Fenix TK25 Red Flashlight

Max Lumens: 1000
Modes: 8
(13 customer reviews)

$120.00 $89.95


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The Fenix TK25 Red version flashlight features multi-colored LEDs built in an innovative mode switching operation.  This patent pending operation allows for the user to have two separate operating products in one compact flashlight.  With a simple twist of the head, the user can switch from high performance white LED flashlight mode, to the red light flashlight to support your hunting or tactical needs. The high-performance flashlight features a white light that includes 4 levels of output and variable strobe.  The Turbo setting emits a max output of 1000 lumens and beam distance of 738 feet (225 meters).  Simply twist the head and your light is transformed into red LED operation with a max of 310 lumens.

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: 1000
Modes: 8


fenix tk25r flashlight specification chart

Flashlight Size:

Length: 5.61” (142.6mm)
Diameter: 1.0” (25.4mm)
Head: 1.57” (40mm)

Flashlight Weight:

5.52 oz. (156.5g) excluding battery


One 18650 rechargeable Li-ion batteries or two 3V CR123A Lithium batteries


Lanyard, holster, spare O-ring, body clip


Limited Lifetime Guarantee from Fenix Lighting US

Notice: The listed flashlight parameters (lab-tested by using one Fenix 3.6V/3500mAh Li-ion battery) may vary between flashlights, batteries and environments.

Additional Features of the TK25 Red Flashlight

  • Cree XP-G2 S3 and XP-E2 red LED’s with lifespan of 50,000 hours
  • Rotary flashlight head for free switching between white and red lights
  • Compatible with AER-03 remote pressure switch
  • Digitally regulated output maintains constant brightness
  • Reverse polarity protection, to protect from improper battery insertion
  • Tactical tail switch for momentary on activation
  • Functional tail switch for output selection and instant strobe
  • Made of durable high-strength and oxidation-resistant aluminum
  • Premium type HAIII hard-anodized anti-abrasive finish
  • Toughened ultra-clear glass lens with an anti-reflective coating

Notice: The mentioned parameters (lab-tested by using one Fenix 3.6V/3500mAh rechargeable Li-ion battery) may vary between flashlights, batteries and environments.

Operating Instruction

Dual Switches

The round switch is the tactical switch and the oval switch the functional switch.


Tap the tactical switch to momentarily turn on the light; the light will activate the last memorized output on White light mode, or last memorized output on Red light mode; release and the light will go out.

Fully press the tactical switch to constantly turn on the light. Press again to turn off the light.

With the light switched off, press the functional switch for instant strobe activation on White light mode, or to enter Red high on Red light mode, release it and the light will go out.


With the light switched on on White mode – long press the functional switch to activate strobe. Click once again to return to previous output.

Output Selection

With the light on on White mode – single click the functional switch to cycle through Low→Med→High→Turbo.

With the light on on Red mode – single click the functional switch to cycle through Low→Med →High.

Mode Switching

Rotate the light head to switch between white and red light modes.

Intelligent Memory Circuit

The light memorizes the last selected brightness level on White and Red light modes. When turned on again the previously used brightness level will be recalled.

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 mode, the flashlight blinks three times every five minutes to remind you to replace the battery. To ensure normal use, the flashlight will not turn off automatically and will work till the battery runs out completely. (White light flashes on White light mode and Red flashes on Red light mode.)

Overheat Protection

The light will accumulate a lot of heat when used on Turbo output level for extended periods. When the light reaches a temperature of 65°C or above, the light will automatically step down by a few lumens to reduce temperature. When the temperature is reduced, the output will gradually return to Turbo output level.

Battery Replacement

Unscrew the tail cap to insert the battery with the anode side (+) towards the light head, then screw the tail cap back on.

Usage and Maintenance

  • Disassembling the sealed head can cause damage to the light and will void the warranty.
  • Fenix recommends using an excellent quality battery.
  • If the light will not be used for an extended period, remove the battery, or the light could be damaged by electrolyte leakage or battery explosion.
  • Unscrew the tail cap half a turn 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 battery contacts improves the lamp’s performance as dirty contacts may cause the lamp to flicker, shine intermittently or even fail to illuminate for the following reasons:

A: The battery needs replacing.
Solution: Replace battery (Ensure battery is inserted according to the manufacturer’s specifications).

