Acebeam L19 V2.0 Flashlight Review

Acebeam L19 V2.0 Flashlight Review

Acebeam has updated the L19 flashlight to v2.0! It has a Luminus SFT-40 and uses a single 21700 (included). Read on for testing!

Official Specs and Features

Here’s a link to the Acebeam L19 V2.0 flashlight product page.


This is obviously version 2 of the L19. It offers a few updates, including (mainly) this Luminus SFT-40 emitter. There are some cosmetic changes too.


The Acebeam L19 V2.0 flashlight goes for $119.90 and is available on Acebeam’s website now.

Short Review

I’m a big Acebeam fan. This thrower meets the expectations of a thrower and has a very nice dual-switch interface.

Long Review

The Big Table

Acebeam L19 V2.0 Flashlight
Emitter: Luminus SFT-40 (6500K)
Price in USD at publication time: $119.90
Cell: 1×21700
Turbo Runtime Graph High Runtime Graph
Switch Type: Both
Quiescent Current (mA):
On-Board Charging? Yes
Charge Port Type: USB-C
Charge Graph
Power off Charge Port
Claimed Lumens (lm) 2200
Measured Lumens (at 30s) 1250 (56.8% of claim)^
Candela per Lumen 216.2
Claimed Throw (m) 1083
Candela (Calculated) in cd (at 30s) 6800lux @ 6.412m = 279573cd
Throw (Calculated) (m) 1057.5 (97.6% of claim)^
Claimed CCT 6500
Measured CCT Range (K) 6100-7600 Kelvin
Item provided for review by: Acebeam
All my Acebeam 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

Acebeam L19 V2.0 flashlight what's included

  • Acebeam L19 V2.0 flashlight
  • Acebeam 5100mAh 21700
  • Spare o-rings (2)
  • Spare switch cover
  • Charge Cable (USB to USB-C)
  • Nylon pouch
  • Lanyard
  • Manual and papers

Package and Manual

Acebeam L19 V2.0 flashlight box Acebeam L19 V2.0 flashlight lens cover

Acebeam L19 V2.0 flashlight manual

Build Quality and Disassembly

Acebeam L19 V2.0 flashlight

Like practically all other Acebeam lights, this L19 has fantastic build quality. Also like the original L19, this light has a great shape for a handheld thrower. The two are very similar, really differing only in the emitter choice, as well as some minor cosmetic things. For example, this one has a black bezel.

The head end has cooling fins of minimal depth.

Acebeam L19 V2.0 flashlight bezel

Threads on the cell tube are very smooth.  They’re unanodized, square cut, well lubed (maybe a bit extra lube), and somewhat long.  All in all, very good user experience when removing the tailcap. The tailcap has a spring and some other contacts there for the e-switch magic.

Acebeam L19 V2.0 flashlight tailcap off and threads

The head end also has a beefy spring, too.

Acebeam L19 V2.0 flashlight head spring

Size and Comps

163.8mm (LENGTH) X 60mm (HEAD DIAMETER) X 25.4mm (TUBE DIAMETER)

Weight: 266g (6.91OZ.) including 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).

Acebeam L19 V2.0 flashlight 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.

Acebeam L19 V2.0 flashlight beside torchlab boss 35

Here are the two L19’s side by side.

Retention and Carry

First there’s a tactical ring which offers a lanyard connection point.

Acebeam L19 V2.0 flashlight lanyard loop on tactical ring

This ring feel metal but I’m not completely sure if it’s metal or hard plastic.

Acebeam L19 V2.0 flashlight lanyard loop on tactical ring

Acebeam L19 V2.0 flashlight lanyard installed Acebeam L19 V2.0 flashlight lanyard installed

Next is the nylon pouch, which is the same as used for the L19 previously.

Acebeam L19 V2.0 flashlight nylon holster

This is a directional pouch and allows for bezel-up carry only.  The light will not go into the pouch in the other direction.

You’ll note that this means the tactical ring goes through the small end of the pouch.  When removing the light, the tactical ring will catch a bit.   The tactical ring is removable (though it is very reluctant to slide over one of the o-rings (a good thing)), and if you use the light in this pouch but don’t really need the tac ring, you’ll likely want it removed for ease of access.

