Fenix TK35R Rechargeable High-Performance Tactical Flashlight

Performance Highlights

• Spotlight: 5800-lumen Burst output reaching 610 meters (2001 ft).
• Dual Configuration: Available in Red Light or UV Light auxiliary versions, sharing the same white-light performance.
• Durability: 1-meter impact resistance and IP68 waterproof rating.

Full mode-by-mode output, runtime, distance, and intensity figures are shown in the specifications chart above.

Key Features

• Four Luminus SFT25R LEDs for white light, plus a Luminus SST08 365nm UV LED (UV version) or Cree XEG red LED (Red version).
• Flexisensa toggle switch selects White/General, Lockout, and the secondary light mode; dual tail switches give instant Burst and instant Strobe.
• UV variant: high-precision 365nm UV LED useful for authenticating documents and security codes; battery indicator alternately flashes red/green as a reminder when UV light is left on.
• Red variant: preserves night vision for tactical, hunting, and low-light signaling use, with the same red/green reminder behavior.
• Sliding USB-C charging port cover and intelligent overheat protection.

Battery & Charging

• Included: Two Fenix ARB-L18-4000 rechargeable 4000mAh 18650 batteries.
• Charging: USB-C, about 2 hours with a 9V/3A adapter or about 4 hours with a 5V/2.4A adapter.
• Compatible: Fenix ARB-L18 series 18650 batteries — do not use 16340 or 21700 batteries.

Size & Weight

• Dimensions: 6.06" length x 1.69" head diameter.
• Weight: 12.06 oz including batteries.

Q: What kind of LEDs are used in TK35R? Does Fenix offer to replace LED?

A: The Red Light version utilizes four Luminus SFT25R LEDs and one Cree XEG red LED. The UV Light version utilizes four Luminus SFT25R LEDs and one Luminus SST08 365nm UV LED. All LEDs have a lifespan of 50,000 hours; Fenix does not offer LED replacement service.

Q: What is the color temperature of TK35R?

A: Around 6500 - 7500K.

Q: What is the working voltage of TK35R?

A: 3.0 V - 4.2 V.

Q: Is TK35R rechargeable? How long is the charging time?

A: Yes, the TK35R is rechargeable with its USB Type-C charging port. The normal charging time is approximately 2 hours from depleted to fully charged with a 9V/3A charging adapter.

Q: How to prevent accidental activation of the TK35R?

A:
Solution 1: Turn off the flashlight and unscrew the light body a few turns or take out the batteries.
Solution 2: turn the toggle switch to the Lockout mode to lock the flashlight.

Q: Why does the TK35R downshift to a lower mode after being used for a while and the higher mode cannot be selected?

A: There are two reasons:
1. Intelligent Overheat Protection
The flashlight will accumulate a lot of heat when used at high output levels for extended periods. When the light reaches a temperature of 60°C or above, the light will automatically step down a few lumens to reduce the temperature.

2. Low-voltage Warning
When the voltage level drops below the preset level, the flashlight is programmed to downshift to a lower brightness level until the lowest output is reached.

Q: Why does the TK35R sometimes flicker?

A: The reasons that may cause the light to flicker, shine intermittently or even fail to illuminate:
1. Poor battery level.
Solution: Recharge or replace the batteries.

2. The contact or contact point of the batteries or flashlight is dirty.
Solution: Clean the contact points with a cotton swab soaked in rubbing alcohol.

If the above methods don't work, please contact your authorized distributor.

Q: What kind of batteries can be used in TK35R?

A: It is recommended to use two Fenix ARB-L18-4000 batteries. Batteries from the Fenix ARB-L18 series are also recommended. Other Li-ion batteries are not recommended. As unmatched batteries may cause the flashlight to fail to work normally.

Condensed from the manufacturer's official manuals for the Fenix TK35R rechargeable tactical flashlight. The TK35R is available in two light-source variants, UV Light and Red Light, sharing the same body and white-light performance. Downloadable PDF versions for each variant are on this page.

Overview

• 5800 lumens maximum white-light output and 610 meters maximum beam distance
• Utilizes four Luminus SFT25R LEDs, plus either one Luminus SST08 UV LED (365 nm) or one Cree XEG red LED, depending on variant
• Powered by two included Fenix ARB-L18-4000 batteries
• Flexisensa toggle switch for seamless switching among General/White mode, Lockout mode, and the secondary light mode (UV or Red)
• Silent dual tactical switches at the light tail for instant burst/turbo and instant strobe
• USB Type-C charging port with sliding port cover
• Battery level indication and low-voltage warning
• Intelligent overheat protection
• Made of high-intensity aluminum alloy
• Size: 6.06'' x 1.69'' / 154 x 43mm
• Weight: 12.06 oz / 342 g (including batteries)

