Technical Specifications


Head Dia.
1.9 inch (47 mm)
Body Dia.
1.6 inch (40 mm)
4.7 inches (121 mm)1
7.7 ounces (220 grams)1

Battery Type

  • 4xAA
  • Compatible battery (diameter/length)
    • AA: (14-14.5mm/50-51mm)
  • Use pre-charged (low self-discharge) NiMH rechargeable AA, or High capacity rechargeable NiMH, or 1.5V lithium AA batteries.
  • Do not use alkaline or low grade batteries as they are not designed for high drain device. These battery may not function at MAX output.
  • Do not work with li-ion batteries

Operating voltage

  • 2.7V - 7V

What's included

  • SX30A4 flashlight
  • Spare o-rings
  • User Manual
  • Mil-Spec Para-cord Lanyard w/ quick attachment clip
  • Add-on diffuser filter with flip-cover feature
  • Heavy duty nylon holster

Carrying method

  • Para-cord lanyard with quick attachment clip
  • Heavy duty nylon holster


  • IPX-8 standard

Replaceable items

  • Lens


  • Smooth aluminum reflector


  • HAIII hard anodization aerospace aluminum


  • CREE XHP35 HD E4 Cool White LED
  • CREE XHP35 HI E2 Cool White LED
  • Nichia 219C 4000K CRI92 R9050 SW40 D240 Neutral White LED

Max output

  • CREE XHP35 HD E4 Cool White LED
    • LED lumen: 2000
    • ANSI FL-14 lumen: 1618
  • CREE XHP35 HI E2 Cool White LED
    • LED lumen: 1870
    • ANSI FL-14 lumen: 1427
  • Nichia 219C 4000K CRI92 R9050 SW40 D240 Neutral White LED
    • LED lumen: 885
    • ANSI FL-14 lumen: 740

Beam Profile

CREE XHP35 HD E4 Cool White LED

  • Center lux: 43,200 lux
  • Center spot angle: x°
  • Spill light angle: x°
  • Beam distance: 453 yards / 416 meters
CREE XHP35 HI E2 Cool White LED

  • Center lux: 76,500 lux
  • Center spot angle: x°
  • Spill light angle: x°
  • Beam distance: 603 yards / 553 meters
Nichia 219C 4000K CRI92 R9050 SW40 D240 Neutral White LED

  • Center lux: 37,600 lux
  • Center spot angle: x°
  • Spill light angle: x°
  • Beam distance: 423 yards / 388 meters


  • Waterwhite glass lens w/ harden treatment
  • Anti-reflective (AR) coating on both side (96% transparency)
  • Multi-layers low color distortation A.R. coating on both side (98% transparency) to prevent reflections and color shadow over wider wavelength - Nichia 219 CRI92 only

LED circuit

  • W1900 Pro - XHP35
    • Offer current regulated MAX output with a single li-ion battery down to 3.0V (underload)
    • MAX output slowly reduces after 3.0V and operates until 2.65V (underload)
    • Built-in shut down voltage at 2.65V (underload) to prevent battery over-discharge leakage(user may restart at lower levels)
    • Active thermal management feature (adjustment range 75%-100%)5
    • Synchronous boost controller with ultra low resistance mosfet which offers up to 95% efficiency
    • High switching frequency convertor for more compact circuitry design
    • Non-dimming constant current regulation for all output levels without flicking
    • Very low standby current (negligible)
  • C3800 SC - Nichia 219C
    • Ultra low dropout voltage for longer current regulated runtime
    • Active thermal management feature5
    • Low internal resistance design offers up to 99% efficiency
    • High switching frequency (1MHz) controller for more compact circuitry design
    • Non-dimming constant current regulation for all output levels without flicking
    • Smart battery level report system
    • Energy saving feature5
    • Very low standby current (negligible)

Battery level report (discharging)

  • A blue LED indicator under the main switch reports the estimated battery remaining capacity
    • Flash once: lower than 20%
    • Flash 3 times: 20%-50%
    • Flash 3 times: 50%-80%
    • Flash 4 times: higher than 80%

Battery Arrangement

  • Innovative slot load design
  • No battery tray or battery magazine needed
  • Battery arragement design patent pending in United Status, Hong Kong, and China

Output and Runtime

  • Five brightness levels
    • Led lumen:
      • XHP35 HD E4:
      • XHP35 HI E2:
      • Nichia 219C CRI92:
    • ANSI FL-1 lumen:
      • XHP35 HD E4:
      • XHP35 HI E2:
      • Nichia 219C CRI92:
    • Runtime:
    • 0.9-1.2/2.4/6.5/20/180 hrs
      (4 x Sanayo Eneloop AA Pro 2450mAh)

