Fenix TK75 Flashlight – 2018 Edition

Rated 4.50 out of 5 based on 2 customer ratings
(2 customer reviews)

The newly upgraded Fenix TK75 Flashlight now blasts an astonishing 5100 lumens just over a half of a mile (850m) by utilizing a unique quad lighting system featuring cutting-edge CREE LEDs. Easily turn on the flashlight and choose between six lighting levels and two flashing modes with the dual stainless steel side switches. Use the lock-out function to prevent accidental operation and the new innovative battery holder allows you to easily recharge the four 18650 Li-ion batteries (not included with base model) via a micro USB port. A multi-function socket allows you to attach the included shoulder strap and mount to a tripod. Waterproof and dust proof, the TK75 Flashlight is the ultimate tool for those that have the most demanding lighting needs.

$290.00 $219.95

4.50 out of 5


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Max Lumens: 5100
Modes: 8

Length: 7.4″ (188mm)
Body: 2.1″ (53mm)
Head: 3.4″ (86mm)

Weight: 22.2 oz. (630g) excluding batteries

Batteries: Four 18650 rechargeable Li-ion batteries (not included in base model) NOTE: The light will not work with flat-top 18650s.  We recommend any of the ARB-L18 series from Fenix.

Included: Shoulder strap, lanyard, two spare O-rings

Warranty: Limited Lifetime Guarantee from Fenix Lighting USA

The parameters (lab-tested by using four Fenix ARB-L18-3500 3.6V/3500mAh rechargeable Li-ion batteries) may vary between flashlights, batteries and environments.
MODE Lumens
Impact Resistance
Eco 50 95h 279ft (85m) 1800cd
Low 150 46h 482ft (147m) 5400cd
Med 450 17h 45min 843ft (257m) 16500cd
High I 1000 6h 1204ft (367m) 33600cd
High II 2000 3h 1696ft (517m) 66800cd
Turbo 5100 2h 15min 2789ft (850m) 180600cd
1m IP68, waterproof underwater to 2m/dust proof
Additional Features
  • Four Cree XHP35 HI LEDs with a lifespan of 50,000 hours
  • Powered by four 18650 rechargeable Li-ion batteries (Not included in base model)
  • Micro USB rechargeable battery holder
  • Momentary on (turbo and strobe)
  • Battery level indicator
  • Lock-out function
  • Dual stainless steel side switches
  • Digitally regulated output maintains constant brightness
  • Reverse polarity protection to protect from improper battery insertion
  • Low-voltage warning reminds when battery charging is needed
  • Made of durable aircraft-grade aluminum
  • Premium type III hard-anodized anti-abrasive finish
  • Toughened ultra-clear glass lens with an anti-reflective coating

Operating Instruction

Master switch: the right one, controls General mode and output selections.

Auxiliary switch: the left one, controls Flash mode output selections.

With the light turned off, press and hold the Master switch for 0.5 seconds to enter General mode, press and hold the Auxiliary switch to enter Flash mode.
With the light turned on, press and hold the Master or Auxiliary switch to turn off the light.

Mode Switching
In General mode, single click the Auxiliary switch to enter Flash mode.
In Flash mode, single click the Master switch to enter General mode.

Output Selection
With the light on General mode, single click the Master switch to cycle through Eco→Low→Med→High I→ High II→Turbo.

With the light on Flash mode, single click the Auxiliary switch to cycle through Strobe→SOS.

Instant Turbo
In any status with the light unlocked, press and hold the Master switch for 1.2 seconds to enter Turbo mode, click once on any switch to enter the last-used General mode.

Instant Strobe
With the light off and unlocked, press and hold the Auxiliary switch for 0.5 seconds to enter Strobe mode, or single click the Auxiliary switch on General mode to enter Strobe mode.

Intelligent Memory Circuit
The light memorizes the last selected brightness level on General mode. When turned on again the previously used brightness level will be recalled.

Battery Level Indication
When the light is off, single click the Auxiliary switch, the battery level indicator between the switches will display the battery status for 3 seconds. (Single click the blue button on the battery holder to check the battery status with the battery level indicator displayed).

  • Green constant on: saturated
  • Green flashes: sufficient
  • Red constant on: poor
  • Red flashes: critical

*This only works on 18650 Li-ion rechargeable batteries.

Lockout Function
Lock: With the light unlocked, simultaneously press the two switches for 3 seconds, the light will blink twice to indicate locked status.

Unlock: With the light is locked, simultaneously press the two switches for 3 seconds, the light will be unlocked and activated on last used brightness.

In locked status, clicking or pressing the switches will activate 2 one-second blinks to indicate locked status.

Intelligent Overheat Protection
The light will accumulate a lot of heat when it is working at Turbo mode and therefore has two levels of protection.  1) When the light is overheated up to 65 ℃ (149 F) or above, the flashlight will automatically downshift the output to 2500 lumens or 2) when the temperature is lower than 65 ℃ (149 F), after 3-minute working on Turbo, the light will slowly downshift to 2500 lumens within 30 minutes, to protect from high surface temperature and avoid risk of damaging your light.

Low-voltage Warning
When the voltage level drops below the preset level with the light switched on, low voltage warning will be activated automatically, then the battery level indicator between the switches will display red to remind battery replacement or charging. The flashlight is programmed to step down automatically to a lower brightness level until Eco output is reached. To ensure normal use, the flashlight will not turn off until the battery level runs out or once the battery over-discharging protection activates.

Note: This only works on 18650 Li-ion battery.

The battery holder features charging function with a standard Micro USB port.

  1. Take the battery holder out of the light, plug the USB port of the charging cable into any USB power supply. and plug the Micro USB side of the charging cable into the charging port of the battery holder.
  2. The charging indicator will display red while charging, and will turn to green when fully charged.

Note: Avoid contact with conductive objects like coins, screws, and keys when removing the battery holder from the light, to protect from static discharge which will damage the circuit boards

Battery Replacement
Unscrew the tail cap to take out the battery holder, and then insert the batteries in accordance with the polarity marks. After loading the batteries into the holder, insert the holder with its convex top towards the light head. Screw the tail cap back on.

Reviews (2)

2 reviews

  1. Rated 5 out of 5

    Erik Roderick (verified owner)

    Insanely bright light! I think i giggled when i turned on this light to full power the first time. I am still impressed every time i use it! Fit and finish are flawless. No rattles! The only con is their is no external charging port not enough to take a star away. Totally satisfied!

  2. Rated 4 out of 5

    Bruce (verified owner)

    As usual Fenix has produced an excellent product. My only complaint is with the dual switches and how the light turns on. Going into a flash mode and then you have to press another button to go into the mode of your desire. Very confusing and awkward, to say the least.

    Is it possible to program to do to the mode of choice (to a default mode of choosing)?

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