Nitecore R40 v2 Flashlight Review

Nitecore has released a new “everything” light.  Has USB-C charging, a charge base, a car charger, a cell is included…. there’s just so much happening here!  Read on for some testing and thoughts!

Official Specs and Features

Here’s a link to the official product page.


There’s just the one version


These are going for the price of $149.95 at (referral link).

Short Review

This light seems to be a well rounded contender, aside from lacking LVP.  It’s not going to be a light purchased by the flashlight enthusiast, but it will be a solid choice for the flashlight enthusiasts parents for example.  There are so many charging options and all, that all the bases are covered.  The output is good, the charging is good.  A big downside is the proprietary 21700, but like I said, enthusiasts aren’t going to be buying this, so that will likely not matter.

Long Review

The Big Table

Nitecore R40v2
Emitter: Cree XP-L2 (V6)
Price in USD at publication time: $149.95 at
Cell: 1x”21700″ (included, proprietary)
Turbo Runtime High Runtime
Switch Type: E-Switch
Quiescent Current (A): ?
On-Board Charging? Yes
Charge Port Type: USB-C
Power off Charge Port with no Cell? No
Claimed Lumens (lm) 1200
Measured Lumens (at 30s) 1115 (92.9% of claim)*
Candela per Lumen 28.1
Claimed Throw (m) 344
Candela (Calculated) in cd (at 30s) 1065lux @ 5.542m = 32710cd
Throw (Calculated) (m) 361.7 (105.1% of claim)*
All my Nitecore 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

  • Nitecore R40v2 Flashlight
  • Nitecore NL2150DW Proprietary 21700
  • Nylon Pouch
  • Charge cable (USB to USB-C)
  • Wall plug to barrel
  • Car plug to barrel
  • Lanyard
  • Charge base
  • Spare o-ring
  • Charge base (different kind from above!)

Package and Manual

Build Quality and Disassembly

The build quality is good.  Standard Nitecore fare, which is “good enough.”

One little thing that bothered me about this charge port cover is that the cover spins around on an axis opposite that little tab.  Well if you don’t shove it down in there exactly right then the little tab isn’t in the right place for easy use next time.

The threads on the tailcap are square cut, anodized, and very smooth.  Also fairly long, but since the user will probably never take the tailcap off, that’s not a problem.

There’s a spring on both the head and tail – more on this later.  There are actually two springy parts on the head.

Not a lot going on for cooling fins, but there’s so much mass here that this too is not really a problem.

Size and Comps

Length: 159mm
Head diameter: 40mm
Body diameter: 38.6mm
Weight: 211g (288g with cell)

Retention and Carry

There’s a nylon pouch included with the purchase.  It’s a fine pouch, and the light will go into it in either direction.  The light will need to be removed for use.

There’s also a lanyard included, which attaches only on the tail area, through this hole in the body.

There is no pocket/belt clip, or plastic holster for belt use.  No other options for carry are included.

Power and Runtime

The R40 v2 runs on a “21700” battery but that’s really inaccurate – a regular 21700 cell does not work in the light.  This light requires the cell that’s included, which is seen below.

This cell is the same on both ends – that’s quite unusual…. but it does mean the cell can be inserted in either direction, and work fine.  The positive terminal is in the center, and the negative ring surrounds it.  This also means the cell can not be charged anywhere but in the R40 v2.

Upon inserting the battery, the indicating switch will flash to reveal the cell voltage.  And it blinks the actual voltage.  For example:  three blinks then a pause and 2 blinks would be 3.2V.

Here are a couple of runtimes.  I was surprised to see this light hitting over 1100 lumens – and not only that, it does so for almost an hour!  That’s quite spectacular.

High is equally well regulated, and stays at around 500 lumens for around 4 hours, which is again, impressive.

I stopped both tests while the light was still active, but the switch was indicating the cell voltage was low.  In both cases the cell was around 2.5V.  That’s lower than I’d like, and indicates there is no LVP in this light.

A charge cable is included.  It’s USB to USB-C.

The charge port for using this cable is right on the tail, and covered by a press-in attached rubber cover.

Here’s a charge test with the supplied cable.  It’s a little slow to be honest, but also reliable.  Also note at the beginning, the charging circuit smartly gets the voltage up a bit from the 2.5V (post runtime) before starting the ~1A charge.

