High Performance Headlamp. The headlamp that takes durability and power to the next level on your adventures, the Princeton Tec Apex is rated IPX7 water resistant and provides both a powerful spot beam and a bright flood light. Operated with two large buttons that make switching between modes quick and intuitive, the light offers 650 lumens and runs for upwards of 12 hours. The 4 AA battery pack comes clipped to the head strap and can be moved to your belt, pack, or jacket with an extended power cable for optimized comfort and incredible cold weather headlamp performance.