Nitecore i4000R flashlight review

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

The Nitecore i4000R flashlight was 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.

Curious if this Nitecore flashlight is great? Keep reading to find out!

Table of Contents

  • Nitecore i4000R specifications
    • Body, materials, weight, colors
    • System, LED, lens, reflector
    • Performance, flux, intensity, throw
    • Software, user interface, modes
    • Features, battery, protections
    • Accessories, package contents
    • Links
  • Conclusion, pros and cons
  • Photos
  • Comparisons

The content of this article reflects our own experiences and viewpoints. We aim to offer insights on a topic, and we hope others find it helpful and motivating. Additionally, we make every effort to provide accurate and comprehensive coverage.

Nitecore i4000R / I4000R

The flashlight is a must-have tool for outdoor activities, it offers guidance and safety. This light has 5 modes of lighting. The i4000R's mode memory makes the flashlight start in your preferred or needed mode. The strobe function produces a high-frequency flashing light pattern. The flashlight is rechargeable easily via USB port.

Nitecore i4000R specifications

Rated 3 / 5 based on 1497 user votes.

The i4000R flashlight enhances safety.

Nitecore i4000R / 1

Body, materials, weight, colors

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

The flashlight is comfortable to hold for a long time, and it is also easy to carry in pockets or bags. A smaller flashlight is easier to carry in a pocket, bag, or pouch. Aluminium is a lightweight material, which is beneficial for i4000R flashlight. The body of i4000R flashlight treated with a Type III hard-anodized, anti-abrasive finish. The i4000R flashlight is available in black.

Nitecore i4000R / 3

System, LED, lens, reflector

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

Lighting professionals trust Cree LEDs. Cree LEDs have gained a strong reputation for quality and performance. The color temperature choice depends on the light's use and personal taste. The smooth reflector creates a well-defined hotspot at the center. The AR coating is thin and applied to the lens surface. The i4000R flashlight has multiple switch options. Mechanical switches are usually robust. The rear switch of the i4000R is usually operated with the thumb or finger.

Nitecore i4000R / 4

Performance, flux, intensity, throw

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

The i4000R flashlight has 4400 lm. It will provide an exceptionally bright and powerful beam of light. The i4000R flashlight has 13300 cd, it can light objects at greater distances. The throw is the 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.

Nitecore i4000R / 2

Software, user interface, modes

Modes5 modes
Mode memoryyes
Ramping modeno

A flashlight's modes are different output settings or brightness levels. The flashlight has mode memory. It remembers the mode you were using when the light was last turned off. Designers created the strobe function to produce a disorienting or attention-grabbing effect.

Features, battery, protections

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 prevents surprise power failures. USB rechargeable flashlights are more popular now. This flashlight has built-in low voltage protection (LVP). It prevents damage from over-discharge. The built-in thermal control adjusts brightness output to prevent overheating. The "6" in the IP68 rating shows the level of protection. The "8" in the IP68 rating means the highest level of protection.

Accessories, package contents

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

The included battery lets you immediately use the flashlight for your desired applications. The package includes a holster to safely store your flashlight. The clip provides flexibility in how you carry your flashlight. The lanyard of the i4000R protects the flashlight from accidental damage. Instead of searching for matching O-rings, having spare O-rings allows quick fixes.

Official sitehttps://flashlight.nitecore.com/

Conclusion, pros and cons

This Nitecore flashlight, like any other, has its strengths and weaknesses. Let's take a close look at both sides to understand this flashlight better. I share my thoughts on its standout features and the parts that might need improvement. Keep in mind, these are just my opinions, and you might have a different perspective.


  • lightweight
  • aluminium body
  • warm light
  • AR coated lens
  • tactical switch
  • strong flux
  • multiple modes
  • mode memory
  • tactical strobe
  • battery indicator
  • USB charger
  • low-voltage protection
  • thermal regulation
  • dust protected
  • waterproof
  • battery included
  • protective holster
  • clip


  • no auxiliary LEDs
  • non-magnetic


Nitecore i4000R / I4000R photo 1.
Nitecore i4000R / I4000R photo 2.
Nitecore i4000R / I4000R photo 3.
Nitecore i4000R / I4000R photo 4.
Nitecore i4000R / I4000R photo 5.
Nitecore i4000R / I4000R


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Updated: April 23, 2024

David Hagon
I love bushcraft and flashlights. I find joy in mastering wilderness survival skills and exploring the realm of illuminating gadgets. Bushcraft isn't just fun, it's a learning journey. I form a strong bond with nature. It's more than a hobby, it enriches me in practical and spiritual ways.