Nitecore Thumb 85lm In-depth review, Pros and Cons

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

The Nitecore Thumb (THUMB) 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.

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

Nitecore Thumb (THUMB) pictures

Nitecore Thumb / Thumb photo
Nitecore Thumb / Thumb photo
Nitecore Thumb / Thumb photo
Nitecore Thumb / Thumb photo
Nitecore Thumb / Thumb photo
Nitecore Thumb / THUMB

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 Thumb, then don’t hesite and signal the problem to us.

Nitecore Thumb (THUMB) specifications

Rated 4/5 based on 1266 user votes.

This Nitecore flashlight is designed to be compact and handheld, making it easy to carry and maneuver.


Weight25 g
Length74 mm
Head diameter24 mm

The 25 g flashlight may not provide the same level of brightness or features as larger models, it can be handy for quick and convenient illumination in emergency situations or for close-range tasks. The length of a flashlight can affect how it feels in your hand and how you can grip and maneuver it. A longer flashlight may provide a more substantial grip, making it easier to hold and control, especially if you have larger hands. This flashlight features a captivating black color.


Emitter2 x unspecified LEDs
Color temperature6500 K
Switchelectronic side

The choice of color temperature depends on the specific lighting application and personal preferences. The Thumb has electronic switch. Some flashlights with electronic switches have programmable features that allow users to customize the behavior of the flashlight. This may include setting specific modes, configuring brightness levels, or enabling unique functions according to individual preferences.


Flux85 lm
Intensity170 cd
Throw26 m
CD/LM factor2

If you mainly need a flashlight for basic tasks like finding keys, navigating in dimly lit areas, or occasional use around the house, 85 lm can be adequate. 170 cd can provide a reasonable level of luminous intensity for many everyday lighting tasks. The throw distance refers to the maximum distance at which the flashlight can effectively illuminate an object or target. The stated throw distance typically indicates the point at which the brightness falls below a specified threshold, such as 0.25 lux. Flashlights with a higher cd/lm ratio typically excel in long-range throw and focused beam applications, while flashlights with a lower cd/lm ratio may provide a wider and more evenly distributed beam for closer-range illumination or general-purpose use.


Modes3 modes
Mode memoryno
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. SOS mode of the Thumb produces a specific sequence of long and short flashes to signal distress or emergency situations. It is commonly used in outdoor adventures or survival scenarios.


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 Thumb has a battery indicator. A battery indicator is a feature that provides information about the remaining power level of the flashlight's battery. It helps users monitor the battery status and estimate how much runtime they have left before the battery needs to be recharged or replaced. USB rechargeable flashlights have become increasingly popular in recent years due to their convenience and sustainability.

The Thumb flashlight doesn't have built-in LVP, it is recommended to use a protected battery to prevent over-discharging. The protective circuit of battery helps safeguard the battery from various potential risks and ensures safe and reliable operation. This flashlight doesn't have built-in temperature control. Flashlights without thermal protection may rely on other design elements for heat dissipation, such as heat sinks, fins, or body materials with good thermal conductivity.

The Thumb flashlight with IPx8 rating can withstand being submerged in water beyond 1 meter for a prolonged period, typically specified by the manufacturer. It is recommended to handle flashlights with care and avoid subjecting them to unnecessary rough treatment to ensure their longevity and reliable operation. Auxiliary LEDs with different color options or specialized modes can be beneficial for specific tasks.


Package contentskeyring

The performance of the Nitecore Thumb 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.

Nitecore Thumb (THUMB) comparisons

According to our statistics, the Nitecore Thumb flashlight was most often compared on our site with the following flashlights.

Nitecore NU40 (NU40) Nitecore NU40 Nitecore Tube V2.0 (TUBEV2) Nitecore Tube V2.0 Nitecore TUP (TUP) Nitecore TUP Nitecore TIP (TIP) Nitecore TIP Nitecore UT32 (UT32) Nitecore UT32 Nitecore SRT6i (STR6I) Nitecore SRT6i Nitecore TIP SE (TIPSE) Nitecore TIP SE Nitecore HC30 (HC30) Nitecore HC30

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