B: The threads, PCB board contact or other contacts are 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.


This flashlight is a high-intensity lighting device capable of causing eye damage to the user or others. Avoid shining the flashlight directly into anyone’s eyes.

13 reviews for Fenix TK25 Red Flashlight

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  1. Thomas J. (verified owner)

    A very fine flashlight, well made and high performance but you will need a high performance battery to go with it. It will drain a common 18650, in less than an hour, to a level that dims the light automatically. Don’t over use the turbo setting unless you have a spare battery in your pocket. I guess I will buy one of Fenix’s 4000 Mh batteries.

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    • Dianne (store manager)

      What battery were you using that was draining the battery in less than an hour?

  2. Anonymous (verified owner)

    Wish it was slightly smaller with the same red lumen capability but other than that, love it.

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  3. Robert Gawlinski (verified owner)

    Great for trekking and returning from deer hunting stands during night hours. Red function is perfect for illuminating tree tacks, blazes, etc. without brightly lighting woods as you travel.

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  4. Don Barranco (verified owner)

    Awesome light. Twin LED’s and with a twist of the wrist you have a bright white light or a bright red light. I bought it for the red, the white is a bonus! Big button, easy to operate in the dark. Smaller button to “step down” the brightness two times depending on your situation.
    I have many lights, Streamlight, Sure Fire, Fenix, Nebo and none hold up as well or deliver as well as the Fenix.
    I am not a paid endorser, you can take it to the bank.

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  5. Scott (verified owner)

    This is perfect for my hunting, fits my rifle mounts easily but Im thinking I should have gone with the red, blue white, because guys are supposed to be color blind (>: Nice stuff these lights.

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  6. Jeffrey Beer (verified owner)

    I used my TK25 Red for the first time the other night. I bought it to use while shooting photographs of the night sky. The red LEDs really help to maintain night vision.

    As expected, being a long-time user of Fenix flashlights, it performed flawlessly. The ability to switch from white light to red so easily really makes it a winner.

    Now if it had a special mode for seeing spider webs hanging right in front of my face, and the associated spiders, they would really have something! I think I ate a few while bushwhacking down to the water’s edge.

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  7. Robert G. (verified owner)

    Works great

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  8. Matthew U. (verified owner)

    Absolutely killer light (in a good way). Very bright clear light. The red LED is absolutely phenomenal. Being in the Navy on the high seas a red light flashlight is crucial and my shipmates are jealous of mine. This light is one of my favorites, however, all my favorites are Fenix. Fenix has NEVER let me down.

    2 out of 2 people found this helpful. Was this review helpful to you?
  9. Francis W. (verified owner)

    Mounted to my AR. I like the multiple brightness settings which allow me to use up to max brightness outdoors and lower brightness indoors. The max setting on the red light is much brighter than expected. I’m ordering another.

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  10. Anonymous (verified owner)

    Great light for night use. Red light is blinding on high.

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  11. George Kreke (verified owner)

    I wish the switch was on top.

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  12. Chris

    I compared this model to the TK25 R and B light and the reason I chose this light was for preserving my night vision. I will use it for amateur astronomy and camping. Because there is a physical separation between white and red light this is the ideal tool for astronomers because there is no way that I could inadvertently activate anything but red light even by accident while I have this rotated to the R “red” position. This makes the light as far as I can tell unique. The wavelength if I were to guess is around 620nm. I looked at the spec sheets on CREE’s website and they only advertise lumen output @ 350mw and Fenix shows 5500mw’s on their diagram so I can’t figure out what the wavelength is but rest assured it is a nice deep red and suits my needs perfectly.

    1 out of 1 people found this helpful. Was this review helpful to you?
  13. Bert Macklin

    I can’t tell you how hard it is to find a solid red light flashlight, but by God Fenix has done it. This isn’t some rinky dink red light. I use it for stargazing, it doesn’t wreck your night vision like a white light will, and this sucker is powerful. Highly recommend, and customer service was great as well.

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