Fenix TK75 Flashlight

Max Lumens: 5100
Modes: 8
(28 customer reviews)

$290.00 $219.95

Out of stock

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.

For commercial orders and large purchases, contact us at (888) 775-9996 x6, or
WARNING. Be aware of counterfeit Fenix merchandise in the U.S. marketplace.

Max Lumens: 5100
Modes: 8


fenix tk75 flashlight specifications chart


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


22.2 oz. (630g) excluding 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.


Shoulder strap, lanyard, two spare O-rings


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.

Additional Features of the Fenix TK75

  • 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.

Please ensure the insulation sheet of the battery is removed before use.


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.

28 reviews for Fenix TK75 Flashlight

5 star
4 star
3 star
2 star
1 star
Powered by Customer Reviews plugin
Showing 5 of 28 reviews (4 star). See all 28 reviews
  1. jim baird

    I have been using this flash light almost every day for the 2 years I have owned it.. On the lowest power I can use it to read in bed for hours at night. Higher settings I use it for working under my truck, highest settings I use it to see what’s moving out in the woods. Love it EXCEPT Broke lens, can’t replace it.?

    3 out of 4 people found this helpful. Was this review helpful to you?
    • Dianne (store manager)

      I will have someone from warranty reach out to you about replacing the lens on that.

  2. ndfan77

    Awesome flashlight. But only four stars because I cannot find an easy way to buy an additional 2018 TK75 battery carrier so all four 18650 batteries can be quickly swapped when needed. A second battery carrier would let me keep another set of batteries plugged into a USB charger while the first set is in use, and be fully charged when the first set runs low, and be able to quickly (did I mention quickly), switch the depleted set with the charged set.

    To summarize, being able to purchase a second 2018 TK75 battery carrier would allow:
    — Quickly change all four 18650 batteries when the active set rund low.
    — Not having to individually remove each 18650 battery in order to charge them (which isn’t exactly easy).
    — Keep a spare set of 18650 batteries fully charged and ready when needed.

    Please, please, offer the 2018 TK75 battery carrier (with USB charging) as a separate purchase option!

    15 out of 15 people found this helpful. Was this review helpful to you?
  3. Alexander W. (verified owner)

    Very bright light! I also bought the extension for longer light. It gets however really hot and is pretty big / clunky.

    3 out of 4 people found this helpful. Was this review helpful to you?
  4. Anonymous (verified owner)

    Light weight and powerful! Gives me extra peace of mind as a woman living in the boonies by myself.

    2 out of 2 people found this helpful. Was this review helpful to you?
  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)?

    1 out of 3 people found this helpful. Was this review helpful to you?
Add a review

Your email address will not be published. Required fields are marked *