• SureFire X400

    $499.00 $399.00

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    X400® Handgun/Long Gun Weaponlight w/Red LASER
    Part Number: X400 (Black)
    NSN: 6230-01-579-1382

            The SureFire X400 combines a brilliant white light with a bright red laser aiming device in one WeaponLight. A high-efficiency LED generates 170 lumens of brilliant white light focused by a Total Internal Reflection (TIR) lens to produce 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 below the primary light, is nearly twice as bright and much more visible than the nearest competitor.

    Part #:
    High Output:
     170.0 Lumens
    Tactical Runtime*:  2.4 Hours
    Bulb Type:  Single-Output LED
    LASER Color:  Red
    LASER Power:  5mW
    LASER Wavelength:  635nm
    LASER Runtime:  24 Hours
    Length:  3.60" (9.1cm)
    Bezel Diameter:  1.13"
    Weight w/Batteries:  4.4 oz (125 grams)
    Batteries:  (2) 123A (Included) 6-Volt Operation
    Body Color:  Black
    LED Color(s):  White
    Fits:  Handguns and Long Guns w/Picatinny or Universal Rails

         The laser's adjustment mechanism uses Nylok® screws that won't back out from the effects of recoil, which means it rarely needs to be re-zeroed. The white light/laser combination makes the X400 effective in close- to medium-range engagements, ideal for law enforcement, military, and self-defense use. The high-strength aerospace aluminum body is Mil-Spec hard anodized for superior toughness and corrosion resistance, and is O-ring and gasket sealed to make it weatherproof. The X400 comes with two adapter wedges permitting rapid attachment to and removal from either Universal or Picatinny rails. An ambidextrous push/toggle switch provides one-finger operation for either momentary or constant-on operation, and a mode switch allows you to select white light only, white light + laser, laser only, or system disable. Optional pistol grip switches permit operation with the top grip finger, leaving the index finger free to operate the handgun trigger. Other switches are available for operating the X400 when attached to a long gun. Click here to view them.


        Quick-Detach Rail Clamp

        High-Visibility 5mW / 635nm Red LASER Sight

        Virtually indestructible LED emitter regulated to maximize output and runtime Note 1  

        Tactical-Level output w/Total Internal Reflection (TIR) lens for close-to-longer-range applications and sufficient surround light for peripheral vision. Note 2

        MILSPEC Hard-Anodized High-Strength Aerospace Aluminum, Impact-Resistant Polymer, Optically Coated Tempered Window, and O-Ring seals make for a rugged WeaponLight

        Accepts optional Pistol Grip and Long Gun Forend Switches

        Weatherproof O-ring and gasket sealing

        Includes (2) High-energy 123A battery with 10-year shelf life

    Note 1 Light Emitting Diodes (LED's)

    With the exception of our HellFighter® WeaponLights, all current SureFire illumination tools use an LED (Light Emitting Diode) light source. An LED is a semiconductor chip that converts electrical energy directly into light. An LED is classified as a solid-state light source because it has no gas or liquid components, as do other light sources. The LED's in SureFire flashlights consists of an emitter chip mounted on a solid base; the chip is attached to electrical leads that conduct power to it, and it’s encased in a clear polymer that is shaped to focus or disperse the LED's light in the desired manner.

    LED's generally emit light within a narrow spectral band. In order to produce white light, which consists of nearly the entire visible spectrum combined, we use LED's that emit near-ultraviolet blue light that strikes an upper layer of phosphors. These phosphors absorb the blue light and re-emit white light, in much the same manner that fluorescent light tubes produce white light.

    LED's possess tremendous advantages over incandescent lamps. First, LED's can last thousands of hours versus less than fifty hours for high-output incandescent lamps. Second, because LED's are very robust in construction, and have no delicate parts such as glass bulbs or filaments, they are extremely resistant to vibration and shock, making them well suited for the combat environment or for mounting on firearms. Third, white-light LED's produce virtually no invisible infrared radiation, as opposed to incandescent lamps, which emit over 85% of their output as infrared, and therefore LED's are much more efficient in producing light than incandescent lamps — an important factor for battery-operated flashlights. And fourth, they will emit light over a wide range of power input, making LED's the natural choice for variable-output light sources.

    Most LED's emit from a flat surface, necessitating complex reflectors and lenses to produce desirable beam characteristics. Because LED's are susceptible to potential damage from overheating, they have certain thermal design requirements that dictate the maximum output possible from a given LED, and affect the overall configuration of the specific illumination tool. LED's are difficult to manufacture without some variance in lumen output and color. For this reason, they are tested and sorted by the manufacturer into different bins according to output and color. SureFire minimizes such product variability by purchasing LED's only from the highest-quality bins.

    Most SureFire's LED illumination tools contain a durable, sealed electronic power regulator that supervises the operation of the LED. This circuitry assesses battery output, monitors system performance, and controls power supplied to the LED. Power regulation provides a more consistent light output for the usable life of the batteries. Although an LED may continue to produce negligible light output for up to several hundred hours, the amount of useful light produced is of a shorter duration. Power regulation reduces the period of negligible output and increases the duration of useful light output.

    Previously the only downside to white-light LED's was that they produced only negligible amounts of infrared radiation; therefore they could not be fitted with an infrared filter and then used with night vision devices (NVD's). However, in 2009 SureFire introduced its V-Series WeaponLights, which use a multi-spectrum LED that encapsulates both white light and infrared radiation in a single compact package capable of changing spectrum with the twist of a bezel, with no need for an IR filter.


    Note 2 TIR Lenses —SureFire Total Internal Reflection (TIR) lenses are primarily refracting elements, but as their name implies they also utilize reflection. Our TIR lenses are precision-molded from a clear, tough Cyclo-Olefin Polymer that surrounds the LED emitter and gathers virtually all the light produced, then reflects and refracts it forward in a carefully designed beam pattern. Typically the pattern is a comparatively “tight” brighter central cone of light that provides good reach; this is surrounded by a cone containing the remainder of the emitted light, which provides illumination for your peripheral vision.