Princeton Tec Impact XL Dive Light - Undoubtedly, the new Impact XL is the finest 4 AA cell L.E.D. light to ever grace the market. Weighing in at approximately 5 ounces and offering waterproof integrity to 100 meters, the Impact XL utilizes a 1-watt L.E.D., which is one of the most powerful L.E.D. sources in the world. The light output of the Impact XL is significantly greater than competing 1-watt xenon and halogen bulbs. The rubber over molded grip ensures youll be able to securely hold the light under even the most demanding circumstances. With a bulb life rating of 10,000 hours, up to 50 hours of useful light and its rugged impact-resistant design, the Impact XL is sure to be reliable when you need it.