The desert tan Surefire 1000-Lumen LED Upgrade Head is a fast and effective way to upgrade the output of your older model Scout M600 Ultra weaponlight—simply unscrew the old head and replace it with this 1000-lumen LED upgrade. Utilizing the Total Internal Reflection (TIR) lens, the beam is pre-focused at the factory with a tight, smooth center cone of light and a wide peripheral ring to help you maintain your situational awareness. Built for daily use, the head is made of aluminum with a corrosion-resistant desert tan anodized finish, and is O-ring and gasket-sealed to be water-resistant. When installed on the two CR123 battery-driven light the upgraded head brings with it a tactical runtime of 1.25 hours.