Nitecore NU40 1000lm headlamp review: Pros and Cons

2 x unspecified White LED, 1 x unspecified Red LED
1000 lm output
2700 cd intensity
integrated 2600mAh Li-Ion battery

The Nitecore NU40 headlamp released in 2023. It uses 2 x unspecified White LED, 1 x unspecified Red LED, TIR reflector and integrated 2600mAh Li-Ion battery. The powerful emitter in this headlamp provides up to 1000 lm output, 2700 cd intensity, and a beam distance of 104 m.

Table of Contents

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. If you found an error or something lacking in the specifications for the Nitecore NU40, then tell us.

Nitecore NU40 / NU40

Wear this headlamp on your head or helmet, you can direct the light where you look. This leaves your hands free for tasks or activities. TIR lens plays a significant role in shaping the beam pattern of the NU40 flashlight. This light has 5 + 2 modes of lighting. With mode memory, when you turn off the NU40 and then turn it back on, it will activate the last used mode. This USB rechargeable flashlight has become popular. It's a top choice for both everyday and demanding use.

Nitecore NU40 specifications

Rated 3 / 5 based on 425 user votes.

Headlamps are versatile lighting tools. They are hands-free and provide light. They work in many activities and places.

Nitecore NU40 / 2

Body, materials, weight, colors

Weight116 g
Length79.8 mm
Body diameter46.1 mm
Head diameter43.9 mm
Dimensions79.8 x 46.1 x 43.9 mm

The flashlight weighs 116 g. It is generally comfortable to hold for a long time, and it is also easy to carry in pockets or bags. The best flashlight size depends on personal preference. It also depends on intended use and the specific features you want. This flashlight comes in a sleek black color option.

Nitecore NU40 / 3

System, LED, lens, reflector

Emitter2 x unspecified White LED, 1 x unspecified Red LED
Color temperature6500 K
Switchdual electronic side

The color temperature choice depends on the light's use and personal taste. The NU40's TIR lens is made of a single piece of transparent material. This material is typically acrylic or polycarbonate. Some flashlights with electronic switches have programmable features. They allow users to customize the behavior of the flashlight.

Nitecore NU40 / 1

Performance, flux, intensity, throw

Flux1000 lm
Intensity2700 cd
Throw104 m
CD/LM factor2.7

The 1000 lm output of NU40 provides great flexibility. You can adjust the brightness to fit different needs. The NU40 flashlight has 2700 cd. It provides a much brighter and more intense beam. The throw distance is the farthest distance the flashlight can light an object. The candela per lumen (cd/lm) ratio can be used to determine if a flashlight has a spot or flood type beam.

Software, user interface, modes

Modes5 + 2 modes
Mode memoryyes
Ramping modeno

A flashlight's modes are different output settings or brightness levels. They can be chosen to meet different needs and preferences. The flashlight has mode memory. It remembers the mode you were using when the light was last turned off. It stays in that mode when you turn it on again. The SOS code starts three short signals. Then, three long signals follow. Finally, there are three short signals again.

Features, battery, protections

Batteryintegrated 2600mAh Li-Ion battery
Battery indicatoryes
Charger portUSB Type-C
Thermal regulationyes
Impact resistance2 m
Specialsproximity sensor
red light
white light

The NU40 flashlight utilizes integrated 2600mAh Li-Ion battery as its power source. The battery indicator prevents surprise power failures. It ensures the flashlight is ready when needed. USB rechargeable flashlights are more popular now. They are popular because they are convenient and sustainable. LVP (Low Voltage Protection) is designed to protect the battery. It stops over-discharging, which can reduce battery life or cause permanent damage.

The NU40 has thermal protection feature. These mechanisms track and regulate the flashlight's temperature as it operates. The "6" in the IP68 rating shows the level of protection. It's against solid objects, like dust and foreign particles. The flashlight has an IP68 rating. It can withstand being submerged in water beyond 1 meter for a prolonged period. The manufacturer specifies this. The NU40 flashlight proudly boasts an exceptional impact resistance rating of 2 m.

Accessories, package contents

Package contentsUSB Type-C cable

According to the ANSI/NEMA FL1 Standard, we measure the performance of the NU40 flashlight 30 seconds after switching on the light. The ANSI/NEMA FL1 2009 Standard is a set of flashlight performance guidelines.

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
  • TIR lens
  • side switch
  • adequate performance
  • multiple modes
  • mode memory
  • SOS/beacon function
  • integrated battery
  • battery indicator
  • USB charger
  • low-voltage protection
  • thermal regulation
  • dust protected
  • waterproof


  • plastic body
  • unspecified LED
  • cool light
  • low intensity
  • no auxiliary LEDs
  • non-magnetic


Nitecore NU40 / NU40 photo 1.
Nitecore NU40 / NU40 photo 2.
Nitecore NU40 / NU40 photo 3.
Nitecore NU40 / NU40 photo 4.
Nitecore NU40 / NU40

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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.
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