Princeton Tec Apex HeadlampFEATURES The brightest headlamp in Princeton Tec's professional series, the waterproof Apex incorporates a single Regulated Maxbright LED plus four Regulated Ultrabright LEDs. Powered by 275 Lumens, the Apex is capable of producing a powerful spot beam or a bright flood, making it a favorite of extreme outdoorsmen and cavers for years. Proprietary heatsink technology allows the LEDs to burn brighter and longer. 4 AA Alkaline (included), Lithium or