      0.7-1/1.8/5/15/140 hrs
      (4 x Sanayo Eneloop AA 1900mAh)

      1-1.3/3/8.3/25/220 hrs
      (4 x Energizer Ulimate Lithium AA)

      -/1.2/4.2/18/190 hrs
      (4 x Varta High Energy Type 4906 AA)

      -/1.2/4.7/21/205 hrs
      (4 x Duracell Ultra power AA alkaline)
  • Optional disorienting strobe output


Basic operations:
  • Turn on the light at MAX output by pressing the BLACK button switch. Turn on the light at LOWEST output by pressing the WHITE button switch
  • To turn off the light anytime, press and release the BLACK button switch.
  • For MAX output momentary on, press and hold the BLACK button switch for immediate output.
  • To switch between different brightness levels, press and release the WHITE button switch when the flashligh is on.

    (For example: if you want to turn on the flashlight at the 3rd level, just press and release the white button switch three times from off.)
  • To enter hidden auxiliary levels, cycle through two set of regular output brightness level to enter
  • For instant MAX output - at any output level, press and hold the BLACK button switch. Release the button to return to previous level.
  • For instant Strobe output - at any output level (even) off), double press and hold the BLACK button switch. Release the button to return to previous level (or off).
  • Programmable startup level - Define the white button startup level by cycling to the desired output level and keep holding the white button for more than five seconds until the blue led indicator turns on.


Other features

  • LED direct soldering on copper for maximum heatsink ability
  • User replaceable glass lens
  • Battery reverse polarity protection
  • Ultra low internal resistance phosphor bronze springs (silver coated)
  • Spring loaded positive and negative terminal


Battery Safety Precaution

Ensure the protective circuit on the 18650 batteries has current limitation of higher than 5A. Always use proven EAGTAC batteries for best performance and reliability.

All EAGTAC flashlights are designed to use button-top battery (battery with protruding positive terminal). For rechargeable li-ion battery, use only EAGTAC li-ion battery, or other protected li-ion battery with compatible length and diameter. Before using the battery, check and ensure the battery outer wrapping (the isolating plastic film that wraps around the metal housing of the battery) is complete. Broken battery wrapping may lead to short circuit and damage to the flashlight.

Lithium and Li-ion battery can explode or cause burns if disassembled, shorted, or exposed to high temperature. Do not mix new and used batteries. Do not mix batteries with different brand, capacity, voltage, or install batteries backwards.

NiMH rechargeable battery may release gas during discharge. If you experience an inflated switch boot or find high pressure being built inside the flashlight, switch off the flashlight immediately. Slowly loosen the tail-cap to reduce the internal pressure and replace all batteries.     Back to top

Flashlight Maintenance

Periodically clean the threads and o-rings with a lint free cloth and apply a thin coating of EAGTAC synthetic grease to the o-rings and threads. After prolonged exposure to moisture, the head and batteries should be removed, inspected, and dried. Do not touch or attempt to clean the reflector, as it will scratch the reflective coating permanently.     Back to top

  1. This weight measurement is based on the Kit model excluding batteries
  2. All batteries must have protruding top button.
  3. Beam output diameter taken at one meter
  4. ANSI FL-1 Lumens is a measurement of light output standardized by American National Standards Institute for use with flashlights. This ANSI Lumen measurement is the total overall light output being emitted from the flashlight measured in a calibrated integrated sphere. This measurement is generally more accurate as it takes into consideration the loss from reflector/lens/bezel.
  5. After 60 seconds at maximum output level (100%), the active thermal management feature will be activated and continuously adjusts the maximum output level according to the flashlight internal tempearture. The C3800 adjustment output range is between 80% to 100% (72%-100% for W1900). This feature maintains the flashlight surface temperature to be about 130°F (54 °C) for C3800 or 140°F (60 °C) for W1900 (higher surrounding temperaturemay result in higher flashlight temperature). It's normal for high power flashlight to run hot at MAX level. Reduce the output if the user finds the flashlight too warm to hold.
  6. Runtime is measured using four Sanyo Eneloop Pro AA 2450mAh batteries. MAX level runtime includes out-of-current regulation time period when battery is almost depleted. With active thermal management feature, runtime in cooler environment will have shorter runtime (higher MAX output) and long runtime in hotter environment (lower MAX output).
  7. Maximum efficiency occurs when input voltage is very close to LED forward voltage.