Fenix TK28R Reference Manual and SpecificationsUpdated 2 hours ago

The Fenix TK28R is a multi-LED high-performance flashlight. 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 batteries fail.
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 batteries 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 flashlight will need to be replaced when any one of the LEDs reaches the end of its lifespan.

Product Features

6500 lumens maximum output, 400 meters maximum beam distance
Main light utilizes a Luminus SFT70 LED and a Luminus SST70 LED for spotlight and floodlight. Red light source utilizes two OSRAM GR QSSPA1.23 red LEDs
Break-action battery loader allows for fast battery replacement
Dual tail switch for Instant Turbo, Instant Strobe, Instant Red flash, and other functions; tail toggle switch for seamless mode switching
Battery level indication
Powered by two included Fenix ARB-L18-3400 batteries
USB Type-C charging port features a sliding port cover to protect against dust and water ingress
Included stainless steel titanium-plated body clip for secure attachment on pockets or tactical gear
Intelligent overheat protection and low-voltage warning
Made of high-intensity aluminum alloy with hard-anodized finish. No battery holder design
Size: 5.82'' x 2.01'' x 1.26'' / 147.83 x 51 x 32 mm. Weight: 12.64 oz / 358.3 g (including batteries)

Operating Instructions

Mode Switching: in any state, turn the tail toggle switch to select the needed mode. Turn the toggle switch to the left end to enter White light mode, to the right end to enter Red light mode, and to the middle to enter Lockout/off mode. Turn the toggle switch to Lockout/off mode to instantly turn off the flashlight; the dual tail switch will not respond to any operation.

On/Off: with the light turned off and unlocked, 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, and fully press it again to turn off the light. With the light turned on, turn the toggle switch to Lockout mode to turn off the light.

Instant Turbo: with the light turned off and unlocked, fully press the tactical switch for 0.5 seconds to activate and maintain Turbo. Single click the functional switch to switch to the lowest output, or fully press the tactical switch to turn off the light.

Strobe/Red Flash: operations in White light mode correspond to Strobe; operations in Red light mode correspond to Red flash. With the light turned on, press and hold the functional switch for 0.5 seconds to enter Strobe/Red flash; single click the functional switch or tap the tactical switch to recall the previously used output. With the light turned off and unlocked, press the functional switch to enter Strobe/Red flash, release it and the light will go out.

Output Selection (White light mode): with the light turned on, single click the functional switch to cycle through Eco, Low, Med, High, and Turbo.

Output Selection (Red light mode): with the light turned on, single click the functional switch to cycle through Red light (Low), Red light (Med), and Red light (High).

Intelligent Memory Circuit: the flashlight automatically memorizes the last selected output, excluding Strobe and Red flash.

Technical Parameters (ANSI/PLATO FL1)

Turbo: Output 6500 lumens, Runtime 2 h 50 min, Distance 400 meters, Intensity 40,000 cd.
High: Output 2000 lumens, Runtime 3 h 20 min, Distance 225 meters, Intensity 12,800 cd.
Med: Output 800 lumens, Runtime 4 h, Distance 140 meters, Intensity 5,000 cd.
Low: Output 150 lumens, Runtime 23 h, Distance 62 meters, Intensity 1,000 cd.
Eco: Output 30 lumens, Runtime 83 h, Distance 27 meters, Intensity 190 cd.
Strobe: Output 3000 lumens.
Red light (High): Output 260 lumens, Runtime 6 h 30 min, Distance 68 meters, Intensity 1,170 cd.
Red light (Med): Output 100 lumens, Runtime 15 h, Distance 43 meters, Intensity 460 cd.
Red light (Low): Output 10 lumens, Runtime 90 h, Distance 14 meters, Intensity 50 cd.
Red flash: Output 10 lumens.

Impact Resistance: 1 meter | 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 two Fenix ARB-L18-3400 batteries 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-L18-3400 (18650, 3.6V): Recommended.
Fenix ARB-L18-3500 (18650, 3.6V): Usable.
Other Fenix ARB-L18 series batteries (18650, 3.6V): Banned.

Warning: do not use a 21700 or 16340 battery. Do not mix batteries of different brands, sizes, capacities, or types. 18650 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: open the battery loader and insert the batteries with one battery's anode terminal (+) towards the light head and the other's cathode (-) towards the light head, then close the battery loader. Once the battery compartment is closed, slide the battery latch to lock it in place and prevent it from accidentally opening.

Charging

Slide the port cover to reveal the charging port, then connect the USB Type-C end of the charging cable to the flashlight.
The battery level indicator will display red while charging and will turn green when fully charged.
When charging fails or the batteries are reversely connected, the battery level indicator will flash red or remain off to remind users to check the batteries.
This flashlight supports fast charging and can be fully charged in just 1.5 hours when charged with a 9V/3A charging adapter. When charged with a 5V/3A charging adapter, the charging time will be approximately 3 hours from depleted to fully charged.

Note: recharge a stored flashlight every four months to maintain optimum battery performance. This flashlight can be operated while charging.

Battery Level Indication

Each time the flashlight is turned on, the battery level 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%.

Note: this only works with a Fenix ARB-L18 series rechargeable 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 battery level is too low, the battery level indicator blinks red to remind users to recharge or replace the batteries in a timely manner. This only works with a Fenix ARB-L18 series rechargeable battery.

Usage and Maintenance

Disassembling the sealed head can cause damage to the flashlight and will void the warranty.
Fenix recommends using excellent-quality batteries.
If the flashlight will not be used for an extended period, remove the batteries, or the flashlight could be damaged by electrolyte leakage or explosion.
Turn off and lock the flashlight or remove the batteries 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 TK28R flashlight, 2 x ARB-L18-3400 batteries, USB Type-C charging cable, Holster, Lanyard, Spare O-ring, User manual, Warranty card.

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