Nitecore i4000R 4400lm In-depth review, Pros and Cons

4 x Cree XP-L2 V6 LEDs
4400 lm output
13300 cd intensity
1 x special 21700 Li-Ion battery

The Nitecore i4000R (I4000R) released in 2019. It uses 4 x Cree XP-L2 V6 LEDs, SMO reflector and 1 x special 21700 Li-Ion battery. The powerful emitter in this flashlight provides up to 4400 lm output, 13300 cd intensity, and a beam distance of 231 m.

The i4000R is a powerful and reliable flashlight. With its impressive illumination capabilities and durable construction, it serves as an exceptional lighting tool for various situations and environments. This light has 5 modes of lighting. Instead of having to cycle through multiple modes to find the desired setting, mode memory of i4000R ensures that the flashlight starts in the mode you prefer or need.

The strobe function produces a high-frequency flashing light pattern that is designed to disorient or distract potential threats or aggressors. The flashlight is rechargeable easily via USB port.

Nitecore i4000R (I4000R) pictures

Nitecore i4000R / I4000R photo 1.
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Nitecore i4000R / I4000R

The specifications below are based on the official data published by the manufacturer, but we also take user reviews into consideration. If you found an error or something lacking in the specifications above for the Nitecore i4000R, then don’t hesite and signal the problem to us.

Nitecore i4000R (I4000R) specifications

Rated 3 / 5 based on 1377 user votes.

The i4000R flashlight enhances safety by illuminating potential hazards and improving visibility in low-light conditions.


Weight135 g
Length159 mm
Head diameter32.6 mm
Materialaluminium alloy with HAIII hard-anodized finish

The 135 g flashlight is generally comfortable to hold for extended periods and easy to carry in pockets or bags. The ideal length of a flashlight depends on personal preference, intended use, and the specific features and functionality you're looking for. Aluminium body of i4000R is known for its durability and strength. It offers excellent resistance to impacts, scratches, and corrosion. The body of i4000R flashlight treated with a Type III hard-anodized, anti-abrasive finish. The i4000R flashlight is available in black.


Emitter4 x Cree XP-L2 V6 LEDs
Color temperature5000 K
LensAR coated glass
Switchmechanical rear, mode pedal rear

Cree LEDs are trusted by lighting professionals and have gained a strong reputation for quality and performance. The choice of color temperature depends on the specific lighting application and personal preferences. With the smooth reflector, the beam tends to have a well-defined hotspot at the center, which provides a concentrated beam of light for long-range applications. The Anti-Reflective coating is a thin optical coating applied to the surface of the lens to minimize reflections and improve light transmission.

The multiple switch configuration on the i4000R flashlight can be a useful option, providing additional versatility and convenience in operating the flashlight. Mechanical switches are typically built with robust construction, making them resistant to wear and tear, and capable of enduring various environmental conditions. The rear switch of i4000R is typically operated with the thumb or finger, making it easily accessible and convenient to use.


Flux4400 lm
Intensity13300 cd
Throw231 m
CD/LM factor3.02

With 4400 lm, the i4000R flashlight will provide an exceptionally bright and powerful beam of light. The i4000R flashlight with 13300 cd has an extended throw distance, allowing you to illuminate objects or areas at greater distances. The throw is the calculated distance in meters at which the flashlight produces a light intensity of 0.25 lux. The candela per lumen (cd/lm) ratio can be used to determine if a flashlight has a spot or flood type beam.


Modes5 modes
Mode memoryyes
Ramping modeno

Modes on a flashlight refer to different output settings or levels of brightness that can be selected to suit different needs and preferences. Mode memory means that the flashlight will remember the mode you were using when the light was last turned off, and when you turn it on again. The strobe function is designed to create a disorienting or attention-grabbing effect.


Battery1 x special 21700 Li-Ion battery
Battery indicatoryes
Charger portUSB Type-C
Thermal regulationyes

The i4000R flashlight utilizes 1 x special 21700 Li-Ion battery as its power source. The battery indicator helps prevent unexpected power failures during critical situations and ensures that the flashlight is ready for use when needed. USB rechargeable flashlights have become increasingly popular in recent years due to their convenience and sustainability. This flashlight has a built-in low voltage protection (LVP) to prevent damage to the cell from over-discharge, so protected cells are not necessary.

The i4000R has thermal protection feature. The thermal protection mechanisms are designed to monitor and regulate the temperature of the flashlight during operation. The "6" in the IP68 rating represents the level of protection against solid objects, specifically dust and foreign particles. The "8" in the IP68 rating indicates the highest level of protection against water ingress.


Package contentsCR123 battery magazine
NTH20 tactical holster
USB Type-C cable
spare o-ring
special 21700 battery

With an included battery you can immediately use the flashlight for your desired applications, saving time and allowing you to focus on your tasks or activities. The package includes a holster to safely store your flashlight. The clip provides flexibility in how you carry your flashlight. The lanyard of i4000R helps protect the flashlight from accidental damage by preventing it from falling or hitting the ground. Instead of searching for compatible O-rings, having spare O-rings readily available allows for convenient and immediate repairs or replacements.

The performance of the Nitecore i4000R flashlight is measured according to the ANSI / NEMA FL1 Standard 30 seconds after switching the light on. The ANSI/NEMA FL1 2009 Standard is a set of flashlight performance guidelines.

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