Nitecore i4000R 21700 Intelligent Tactical LED Flashlight
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Nitecore i4000R 21700 Intelligent Tactical LED Flashlight

by: Nitecore


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Powered by the revolutionary and powerfully upgraded 21700 i Series battery, the i4000R has an ultra high performance and an extended runtime. The exquisite craftsmanship with the advanced circuit makes it an ideal choice in various tactical and outdoor scenarios.


Utilizing 4 x CREE XP-L2 V6 LEDs with a lifespan of 50,000 hours, the i4000R has a max output of 4,400 lumens, a max throw of 230 meters and a max peak beam intensity of 13,300cd as a tactical blazing performance, ideal for law enforcement, assault operations, self defense, search and patrols. The independently controlled quadruple LEDs are powered by a constant current circuit to provide a durable usage with guaranteed safety.


The included 21700 i Series battery provides an upgraded performance of the flashlight with a 380-hour extended runtime to guarantee an extensive usage in your mission while compatible with 2 x CR123 / RCR123 batteries. Distinguished by its convenient reversible design with a USB-C charging cable, the charging port is double protected by the internally waterproof design and the rotatable cover while the aluminum alloy protective cover can provide excellent water, dust and impact resistance for the concealed charging port. The integrated ATR technology regulates the output of the i4000R according to the working condition and ambient environment to maintain the optimal performance.

 The ultimate dual tail switch design is able to access 5 brightness levels and STROBE Mode for different environments. The randomly changing frequencies combined with the 2nd Generation STROBE READY™ Technology can cause stronger dizzying effects due to the inadaptability of the naked eyes. The momentary access to TURBO of 4,400 lumens enables an abrupt disturbance to your adversary during the day or at night.

 The standard tube diameter of 1” (25.4mm) makes the i4000R compatible with NITECORE gun mounts including GM02 40-40, GM02 40-75, GM03 and GM04. Specially designed for law enforcement, the compact and MOLLE System compatible NTH20 Tactical Holster is included to enable a quick release of the flashlight with an adjustable stopper on the clip to suit belts of various sizes. The NITECORE NTR10 is also available as a tactical accessory to enable a unique and flexible way of carrying or operating a flashlight. It is all-weather applicable as IP68 rated, 2m submersible and 1m impact resistant.

4,400 Lumens 1,100 Lumens 330 Lumens 50 Lumens 2 Lumens 4,400 Lumens
*30 min 2h min 7 h 45 min 40 h 380 h -------
230 m 115 m 61 m 25 m 4 m --------
13,300cd 3,300cd 930cd 160cd 4cd --------
1 m ( Impact Resistance )
IP68, 2m ( Waterproof and Submersible )


Note : The stated data is measured in accordance with the international flashlight testing standards ANSI / Plato FL 1-2019 , using 1 x 21700 Li-ion battery ( 5000 mah ) under laboratory conditions. The data may vary in real world use due to different battery usage or environmental conditions.

*The run time for TURBO mode is tested without the temperature regulation.

Turbo Availability : The TURBO level is only accessible when using a 21700 rechargeable Li-ion battery with an output over 15A. It is inaccessible when using CR123 / RCR123 batteries.


    • Utilities 4 x Cree XP-L2 V6 LEDs with a maximum output of 4,400 lumens
    • An optical system combined with crystal coating and Precision Digital Optics Technology (PDOT)
    • Maximum beam intensity of 13,300cd and maximum throw of 230 meters.
    • Highly efficiently constant current circuit provides a stable output for up up to 380 hours.
    • Dual tail switches enables intuitive operations for tactical applications.
    • 5 brightness levels and 1 special mode available.
    • Strobe Ready® Technology to enable a quick access to strobe Mode ( Patent no. ZL201320545349.4 )
    • STROBE Mode uses randomly changing frequencies for stronger dizzying effects.
    • Intelligent Li-ion battery charging circuit with USB-C port.
    • Nitecore 21700 Li-ion battery included  (NL21500 HPi 5,000mAh )
    • Dual indicators are available to indicate the battery power. 
    • The power indicator can display the battery voltage(+- 0.1 V )
    • Intelligent Li-ion battery charging circuitry with a USB - C port.
    • Rigid double layer tube design.
    • Incorporated Advanced Temperature Regulation (ATR) module ( Patent No. ZL201510534543.6
    • Optical lenses with double sided scratch resistant coating
    • Constructed from aero grade aluminum alloy.
    • HA III military grade hard anodized finish
    • Rating in accordance with IPX68 ( 2 meters submersible )
    • Impact resistant to 1 meters.
    • Length :  159 mm /  (6.25”)
    • Head Diameter : 32.6 mm (1.28”)
    • Weight : 135 grams ( 4.76 oz )( without battery )
    • Nitecore  21700 Rechargeable Li-ion Battery ( NL12150 HPi 5,000 mAh)
    • CR123 battery magazine
    • clip
    • USB - C charging cable
    • lanyard
    • Spare O ring
    • NTH20 Tactical Flashlight Holster.
  • All NITECORE® products are warranted for quality. DOA / defective products can be exchanged for replacement though a local distributor/dealer within the 14 days of purchase. After 14 days, all defective / malfunctioning NITECORE® products will be repaired free of charge for a period of 18 months from the date of purchase. After 18 months, a limited warranty applies, covering the cost of labor and maintenance, but not the cost of accessories or replacement parts. The warranty is nullified in all of the following situations:

    1. The product(s) is/are broken down, reconstructed and/or modified by unauthorized parties.

    2. The product(s) is/are damaged through improper use.

    3. The product(s) is/are damaged by leakage of batteries.

    For the latest information on NITECORE® products and services, please contact your national NITECORE® distributor or send an email to

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