Princeton Tec Apex Series 550 Lumens Head Lamp The brightest headlamp in our professional series, the Apex, has been a favorite of extreme outdoorsmen and cavers for years. The pinnacle of waterproof LED headlamp design, the Apex incorporates a single regulated Maxbright LED plus four regulated Ultrabright LEDs. The Apex is capable of a powerful spot beam or a bright flood, and two switches make changing modes intuitive. Proprietary heatsink technology allows the LEDs to burn brighter and longer. Features: Waterproof housing Headstrap tool for opening battery compartment Dual control buttons Powerful spot beam or bright flood Proprietary heatsink technology burns brighter and longer