The new Quad Tactical augments the original Quad’s light weight and durable design with three interchangeable lens covers which filter the four Ultrabright, regulated LEDs into red, blue or green light. Princeton Tec - Quad Tactical Headlamp The new Quad Tactical augments the original Quad s light weight and durable design with three interchangeable lens covers which filter the four Ultrabright regulated LEDs into red blue or green light