Acebeam L19 V2.0 flashlight nylon holster

There is no pocket or belt clip.

This is a tactical light, though, and Acebeam does offer a number of related accessories. There’s a rail mount of some sort, for example. A remote switch is available, too.

Power and Runtime

Power to the Acebeam L19 V2.0 flashlight is from a single lithium-ion cell.  My package included a cell, and I think now (as opposed to the option on the original), the cell is included at the purchase price.  The cell is a 5100mAh 21700.

Acebeam L19 V2.0 flashlight included 21700 cell

The cell is a button top.

The cell is installed into the L19 in the usual way – positive terminal toward the head.

Acebeam L19 V2.0 flashlight included 21700 cell installed

The included cell fits well, but a flat top unprotected cell also fits and works.

Here are a few runtimes. While I love the bezels like this, which have flutes (or “teeth”) that allow light to escape when headstanding, this does affect runtime tests in a way that I haven’t yet been able to correct for.  When any light escapes this way, it’s not captured in these tests.  As a result, the total output is definitely higher than what I see below, but by how much I am not sure. Also, this beam is very throwy, which might not be picked up perfectly in my “consumer-calibrated” measuring device. More important than the total output being below the claim, the throw is on the mark. So I wouldn’t really worry much about the measured output being lower (much lower) than the claim.

On bench power, the low voltage characteristics are as follows:

3.1V:  red indication
2.9V: red flash indication
2.7V:  light is off

While we’re on the topic of power, note that this LED indicator does provide cell power information.

The LED on the head near the switch also indicates power, as follows:

Green: >30% power
Red: Between 10 and 30% power
Red Flashing: <10% power


This cell has a USB-C charge port in the head!

Acebeam L19 V2.0 flashlight included 21700 cell

Not only that but there’s a charge indicator on the positive end of the cell. This is a bit different from the cell formerly sold by Acebeam, though. The indicator is hidden behind that white ring.

Acebeam L19 V2.0 flashlight included 21700 cell

Also included is a charging cable.  It’s a short cable with USB on one end, and USB-C on the other.  The USB end has a female USB port too, for using the cell as a powerbank (!!!).

Acebeam L19 V2.0 flashlight charging cable Acebeam L19 V2.0 flashlight charging cable

Here’s a charge graph.  This is from USB power (not USB-C).  Charging is good, but just a bit slow at around 1A.  That’s around 0.2C, which is fantastic for your cell life but requires five hours to complete.

C to C charging works just fine on the cell, too!


The data below is from the L35 test, but the cell being used is the same model.

You may wonder, with a charging cable of that sort, can this cell be used as a powerbank?!  Well, the answer is YES.  The L19 product page does not cover this (probably because the cell is technically a separate product).  And the cell product page does not cover it either, so I just had to poke around for maximums.  Looks like the cell is good to around 1.2A output while staying at (or nearly) in USB spec.  With the 5100mAh capacity, you’re likely to get a cell phone charge out of it.  Here’s a couple of graphs.  This covers a ramp-up to max before the output shuts off, and also (then) a steady run of around 1.2A output from the cell powerbank.

Here’s some detail just of the first ~1m.  I take the discharge up to the point it shuts off, and then restart it.  Then I set the output to around 1.2A.  When the voltage dropped out of range, I lowered the draw to around 0.8A.

In powerbank mode, the cell will stop outputting current at around 2.9V.

Modes and Currents

Mode Mode Claimed Output (lm) Claimed Runtime Measured Lumens Tailcap Amps
Turbo 2200-1600-1200 1m50s-10m-1h26m 1250 7.32
High 1200 1h38m 745 2.40
Mid2 630 4h8m 395 1.02
Mid1 300 9h45m 189 0.44
Low 100 30h5m 63 0.14
Moonlight 1 62d 0.4 0.00

Pulse Width Modulation

The L35 does not have PWM on any mode!  That’s great.  And one of the things I love about Acebeam flashlights.

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 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

The user interface here is exactly the same as on the L35 and original L19.  I do think these two would be a good pair.  L35 for massive output, and L19 for massive throw.

