Fenix PD40R v2.0 Flashlight Review

Fenix PD40R v2.0 Flashlight Review

Fenix released the PD40R V2.0 flashlight, an updated PD40R. It boasts 3000 lumens, uses a single 21700 cell, and has USB-C charging! Read on!

Official Specs and Features

Here’s a link to the Fenix PD40R v2.0 flashlight product page.


Of the new version (the Fenix PD40R v2.0 flashlight) there is only one version.  Before this light though was the PD40R.


The Fenix PD40R v2.0 flashlight sells for $119.95 at Fenix-Strore.com

Short Review

Alright, who loves rotary lights!?!  Yes, everyone.  Fenix has a good implementation of the rotary system with the PD40R v2.0 flashlight.  It’s simple, easy to use, and reliable.  Not only all those things, but the light also blisters out very high output, too!

Long Review

The Big Table

Fenix PD40R V2.0
Emitter: Luminus SST-70
Price in USD at publication time: $119.95
Cell: 1×21700
Turbo Runtime Graph High Runtime Graph
LVP? Yes
Switch Type: Rotary Dial
On-Board Charging? Yes
Charge Port Type: USB-C
Charge Graph
Power off Charge Port With cell: Low Only
Without cell: No
Claimed Lumens (lm) 3000
Measured Lumens (at 30s) 2709 (90.3% of claim)^
Candela per Lumen 13.7
Claimed Throw (m) 405
Candela (Calculated) in cd (at 30s) 1882lux @ 4.592m = 39685cd
Throw (Calculated) (m) 398.4 (98.4% of claim)^
All my Fenix reviews!

^ Measurement disclaimer:  I am an amateur flashlight reviewer.  I don’t have $10,000 or even $1,000 worth of testing equipment.  I test output and such in PVC tubes!!  Please consider claims within 10% of what I measure to be perfectly reasonable (accurate, even).

What’s Included

what's included

  • Fenix PD40R V2.0 flashlight
  • Fenix 5000mAh 21700 cell
  • Charging cable (USB to USB-C)
  • Lanyard
  • Nylon pouch
  • Spare o-ring
  • Manual and papers

Package and Manual


Build Quality and Disassembly

feature photo

The build quality here is stellar, just like on the Fenix TK30 which I reviewed earlier this week.

These Fenix lights are well-built and robust flashlights!

Below is a top-down view!

The bezel has light design to it – not really “crenelations” but also a sort of crenelation.  I wouldn’t call these strike surfaces, though.


Only the head is removable.  The tailcap is a separate piece, but I couldn’t force it apart.

head removed

Inside the cell tube is a nice beefy spring, but on the head is just the brass contact button.

tail spring and head button

While there’s some grip that might help to remove the tailcap, again, it doesn’t come off.

tailcap reeding

The body has very fine anti-slip texture, too.

body grip

Size and Comps


  • Length: 5.4 Inches
  • Diameter: 1.3 Inches
  • Weight: 4.1 Ounces (Excluding battery)

If the flashlight will headstand, I’ll show it here (usually the third photo).  If the flashlight will tailstand, I’ll show that here, too (usually the fourth photo).

in hand

Here’s the test light with the venerable Convoy S2+.  Mine’s a custom “baked” edition Nichia 219b triple.  A very nice 18650 light.

And here’s the light beside my custom engraved TorchLAB BOSS 35, an 18350 light.  I reviewed the aluminum version of that light in both 35 and 70 formats.

beside torchlab boss 35

Retention and Carry

The Fenix PD40R V2.0 has a few carry options.  First I’ll mention the pocket clip, which comes attached from the factory.

This is a friction-fit pocket clip and has nice spring.  It only connects on the tail end, so no bezel-up carry at all.

pocket clip hug

Next is the lanyard, which attaches through one of the sets of holes in the tailcap.

lanyard holes

This is my preferred setup for lanyards since this prevents the lanyard from interfering with tailstanding.

lanyard installed

The lanyard is surprisingly simple.  Easily the cheapest part of the whole package.  A higher-quality lanyard would be a step in the right direction.

lanyard installed

You can see the two-hole tailcap allows for seamless tailstanding.

lanyard tailstand

Finally, there’s this nylon pouch.  The pouch is sufficient.  If you really need that bezel-up carry the pocket clip doesn’t provide, then just throw this pouch on your belt – the Fenix PD40R V2.0 will go into the pouch in either orientation.

nylon pouch nylon pouch nylon pouch

You won’t be able to use the light while it’s in the pouch, though.

nylon pouch

Power and Runtime

Power for the Fenix PD40R V2.0 flashlight comes from a single lithium-ion cell.  Included with your purchase is the appropriately sized cell – a 21700.

included 21700 cell

This cell is a standard button top.

included 21700 cell

The cell is installed in the normal direction – positive terminal toward the head.

included 21700 cell installed

Here are a couple of runtime graphs.  There are big stepdowns on Turbo, but the light does practically hit the specification (over 3000 lumens at startup, specifically) and within 10% at 30s, which is “close enough.”

runtime graph

The output on High is very stable, too.  Don’t get fooled by the scale here – that’s almost 2 hours at well over 1000 lumens.  That’s very good.

runtime graph

In the runtime tests, the light exhibits both low voltage warning by stepping down, and also by the indicator on the side of the head.  The light will finally shut off as seen in the test for High, in the 2.6V range.


