An intensely bright 1800 Lumen 8 degree LED assembly in a Sartek 3-D cell Aluminum Housing, brighter than a 18 watt HID, depth rated to 1000', up to a 100,000+ hour lamp life. Burn time on D cells is 3-4 hours at full output and over 24 hours at reduced output and useable light for over 200+ hours. This is the toughest light you'll ever own. The Polycarbonate head can be reconfigured to a canister system which will give you the choice of using Alkaline, Lithium Ion or NiMH batteries, as your lighting needs change. The body is machined from a solid rod of aluminum. Lifetime warranty against material and workmanship defects.