The Vortec offers the highest power to weight ratio of anything in it's class. Harsher, cold weather conditions are no problem for the Vortec; it's configured to provide significant extended burn times using lithium batteries without the need for bulb conversion. The Vortec includes one halogen bulb, one long-burn bulb, and wide and narrow beam reflectors. Illuminates up to 56 m away. Power: 4 W/28 Lumens (4AA). Water resistant. Burn time: 5 hrs (Halogen) or 8 hrs (long-burn). Weight: 8.1 oz.