Nitecore Thumb flashlight review

2 x unspecified LEDs
85 lm output
170 cd intensity
integrated Li-Ion battery

The Nitecore Thumb flashlight released in 2017. It uses 2 x unspecified LEDs, no reflector and integrated Li-Ion battery. The powerful emitter in this flashlight provides up to 85 lm output, 170 cd intensity, and a beam distance of 26 m.

Want to know if the Nitecore's flashlight stands out? Keep going!

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 Thumb, then tell us.

Nitecore Thumb / THUMB

The Thumb flashlight provides instant illumination at the touch of a switch. This immediate response is particularly useful in emergency situations. This light has 3 modes of lighting. Without mode memory, this flashlight always starts in the default mode. The Thumb may also support other charging methods. These include solar panels or hand-cranked mechanisms.

Nitecore Thumb specifications

Rated 4 / 5 based on 1404 user votes.

This Nitecore flashlight is compact and handheld. It is easy to carry and maneuver.

Nitecore Thumb / 4

Body, materials, weight, colors

Weight25 g
Length74 mm
Head diameter24 mm

The 25 g flashlight may not provide the same level of brightness or features as larger models. The length of a flashlight can affect how it feels in your hand and how you can grip and maneuver it. This flashlight features a captivating black color.

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System, LED, lens, reflector

Emitter2 x unspecified LEDs
Color temperature6500 K
Switchelectronic side

The color temperature choice depends on the light's use and personal taste. Some flashlights with electronic switches have programmable features. They allow users to customize the behavior of the flashlight.

Nitecore Thumb / 2

Performance, flux, intensity, throw

Flux85 lm
Intensity170 cd
Throw26 m
CD/LM factor2

You mainly need a flashlight for basic tasks like finding keys or navigating in dimly lit areas. 85 lm can be enough. It can also be enough for occasional use around the house. 170 cd can make things quite bright. It's enough for many everyday tasks. 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.

Nitecore Thumb / 1

Software, user interface, modes

Modes3 modes
Mode memoryno
Ramping modeno

A flashlight's modes are different output settings or brightness levels. They can be chosen to meet different needs and preferences. The Thumb's SOS mode produces a specific sequence of long and short flashes. It signals distress or emergency.

Features, battery, protections

Batteryintegrated Li-Ion battery
Battery indicatoryes
Charger portmicroUSB
Thermal regulationno
Impact resistance1 m
Specialsadjustable head
red light

The Thumb flashlight utilizes integrated Li-Ion battery as its power source. The battery indicator helps users check the battery status. It also estimates how much runtime they have left before recharging the battery. The built-in charger allows for convenient and versatile charging. You can use various USB power sources to recharge the battery. The Thumb flashlight lacks built-in LVP. You should use a protected battery to prevent over-discharging.

Flashlights without thermal protection may be more susceptible to overheating under extreme conditions. The flashlight has an IPx8 rating. It can withstand being submerged in water beyond 1 meter for a prolonged period. The manufacturer specifies this. A flashlight's impact resistance can vary. It depends on its design, construction, and intended use. Extra LEDs have different colors or modes, they can help with specific tasks.

Accessories, package contents

Package contentskeyring

According to the ANSI/NEMA FL1 Standard, we measure the performance of the Thumb 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
  • side switch
  • multiple modes
  • SOS/beacon function
  • integrated battery
  • battery indicator
  • USB charger
  • waterproof
  • auxiliary LEDs


  • plastic body
  • unspecified LED
  • cool light
  • moderated performance
  • low intensity
  • no mode memory
  • no LVP
  • no thermal regulation
  • non-magnetic


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Nitecore Thumb / THUMB

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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.
FlashlightChart.com / Flashlights / Nitecore / Nitecore Thumb (2017)