full pull. The trigger also locks out to prevent accidental activation and battery drain while in transit or storage