The SureFire X400 incorporates a brilliant white light with a bright red laser aiming device in one WeaponLight. A high-efficiency LED generates 110 lumens of brilliant white light focused by a Total Internal Reflection (TIR) lens. This produces a tight beam with good reach and significant surround light for peripheral vision. The LED has no filament to burn out or break and generates tactical-level light-enough to overwhelm an aggressor's night-adapted vision-for 2.4 hours per set of batteries. The 5-milliwatt, 635 nanometer laser sight, located beneath the primary light, is nearly twice as bright and much more evident than the closest competitor. The laser's adjustment mechanism uses Nylok screws that will not back out from the effects of recoil, which means it hardly ever needs to be re-zeroed. The white light/laser combination makes the X400 efficient in close- to medium-range engagements, right for law enforcement, military, and self-defense utilization. The high-strength aerospace aluminum body is Mil-Spec hard anodized for enhanced toughness and corrosion resistance, and is O-ring and gasket sealed to make it weatherproof.