EOS Tactical Princeton Tec Headlamp. The Eos Tactical headlamp is military tough and designed with an ultra light rugged and compact housing. Using three AAA batteries the Eos Tactical also has an easy-to-change lens filter system for specific nighttime activity enhancements. Red lenses for preserving night vision, blue for blood tracking and green for hunter safety and map reading. It has four output modes the strongest of which can shine the 1 watt Maxbright LED up to 56 meters. The Eos Tactical has a regulated LED that maintains initial brightness for up to 50 hours on low setting.