Technical Parameters (ANSI/PLATO FL1) — White Light

• Turbo/Burst: Output 5800 lumens, Runtime 3 h*, Distance 610 m, Intensity 93,000 cd
• High: Output 2000 lumens, Runtime 3 h 15 min, Distance 370 m, Intensity 35,000 cd
• Med: Output 800 lumens, Runtime 4 h, Distance 230 m, Intensity 13,300 cd
• Low: Output 350 lumens, Runtime 9 h 20 min, Distance 150 m, Intensity 5,800 cd
• Eco: Output 30 lumens, Runtime 105 hours, Distance 30 m, Intensity 500 cd
• Strobe: Output 3000 lumens

Impact Resistance: 1 meter | Waterproof Rating: IP68

*Turbo/Burst runtime includes reduced-output time from thermal/protection step-down. Specs measured by Fenix using two ARB-L18-4000 batteries at 21±3°C / 50–80% humidity; real-world performance varies.

UV Light Variant

• UV High: Output 3 W, Runtime 7 h 30 min
• UV Low: Output 1.5 W, Runtime 14 h 30 min

A high-precision 365 nm UV LED, useful for authenticating documents, credentials, and security codes. Since UV light is largely invisible to the eye, the battery indicator alternately flashes red and green as a reminder whenever the UV light is left on, to prevent accidentally draining the battery.

Red Light Variant

• Red (High): Output 260 lumens, Runtime 10 h 30 min, Distance 24 m, Intensity 150 cd
• Red (Low): Output 15 lumens, Runtime 91 hours, Distance 6 m, Intensity 9 cd
• Red Flash: Output 15 lumens

Red light preserves night vision and is commonly used for tactical, hunting, and low-light signaling use. The battery indicator alternately flashes red and green as a reminder whenever the Red light is left on.

Operating Instructions

Mode Switching: rotate the toggle switch to the left end for White/General mode, to the right end for the secondary mode (UV or Red, depending on variant), and to the middle for Lockout/off mode.

On/Off: with the light off and unlocked, tap the tactical switch to turn the light on silently (release to go out), or fully press the tactical switch to turn it on constantly (press again to turn off).

Instant Turbo/Burst: with the light off and unlocked, fully press the tactical switch for 0.5 seconds to enter maximum output and stay there; single-click the functional switch to shift to Eco, or fully press the tactical switch to turn off.

Strobe: with the light on, press and hold the functional switch for 0.5 seconds to enter Strobe (White mode) or the flash mode of the active secondary light. Single-click the functional switch or tap the tactical switch to recall the previous output.

Output Selection: in White/General mode, single-click the functional switch to cycle Eco → Low → Med → High → Turbo/Burst. In the secondary mode, single-click to toggle between the High and Low levels of that light source.

Intelligent Memory Circuit: the light remembers the last-used output level (excluding Strobe/flash modes) and recalls it the next time it's turned on.

Battery & Charging

Uses two Fenix ARB-L18-4000 (or ARB-L18 series) 18650 batteries, 3.6V, included. To replace: unscrew the light body and insert the batteries anode side (+) toward the light head, then screw the body back on. Do not use 16340 or 21700 batteries, and don't mix battery brands, sizes, or types.

To charge: slide open the port cover on the light tail and connect the included USB Type-C cable. The indicator glows red while charging and turns green when full. Charging takes about 2 hours with a 9V/3A adapter, or about 4 hours with a 5V/2.4A adapter. Recharge a stored light every four months to maintain optimum battery performance.

Battery Level Indication

Each time the light is turned on, the indicator briefly shows battery status (lasts 3 seconds); works with Fenix ARB-L18 series batteries.

• Green, on: 100–85%
• Green, flashing: 85–50%
• Red, on: 50–25%
• Red, flashing (fast): 25–1% (recharge soon)

Protection Features

Intelligent Overheat Protection: at 60°C/140°F or above, the light automatically steps down a few lumens to cool down, then gradually restores the preset output once temperature drops.

Low-Voltage Warning: as the battery depletes, output automatically downshifts; at the lowest output the indicator blinks red slowly as a reminder to recharge or replace the battery. The light stays on until the battery runs out or protection triggers, rather than shutting off automatically.

Care & Maintenance

• Do not disassemble the sealed head — this voids the warranty.
• Use only high-quality, protected batteries; low-quality or mishandled batteries are a fire/safety risk and are not covered by Fenix warranty.
• Remove the batteries for storage if the light won't be used for an extended period, to avoid electrolyte leakage.
• Lock the light or remove the batteries during storage/transport to prevent accidental activation.
• Replace the O-ring with an approved spare if it shows wear, to maintain the waterproof seal.
• If the light flickers or won't turn on, clean the battery contacts with a rubbing-alcohol-soaked cotton swab.

What's Included

Fenix TK35R flashlight (UV or Red light variant), 2 x ARB-L18-4000 batteries, USB Type-C charging cable, holster, lanyard, spare O-ring, product leaflet, and warranty card.