I tested briefly with USB-C to USB-C and this also works fine.  It doesn’t appear to be Power Delivery, but charging at 5V does work this way.

Also included are a number of ways to get 12V power to a number of 12V barrel plug bases.  First is the wall plug:

Then the car plug for cigarette lighters:

And then the charge bases.  I don’t have any way to log these, but they seem to work fine.  This one in particular is a wireless charge base.

The light just sits comfortably in this ready for use at any time.

Also included is this charge base, which is a wall mount (see those two holes in the back there), and also operates on wireless charging.

Also a 12V in barrel plug.

This is so many power options…  Unfortunately one of the biggest possibilities for these charge bases doesn’t seem to be incorporated – when power goes off to the charge base, the light does not turn on.  That’s an often requested feature that I can only remember seeing in one light, and it’s not offered here.  Big swing and a miss there.

Modes and Currents

Mode Mode Claimed Output (lm) Claimed Runtime Measured Lumens Tailcap Amps
Turbo 1200 2h15m 1115 2.80
High 480 5h 506 0.94
Mid 220 11h30m 247 0.41
Low 50 48h 74 0.13
Ultralow 1 1200h 0.01


No PWM whatsoever here.  Yet on some of the other recent Nitecores there was PWM so bad it was disorienting.  I wonder how many groups at Nitecore manage electronics.

For reference, here’s a baseline shot, with all the room lights off and almost nothing hitting the sensor.  And here’s the worst PWM light I have ever owned.  Also one of the very first lights I ordered directly from China!

User Interface and Operation

There are a couple of switches on the R40 v2.  They’re both e-switches, both have indicator function, and are side-by-side on the head.

Here’s a UI table!  Note that there are two switches – one for power (has a power icon) and one for modes (has four lines).  The mode button is closest to the front of the light.

State Action Result
Off Click Power Switch (PS) On (Mode Memory)
Off Click Mode Switch (MS) No action
Off Hold MS Turbo
Off Hold PS Ultralow
On Click PS Off
On Click MS Mode Advance (ULMHT)
On Hold MS Strobe
Strobe Hold MS Strobe Advance (Strobe>Beacon>SOS)
Off Double click MS Strobe
Strobe Group Click either Off
Any Hold both Lockout (Emitter flashes to confirm)
Lockout Hold both Unlock (To Ultralow)

LED and Beam

The emitter in this light is a Cree XP-L2.  The reflector is big, deep, and smooth.  This gives a very spotted beam, which has very good reach.

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

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

Test light is on the left!

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


What I like

  • “Ultra” complete package
  • Wireless charging (two options!)
  • Wall mount
  • Meets specification for throw and output!
  • Very stable output even for turbo.
  • Extremely stable High output.
  • USB-C charging is very reliable

What I don’t like

  • Size – this is a big light
  • Proprietary 21700 cell is absolutely required
  • No real LVP – this type light should have LVP
  • USB-C charging is slow at around 1A


  • This light was provided by Nitecore for review. I was not paid to write this review.
  • This content originally appeared at  Please visit there for the best experience!
  • For flashlight related patches, stickers, and gear, head over to PhotonPhreaks, another site where I write!
  • Use my referral link if you’re willing to help support making more reviews like this one!

Author: zeroair

3 thoughts on “Nitecore R40 v2 Flashlight Review

  1. Wow, so no battery low voltage protection. If you accidentally leave it turned on the battery is ruined and you have to buy another one. Nitecore is not known for cheap batteries, either. This is disappointing and I’m not sure why they would even release a product without it.

    You say it’s not a product for enthusiasts, yet the price is way too high for anyone but enthusiasts. I’m a bit confused about who Nitecore thinks its marketing the light to.

    One other note is that you should not expect the light to turn on if charger power goes out. The one light that has that feature uses a infrared transmitter in the base and a reciever in the head and they have to line up for it to send a signal to turn on. It’s very complicated and not necessary. It’s a bit like expecting your new car to be self-driving just because one other company makes a self driving car and then your all let down because you have to drive it yourself. Maybe it was the high price that made you suspect it could have this feature?

  2. For a $150 this might be the worst trade deal in the history of trade deals, maybe ever.

  3. Also lack of LVP makes it absolutely inappropriate choice for those who are not into flashlights.

Leave a Reply