Fenix TK25R Reference Manual and SpecificationsUpdated 2 hours ago

The Fenix TK25R is a multi-angle tactical flashlight with UV, red, and red/blue flash options. This summary is drawn from the manufacturer's official user manual — see the downloadable PDF reference manual on the product page for complete details.

Warning

Do not place this flashlight within reach of children.
Do not shine this flashlight directly into the eyes of anyone.
Do not place the light head near flammable objects; high temperatures can cause objects to overheat and become flammable/ignite.
Do not use this flashlight in inappropriate ways such as holding the unit in your mouth — doing so could cause serious personal injury or death if the light or internal battery fails.
This flashlight will accumulate a significant amount of heat while operating, resulting in a high temperature of the light shell. Pay close attention to avoid burns.
Turn off and lock the flashlight or remove the battery to prevent accidental activation when the flashlight is placed in a closed and flammable environment such as pockets and backpacks.
The LEDs of this flashlight are not replaceable; the whole light will need to be replaced when any one of the LEDs reaches the end of its lifespan.

Product Features

3600 lumens maximum output, 350 meters maximum beam distance
Main light uses one Cree XHP50.3 LED, with a lifespan of 50,000 hours
Powered by an included Fenix ARB-L21-5000 V2.0 battery and compatible with a Fenix ARB-L21-6000 battery
Equipped with a multi-LED system that includes a high-power tactical light, a wide side light, a UV light, a red light, a red flashing light, and a red-and-blue flashing light
Toggle switch enables convenient switching between Duty mode, Lockout/off mode, and Tactical support mode for various scenarios
Professional spot- and flood-light for both broad up-close illumination and long-distance lighting
Dual tail switch for momentary-on, instant Turbo, and instant Strobe
USB Type-C port supports fast charging and allows the flashlight to be fully charged in just 1.5 hours
Made of durable A6061-T6 aluminum with full-metal CNC-machined light body
Premium type HAIII hard-anodized anti-abrasive finish
Size: 6.46'' x 1.42'' x 1.03'' / 164 x 36 x 26.2 mm. Weight: 7.90 oz / 225 g (including battery)

Operating Instructions

On/Off: tap the tactical switch to turn on the light momentarily, release it and the light will go out. Fully press the tactical switch to constantly turn on the light; fully press the tactical switch again to turn off the light.

Mode Switching: in any state, turn the tail toggle switch to select the needed mode — turn it to the left end to enter Duty mode, to the right end to enter Tactical support mode, and to the middle to enter Lockout/off mode.

Output Selection (Duty mode): single click the functional switch to cycle through Low, Med, High, and Turbo.

Output Selection (Tactical support mode): single click the functional switch to cycle through White light (Low), White light (High), UV light, Red light, Red flash, and Red & Blue flash.

Lockout/Off Mode: with the light turned on, turn the tail toggle switch to Lockout/off mode to turn off and lock the light. The dual tail switch will not respond to any operation.

Instant Turbo: with the light turned on, fully press the tactical switch and hold it for 0.5 seconds to enter Turbo; single click the functional switch to enter Low or White light (Low). Fully press the tactical switch to turn off the light.

Instant Strobe: with the light turned on, press and hold the functional switch for 0.5 seconds to enter Strobe; single click the functional switch or tap the tactical switch to recall the previously used output. With the light turned off, press the functional switch to enter Strobe instantly, release it and the light will go out.

Intelligent Memory Circuit: the flashlight automatically memorizes the previously selected output, excluding Strobe. When turned on again, the previously used output of the currently selected mode will be recalled.

Technical Parameters (ANSI/PLATO FL1)

Duty Mode:

Turbo: Output 3600 lumens, Runtime 2 h 20 min*, Distance 350 meters, Intensity 28,000 cd.
High: Output 1000 lumens, Runtime 3 h, Distance 170 meters, Intensity 7,500 cd.
Med: Output 350 lumens, Runtime 7 h, Distance 100 meters, Intensity 2,600 cd.
Low: Output 30 lumens, Runtime 55 h, Distance 30 meters, Intensity 270 cd.
Strobe: Output 3600 lumens.

