EOS. The Princeton Tec EOS Headlamp is designed with the user in mind, the EOS is optimal for both localized needs and spotting at a distance. The combination of a Luxeon/1 watt L.E.D. and the Princeton Tec designed optimized lens/collimator maximizes the beam by balancing long throw with flood light. The use of high grade materials ensures durability and strong resistance to water/weather/environment conditions.