Unlike the Fenix TK30, which included a cell that had onboard charging, the PD40R V2.0 has built-in charging on the body.  This is in the form of a USB-C port on the side.

That press-fit cover, despite opening in “the wrong way,” is actually quite snug, and feels safe.

An appropriate cable is included:  USB to USB-C.

Charging looks good at just under 2A.  This is USB-A to USB-C charging, but C to C also works.

charge graph

Here’s a charge cycle using USB-C.

charge graph

Modes and Currents

Mode Mode Claimed Output (lm) Claimed Runtime Measured Lumens Tailcap Amps
Turbo 3000 2.4h 2709 9.20
High 1000 3.1h 1134 1.93
Med 350 8.3h 421 0.59
Low 30 88.1h 41 0.05

Pulse Width Modulation

Not really any PWM is seen here – that left most (Low mode) is what I’d call “sawtooth” and not “PWM.”

For reference, here’s a baseline shot, with all the room lights off and almost nothing hitting the sensor.  Also, here’s the light with the worst PWM I could find.  I’m adding multiple timescales, so it’ll be easier to compare to the test light.  Unfortunately, the PWM on this light is so bad that it doesn’t even work with my normal scale, with is 50 microseconds (50us).  10ms5ms2ms1ms0.5ms0.2ms.  In a display faster than 0.2ms or so, the on/off cycle is more than one screen, so it’d just (very incorrectly) look like a flat line.  I wrote more about this Ultrafire WF-602C flashlight and explained a little about PWM too.

User Interface and Operation

Seen on the Fenix PD40R V2.0 is an unusual rotary dial.  There is no clicky switch at all, electronic or mechanical.  The rotary interface is touted as “the” way to flashlight by many users, and it’s easy to see why.  It’s a very reliable, trustworthy way to operate a flashlight.

I find this implementation to be good as well, but it’s difficult to operate single-handed.  If I hold the light just right, most of the time I can get lucky enough to turn the rotary, but often it’s not to exactly the mode I want (namely Low, which is first).  Being very deliberate with the holding and the action should allow accurate targeting of any mode, though.


rotary user interface

Each level has a very specific and clear detent.  There are just 5 levels, too, so nothing really confusing.

Here’s a UI table!

State Action Result
Off Rotate dial Clockwise to the first detent Low
Low Rotate dial Clockwise to the second detent Medium
Medium Rotate dial Clockwise to the third detent High
High Rotate dial Clockwise to the fourth detent Turbo
Turbo Rotate dial Clockwise to the fifth detent Strobe
Strobe Rotate dial Counterclockwise to the fourth detent Turbo
Turbo Rotate dial Counterclockwise to the third detent High
High Rotate dial Counterclockwise to the second detent Medium
Medium Rotate dial Counterclockwise to the first detent Low
Low Rotate dial Counterclockwise to the off detent Off

I wrote the table out that way so that you can see there are zero surprises in this user interface!

LED and Beam

In the Fenix PD40R V2.0 is a Luminus SST-70 emitter.  I didn’t see the CCT stated but it’s cool white.


There’s a nice deep smooth reflector to match this emitter.  It’s a very good combo!

smooth reflector

The bezel allows a little light to escape while headstanding.

crenelated bezel

Also here you can see the indicator – it’s not on the switch (remember there is no clicky!).  The indicator can be red or green.  Here it’s red, but my white balance game was very poor during the art for this post, so all apologies….


uncalibrated beam shot

These beamshots are always with the following settings:  f8, ISO100, 0.3s shutter, and manual 5000K exposure.

Tint vs BLF-348 (KillzoneFlashlights.com 219b version) (affiliate link)

I keep the test flashlight on the left, and the BLF-348 reference flashlight on the right.

I compare everything to the KillzoneFlashlights.com 219b BLF-348 because it’s inexpensive and has the best tint!


What I like

  • Massive output!
  • Hits claims for output and throw
  • Nice rotary interface
  • Very simple user interface
  • Complete package with standard 21700 cell

What I don’t like

  • Cool white emitter
  • Cheap lanyard


  • This light was provided by Fenix-Store.com for review. I was not paid to write this review.
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