Tactical Support Mode:

White light (High): Output 150 lumens, Runtime 5 h.
White light (Low): Output 30 lumens, Runtime 30 h.
UV light: Output 700 mW, 365 nm.
Red light: Output 15 lumens, Runtime 20 h.
Red flash: Output 15 lumens.
Red & Blue flash: Output 15 lumens.

Impact Resistance: 1.5 meters | Water Resistant: IP68 (Submersible)

Note: according to the ANSI/PLATO FL1 standard, the above specifications are from the results produced by Fenix through its laboratory testing using one Fenix ARB-L21-5000 V2.0 battery under the temperature of 21±3°C and humidity of 50%-80%; the true performance of this product may vary according to different working environments and the actual battery used. *The Turbo output is measured in total of runtime including output at reduced levels due to temperature or the protection mechanism in the design.

Battery Specifications

Fenix ARB-L21-6000B (21700, 3.6V): Recommended.
Fenix ARB-L21-6000 (21700, 3.6V): Recommended.
Fenix ARB-L21-5000 V2.0 (21700, 3.6V): Recommended.
Fenix ARB-L21-5000U (21700, 3.6V): Recommended.
Fenix ARB-L21-4000P (21700, 3.6V): Recommended.

Do not mix batteries of different brands, sizes, capacities, or types. Do not use an 18650, CR123A, or 16340 battery. 21700 Li-ion batteries are powerful cells designed for commercial applications and must be treated with caution and handled with care. Using low-quality batteries or mishandling batteries (such as short-circuiting or overheating) could lead to combustion and jeopardize the safety of users and property. Any adverse effects resulting from the use of low-quality batteries are not covered by any Fenix warranty or liability. Using quality batteries with circuit protection will reduce the potential for combustion or explosion.

Battery Replacement: unscrew the light body and insert the battery with the anode side (+) towards the light head, then screw the light body back on.

Charging

Turn off the flashlight and open the anti-dust cap to reveal the charging port, then connect the USB Type-C end of the charging cable to the light.
The battery level indicator will display red while charging and will turn green when fully charged.
Once charging is completed, be sure to unplug the charging cable and close the anti-dust cover.

Note: when charging fails or the battery is reversely connected, the battery level indicator will flash red to remind users to check the battery. The charging time of the included Fenix ARB-L21-5000 V2.0 battery is about 1.5 hours from depleted to fully charged with a 5V/2A charging adapter. The flashlight cannot be operated while charging. This only works with a Fenix ARB-L21 series battery.

Battery Level Indication

Each time the flashlight is turned on, the indicator will indicate the battery level and will last for 3 seconds.
Green light on: saturated, 100% - 85%.
Green light flashes: sufficient, 85% - 50%.
Red light on: poor, 50% - 25%.
Red light flashes: critical, 25% - 1%.

*This only works with a Fenix ARB-L21 series battery.

Intelligent Overheat Protection

The flashlight will accumulate a lot of heat when used at high output levels for extended periods. When the flashlight reaches a temperature of 60°C/140°F or above, it will automatically step down a few lumens to reduce the temperature. When the temperature drops below 60°C/140°F, the flashlight will gradually recall the preset output level.

Low-Voltage Warning

When the voltage level drops below the preset level, the flashlight is programmed to downshift to a lower brightness level until Low output is reached. When this happens in Low output, the battery level indicator blinks red to remind users to recharge or replace the battery in a timely manner. This only works with a Fenix ARB-L21 series battery.

Usage and Maintenance

Disassembling the sealed head can cause damage to the flashlight and will void the warranty.
Recharge the battery in time to ensure normal use for next time.
Fenix recommends using an excellent-quality battery.
If the flashlight will not be used for an extended period, remove the battery, or the flashlight could be damaged by electrolyte leakage or explosion.
Lock the flashlight or take out the battery to prevent accidental activation during storage or transportation.
Long-term use can result in O-ring wear; to maintain a proper water seal, replace the ring with an approved spare.
Periodic cleaning of the flashlight and battery contacts improves the flashlight's performance, since dirty contacts may cause flickering, intermittent operation, or failure to illuminate — check for a poor battery level or dirty contacts, and contact the distributor if cleaning doesn't resolve it.

What's Included

Fenix TK25R flashlight, ARB-L21-5000 V2.0 battery, USB Type-C charging cable, Holster, Lanyard, Spare O-ring, User manual, Warranty card.

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