Fenix TK20R V2.0 Review (3000 Lumens, SFT70 LED, 21700, USB-C)

Today I have one I am excited to bring you, it’s from a New brand on the Channel with Fenix and the TK20R V2. Through the years I have gotten a lot of questions on Fenix and what I thought of specific models and I and I just didn’t have the experience to answer, so I was excited when Fenix reached out to start working together. This is the first of 2 reviews for Fenix you will see in the coming weeks. 


The TK20R V2 is an updated light that’s using a Luminis SFT70 LED, producing 3000 lumens, has onboard USB-C charging of the 21700 battery. You can check out more at https://www.fenixlighting.com/ The light I was sent is preproduction, and actually has a Luminus SST70 LED, however that has been changed in the production light to a Luminis SFT70 LED. 


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Here is a link to the USB-C Cable I used in the video https://amzn.to/3Dwt0rA


Packaging & Accessories

I received a preproduction light, and final packaging was not ready at this time. Accessories that came with mine included a USB-A to C charging cable, the light, and the branded button top protected 21700 battery (ARB-L21-5000). Mine came with a velcro patch as well, not sure if this is normal or not. Other things that are expected to come with the production model include a lanyard, holster, 2 spare orings, user manual and warranty card.


Construction & Design

I am only going to hit the high points here, and let the photos and video do the rest of the talking. The light is made from T6061 aluminum and nicely anodized black. At the tail cap you have 2 protruding buttons, a larger round mechanical switch that takes a good amount of force to push, and then a smaller rectangle mode button. The light does not tail stand as a result.

The pocket clip only mounts on the rear of the light. The body tube has concentric ring knurling like texture on the body, this provides a good amount of grip and looks nice I think. 

The recharging port cover is worth noting here, instead of using silicone rubber covers like many manufactures do to seal the USB-C ports, Fenix’s solution on the TK20R V2 is to have a retained aluminum cover that twists one full revolution to reveal the port. It has orings at the top and bottom and lots of anodized threads, so it’s silky smooth. Also under this port cover is the battery level indicator and recharging status LED. This just makes sense to me and has nothing to catch, or get in the way like the silicone covers sometimes do. 


Internally there is a stiff spring at the front of the light as well as in the tail, threads are smooth, square cut and a bit dry. Up front the head is glued in place but the bezel is removable. There is a crenulated bezel made of aluminum protecting the AR glass lens, deep smooth reflector and nicely centered LED. 



Since this is a pre production prototype I don’t have the lanyard or holster that the light will ship with in it’s final form. What I can talk about is the pocket clip. It only attaches at the rear of the light and is relatively narrow for the lights size. It’s stiff and does a good job of retaining the light in my front pocket, with about 1” of the light sticking out. 



Size & Weight

I measured the length at 152mm, maximum diameter at the head at 34.1mm, minimum diameter in the body at 26mm. I measured the weight here with the battery and clip at 203.2g or 7.17oz so a little on the heavy side. The light is IPX8 water rated and drop resistant to 1.5M.

LED & Beam

The Fenix TK20R V2 is using the Luminis SFT70 LED in cool white. The light I was sent is preproduction, and actually has a Luminus SST70 LED, however that has been changed in the production light to a Luminis SFT70 LED. My Opple meter shows it as 6035k and 67 CRI when on in turbo. In lower lumen modes it warms up slightly to around 5600k and has a notably green tinge to the beam to my eye. The beam has a pronounced hot spot in the center and minimal spill with some tint shift noted. Parasitic Drain was measured at a very low 1.8uA. There was very minimal PWM here, it’s basically constant current. 


Below are the official outputs from Fenix. I will note the mode spacing is pretty good to the eye here. 

Official Total Outputs for the SFT70 verison

  • Turbo – 3000 Lumens
  • High – 1000 Lumens
  • Medium – 350 Lumens
  • Low – 150 Lumens
  • Eco – 30 Lumens
  • Strobe – 3000 Lumens


Heat & Runtime

For all of my runtime tests I used the included 5000mAh battery and measured the % of relative output change, not total output (lumens). Starting with Turbo it lasts for about 2:20 before reaching equilibrium. During this time the light peaks at about 45C. It runs at this equilibrium very steadily out to the 3 hour mark.

I ran the same test and compared turbo to high and to medium modes for total runtime. You can see in the graph that High in green had a few more stepdowns but ended up at a very similar total runtime as turbo. Medium is a very flat output curve out to 7:40:00 mark where it begins stepping down several times, eventually shutting off at 9:18:00 when LVP on the battery kicks in at 2.89v.



UI here is very simple. The light has 2 buttons on the rear tailcap of the light. There is the larger power button which Fenix is calling the Tactical switch, it’s a forward clicky switch with momentary, and then the smaller button which they are calling the function switch. You can half press the tactical switch to turn the light on in the last mode used before locking fully on. Once on you use the function switch to cycle through the 5 modes in a linear manner. The light does have memory mode. At anytime you can press and hold the function switch to get to strobe mode. 


I already talked about how the recharging port works on the TK20R V2, it’s under the aluminum nut that unscrews from the base of the head. It’s nice robust design. Also inside that port is your LED battery status indicator and charge indicator. When recharging it starts as red, and goes green when charged. The light is not capable of being used when charged. It does support C to C charging but has no PD charging support.  

The light is powered by a Fenix branded button top, protected 21700 battery (ARB-L21-5000) with a capacity of 5000mAh. I tested the capacity with my Vapcell S4 Plus charger and came away with 4863mAh. I tried the light with an unprotected button top battery and had no issues. 

Charging itself using the onboard USB-C port and included battery from LVP at 2.89v to full at 4.226v took 2:38:00. The light has a soft start charging when the battery is low before it jumps up to about 3A at the very beginning, and it falls as the battery charges. So a bit of a different curve then what I typically see.


Final Thoughts

I am excited to see Fenix on the channel. It’s a brand that I can find locally at two different sporting goods stores, and a LGS, which I think can be appealing to many people if you need something of quality and don’t have the time to wait for an online order. Of course they can be found online as well. 

As for the Fenix TK20R V2, It’s a pretty nice semi tactical light. The controls are easy to use, and strobe is easy to access if you want it. It has a useful beam that’s a good combination of flood and throw without making too many compromises. That said it is still cool white, and at lower tints the LED does have a pretty strong green tinge neither are my personal preference but at the higher end of the consumer market where this light is aimed won’t care like enthusiasts do. The USB Port cover design here is really nice, and I am surprised more lights don’t do something like this.

You can pickup this new release and other Fenix products at https://www.fenixlighting.com/ I will have a link in the description.