There are two switches on the Acebeam L19 V2.0 flashlight. First is this tailcap switch, which feels to me to be a mechanical switch.  It clicks very positively and has a forward clicky action.  This means there’s a momentary option.

Acebeam L19 V2.0 flashlight tail switch Acebeam L19 V2.0 flashlight tail switch

This switch sits under the tailcap, and so tailstanding works just fine.  The tailcap is nice, in fact – it’s a “tripod” style and not the bi-pod popular on many other lights (such as the Convoy S2+).

Acebeam L19 V2.0 flashlight cigar grip

There’s also a replacement tailcap that adds a remote pressure switch to this Acebeam L19.  I don’t have that, but I can say that it’d probably be great for long(er) gun usage!

Also for the operation of the L19 is a side e-switch.  The switch has a metal cover and is completely flush with the body.  It’s possible to find the switch without looking, because the opposite side has cooling fins, and is therefore not smooth.

Acebeam L19 V2.0 flashlight e-switch

The UI’s a little interesting, but quite easy.  The tailswitch takes absolute precedence.  No matter if the light is on or off, or on through one of the e-switch modes, clicking the tailswitch into the on position will always yield turbo.  Reliable switches are useful.

Here’s a UI table!

State Action Result
Off (and unlocked) Click Tail Switch (TS) Turbo
Off (and unlocked) Tap TS Momentary Turbo
Off Click Side Switch (SS) On (Mode memory (excluding Moonlight and Turbo))
Off Hold SS Moonlight
On (by TS action) Any SS action No change in state
On (by SS action) Hold SS Mode advance (L>M1>M2>H)
Off Double Click SS Turbo
On (by SS action) Double Click SS Turbo
Turbo (from SS) Double Click SS Previously used mode
Any (except Turbo from TS) Triple Click SS Strobe
Off Hold SS 5s Lockout (Indicated by triple flash in Moonlight)
Lockout Hold SS 3s Unlock to Moonlight^

^ The tailswitch must be in the off position to unlock!  The manual states that the power indicator can show whether the tailswitch is “on” or “off” but doesn’t state how, and I’m unclear on this.  It’s possible to do this by feel though.  When “off” the tail switch button is quite firm.  When “on” the tailswitch has around 1.5mm-2mm of give.

LED and Beam

Probably the main update for this new version is the emitter. This is a Luminus SFT-40 emitter.

Acebeam L19 V2.0 flashlight emitter and TIR

This emitter benefits from a TIR.  I believe the TIR has a lens over the top, but I can say for certain that the front is smooth (ie you can’t feel that little center circle).

Acebeam L19 V2.0 flashlight TIR

Due to the toothy bezel, light does/will escape when headstanding.

Acebeam L19 V2.0 flashlight bezel teeth

This little indicating LED in the head is not directly opposite to the e-switch, it’s only 90 degrees to the side. So in the photo below, the e-switch is in that flat spot on the left. This is a good indicator and gives access to the switch without covering the indicator.

Acebeam L19 V2.0 flashlight indicator Acebeam L19 V2.0 flashlight on Acebeam L19 V2.0 flashlight on

LED Color Report (CRI and CCT)

The CCT on this emitter ranges from cool to very cool – around 6600K to 7500K. That’s very cool for EDC purposes but common and expected in tactical usage. So this is acceptable. The CRI is fairly low too, at around 70.


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)

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

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


What I like

  • Great beam profile
  • Good user interface
  • Very good throw
  • The optional cell can be used as a powerbank
  • No pulse width modulation

What I don’t like

  • Cell charging is a little slow
  • Tactical ring makes removal from nylon pouch difficult
  • Light doesn’t seem close to total output specification (but does hit throw numbers, which seems more important to me.)


  • This content originally appeared at  Please visit there for the best experience!
  • For flashlight-related patches, stickers, and gear, head over to!
  • Use my referral link if you’re willing to help support making more reviews like this one!
  • Please support me on Patreon!  Feeding flashlights is expensive!  And funding Fun Fund Friday even more so.  I deeply appreciate your support!
Liked it? Take a second to support zeroair on Patreon!

Leave a Reply

%d bloggers like this: