Acebeam Terminator M2


Brand/model Acebeam M2
LED Floodlight (3*Cool White 6500K), Spotlight (1*LED)
Maximum lumens 3,200 lm
Maximum beam intensity 62,500 cd
Maximum throw 500 m
Battery 1*18650
Onboard charging No (USB-C battery)
Material Aluminium
Modes 6
Blinkies Strobe, SOS
Reflector Floodlight (TIR), Spotlight (lens)
Waterproof IP68
Review date January 2024


The Acebeam Terminator M2 has a lot going on! It has a floodlight, a spotlight and an RGB AUX Light with seven colours. This EDC torch is powered by a single 18650 cell. And it is controlled by two switches.

Here is my video review of the Acebeam M2:

Acebeam kindly sent this torch for review. I have not been paid for this review nor have I held back my opinions of this torch.


The Acebeam M2 comes in a shiny blue and orange box with a window to see the torch.

Acebeam M2 packaging Acebeam M2 packaging

Acebeam M2 packaging Acebeam M2 packaging

The following was included in the box:

  • Acebeam M2
  • Acebeam ARC18650H-310A 3100mAh battery
  • USB-A to USB-C cable
  • Two spare o-rings
  • Lanyard
  • User manual

Acebeam M2 packaging Acebeam M2 accessories

Acebeam M2 user manual-1 Acebeam M2 user manual-2

Acebeam M2 warranty

Torch in use

The Acebeam M2 feels compact in my hand.

Acebeam M2 in-use-1 Acebeam M2 in-use-2

I like the symmetry of the floodlight and the spotlight.

Acebeam M2 in-use-3

I find myself changing from using an underhand grip, while carrying the torch, to a cigar grip while switching between the floodlight and the spotlight.

Acebeam M2 in-use-4 Acebeam M2 in-use-5

The tail button can be pressed to turn the torch on and off, and to change the brightness.

The side switch can be pushed or pulled to change between the floodlight and the spotlight.

I love being able to switch between the two! I can be walking along with a floodlight to see where I am going and then switch to a spotlight to check some noise that I hear in the distance (e.g. a kangaroo).

Here is an example of using the Acebeam M2 while lost in a park with Darren after comparing a bunch of powerful flooders and throwers.

Note: The thumbnail of that video is of a NEXTORCH T20L. Darren posted a full video of our adventure to the Maroondah Reservoir Park.

The torch can tailstand and there is a lanyard hole built into the torch.

The torch fits comfortably in my pocket.

Build quality

The Acebeam M2 has a matte green anodised finished. It is also available in black. There are no sharp edges.

There is plenty of grip. That said, I have dropped the Acebeam M2 a dozen times while leaning over with it in my shirt pocket.

Acebeam M2 front Acebeam M2 back

The side switch clicks smoothly into place to switch between Floodlight and Spotlight.

There is a battery status indicator on the side of the torch. It displays green or red when the torch is on.

Acebeam M2 side-1 Acebeam M2 side-2

The tail button gives a satisfying click for an electronic switch. The button cover and bezel remind me of the Acebeam E70 Mini.

Acebeam M2 closeup-tail

The pocket clip is ok. It is a bit stiff and does not have a deep carry design.

Acebeam M2 closeup-pocket-clip

The threads have been anodised so the tailcap can be unscrewed slightly to disconnect the battery.

Acebeam M2 threads

Springs at both ends allow short unprotected flat top 18650 cells to work.

Acebeam M2 spring Acebeam M2 driver

A lot of laser etching has been used.

  • Terminator M2
  • Floodlight and Spotlight symbols near the emitters.
  • Hot warning near the emitters.
  • “Floodlight” and “Spotlight” near the side switch.
  • Battery orientation symbol near the tail cap to assist with inserting a cell correctly.
  • and a battery symbol near the battery status indicator.
  • QR code and a serial number on the side.
  • Arrow and CE symbol on the tailcap.

There is also a lot of text near the side switch:

The flashlight may become
hot after extended periods
of use at the highest
setting. This is typical for
high powered flashlights.
Using a quality 18650
battery with circuit
protection (> 10 Amps) is
Turbo: Double click the tail switch.

Reverse polarity protection appears to work. I checked RPP with a digital multimeter at first to see if the battery would be shorted. I then inserted an unprotected 18650 cell in backwards and the driver did not burn nor did the battery explode (don’t try this at home).

LED, bezel, lens, reflector and beam

The green Acebeam M2 has three cool white 6500K emitters for the floodlight while the black Acebeam M2 has three neutral white (Nichia 519A 5000K 90 CRI) emitters for the floodlight.

The floodlight emitters are behind a triple TIR optic.

There appears to be a glass lens with a blue anti-reflective coating in front of the TIR optic.

Acebeam M2 closeup emitters

The spotlight has a throwy emitter behind a big lens.

Acebeam M2 closeup lens

The bezel gives a tactical look but it is not sharp.

Acebeam M2 closeup bezel

The seven colours for the AUX Light is as follows: red, yellow, green, light blue, dark blue, purple and white.

Acebeam M2 closeup lens Acebeam M2 closeup lens
Acebeam M2 closeup lens Acebeam M2 closeup lens
Acebeam M2 closeup lens Acebeam M2 closeup lens
Acebeam M2 closeup lens

While wandering around Maroondah Reservoir Park, Darren and I compared the Neutral White and Cool White versions of the Acebeam M2:

I noticed that the spotlight on the black Acebeam M2 looked more intense at a distance of ten metres compared to the green Acebeam M2. This was a surprise. I expected them to be the same. Perhaps there is some variation with the emitter used for the spotlight.

I also noticed that the green Acebeam M2 takes almost a second to reach the maximum brightness while using Turbo (Floodlight) or Both (High). It looked almost instantaneous with the black Acebeam M2.

When Acebeam reached out, I asked for the cool white version to see if it would reach 3,200 lumens and be brighter overall. But, anecdotally, the black Acebeam M2 appears to have a more intense spotlight and the beam produced by the floodlight looks prettier (in my opinion).

CCT, CRI, and duv

I have taken Correlated Colour Temperature (CCT) and Colour Rendering Index (CRI, RA of R1-R8) measurements with the torch positioned one metre away from an Opple Light Master Pro III (G3) for most modes. High (Spotlight) and High (Both) were measured at two metres. Moonlight (Floodlight) was measured at five centimetres.

The CCT is around 5500K for the floodlight and 6500K for the spotlight. The CRI is around 65 for the floodlight and 67 for the spotlight.

The Delta u, v is positive (green).

The beam produced by the floodlight has a big smooth hot spot. The triple TIR optic helps provide a bit of throw.

The beam produced by the spotlight is focused into a narrow hot spot. The hot spot looks like a ball of light on a wall one metre away. The centre is intense and it fades out toward the edge of the circle. There is a sharp yellow-green circle around the edge of the hot spot. A large dark donut pattern appears around the yellow-green circle.

The beam produced by both the spotlight and the floodlight looks like the beam produced by the spotlight but the dark donut pattern is filled with a floody white light.

LED Mode CCT (K) CRI (Ra) x y Duv
Floodlight Moonlight 5616 64.9 0.3295 0.3625 0.0119
Floodlight Low 5520 65.1 0.3320 0.3641 0.0116
Floodlight Med1 5507 65.4 0.3323 0.3636 0.0112
Floodlight Med2 5525 65.7 0.3318 0.3617 0.0105
Floodlight High 5592 66.2 0.3302 0.3581 0.0095
Floodlight Turbo 5730 67.4 0.3270 0.3509 0.0074
Spotlight Low 5801 62.8 0.3248 0.3630 0.0142
Spotlight High 6511 67.1 0.3118 0.3348 0.0066
Both High 6222 66.5 0.3167 0.3417 0.0076

Calculate Duv from CIE 1931 xy coordinates

Dimensions and size comparison


I took the following measurements using a digital caliper.

Measurement Unit (mm)
Length 97.3
Width 49.25
Height 24.69
Height with clip 29.69
Button diameter 13.45
Tube inside diameter 18.8
Battery diameter 18.7
Battery length 70.1


I took the following measurements using a digital scale.

Weight Unit (g)
Torch 146.59
Battery 52.56
Torch with battery 199.15

Size comparison with its competition

From left to right: Acebeam M2, Manker F14, Wuben X2 White, Wuben X2 Copper

Acebeam M2, Manker F14, Wuben X2 White, Wuben X2 Copper

From left to right: Acebeam M2, Manker F14, Wuben X2 White, Wuben X2 Copper

Acebeam M2, Manker F14, Wuben X2 White, Wuben X2 Copper

User interface

The Acebeam M2 has a tail switch and a magnetic control switch (side switch).

The floodlight has four main modes: Low, Med1, Med2 and High. There are also shortcuts to Moonlight and Turbo.

The spotlight has one mode: High (there is a secret Low mode).

Both the floodlight and spotlight can be turned on at the same time. It has one mode: High. There is also a Strobe mode.

The RGB Light has a Seven-Color automatic cycle and a second manual cycle group with five main modes: Red, Green, Blue, Green-Signal, Red-SOS.

Here is a quick demonstration of the user interface:

Side Switch State Action Result
Any Off Press and hold the tail switch for 3 seconds Lock
Any Locked Click the tail switch Battery level indicator flashes red and green
Floodlight Locked Press and hold the tail switch for 3 seconds Unlock and floodlight on (Moonlight)
Spotlight Locked Press and hold the tail switch for 3 seconds Unlock and spotlight on (Low)
Floodlight Off Press and hold the tail switch for 0.5 seconds Floodlight on (Moonlight)
Floodlight Off Click the tail switch Floodlight on (memory)
Floodlight On Press and hold the tail switch Cycle (Low, Med1, Med2, High)
Floodlight On, Off Double click the tail switch Floodlight (Turbo)
Floodlight Floodlight (Turbo) Double click the tail switch Floodlight (memory)
Floodlight On Move the side switch to Spotlight Floodlight off and spotlight on (High)
Spotlight On Move the side switch to Floodlight Floodlight on (memory) and spotlight off
Spotlight On Click the tail switch Off
Spotlight Off Click the tail switch Spotlight on (High)
Spotlight On Press and hold the tail switch Spotlight on (High)
Spotlight On Double click the tail switch Nothing
Any On, Off Triple click the tail switch Both (High)
Any On, Off Quadruple click the tail switch Both (Strobe)
Any Off Press and hold the tail switch for 1 second RGB Light on (Seven-Color)
Any Seven-Color, RGB Press and hold the tail switch Cycle (Red, Green, Blue, Green-Signal, Red-SOS)

Mode memory

Moonlight, Turbo, Strobe, Seven-Color, Red, Green, Blue, Green-Signal and Red-SOS are not memorised.

Low, Med1, Med2 and High are memorised for the floodlight.


Strobe appear to have a frequency of 10 Hz.

Both the floodlight and spotlight turn on during the Strobe mode.

Battery level indicator

The battery level indicator flashed red lights rapidly when the voltage was low.

The torch turns off when the voltage drops below 2.7V.

Colour Battery level
Green Level > 20%
Red 10% ≥ Level ≤ 20%
Red flash Level < 10%

Acebeam M2 closeup lens Acebeam M2 closeup lens

Low voltage protection

There is low voltage protection. The torch turns off around 2.67V and the battery status indicator displays red, followed by a flashing red light as the voltage drops.

I tested low voltage protection by connecting the head of the torch to a bench power supply and then by lowering the voltage from 4.2V to 0V for a 18650 Li-ion cell.

LED Mode LVP? Red light Red flash Cut-off
Floodlight Moonlight Yes 3.19V 2.88V 2.71V
Floodlight Low Yes 3.19V 2.88V 2.70V
Floodlight Med1 Yes 3.21V 2.87V 2.69V
Floodlight Med2 Yes 3.27V 2.96V 2.68V
Floodlight High Yes 3.41V 3.12V 2.69V
Floodlight Turbo ?
Spotlight High Yes 3.41V 2.95V 2.68V
Spotlight Low Yes 3.17V 2.86V 2.67V
Both High ?

Here is a video showing how I checked low voltage protection:

I have not checked low voltage protection while using Turbo (Floodlight) or High (Both) because my bench power supply has a limit of 5A and those modes require a higher current.


I did not notice any visible PWM (flickering).

What I like about the UI

  • It is easy to switch between the floodlight and spotlight.
  • Shortcut to Moonlight from off.
  • Shortcut to Turbo from off.
  • Shortcut to Both (High) from off.
  • Shortcut to Both (Strobe) from off.

What could be improved

  • I would love to see the Spotlight have multiple levels like the Floodlight instead of just High. There is a hidden Low mode for the Spotlight after unlocking the torch, so it is possible.
  • SOS should use a white light instead of a red AUX Light. It is difficult to see red in an emergency.

Batteries and charging


The included Acebeam ARC18650H-310A 3100mAh 3.6V Li-ion with built-in USB-C charging and protection arrived with a voltage of 3.86V.

Acebeam M2 battery-1 Acebeam M2 battery-2

A piece of insulating film was included to prevent the torch from being turned on while in the packaging.

Acebeam M2 insulating-film

I tried the following cells:

Cell Top Compatible? Comment
Acebeam ARC18650H-310A 3100mAh USB-C 23-A4 White Button Yes
Acebeam ARC18650H-310A 3100mAh USB-C 22-J6 Black Button Yes
Samsung 30Q 18650 3.7V Li-ion 3000mAh Flat Yes
Panasonic NCR18650GA 3.7V Li-ion 3450mAh Flat Yes
Protected 18650 3.7V Li-ion 2600mAh Button Yes


Power supply: PinePower Desktop USB-C
USB Meter: AVHzY CT-3
Room temperature: 20 C

Acebeam M2 charging profile

I charged the included battery from 2.85V to 4.15V using the battery’s USB-C port. It took about 2 hours 13 minutes to fully charge.

The charging rate started at around 5V 0.8A. It increased to 5V 1.4A before dropping off.

The indicator LED went red while charging and it went green when charging was complete.

There appears to be enough space on the Acebeam M2 to add built-in charging. It would be nice if any 18650 cell could be charged inside the torch instead of having to take the cell out. This is a personal preference. The anodising may eventually wear away from the threads and slightly unscrewing the tailcap to disconnect the cell as a way of locking out the torch may stop working.

Power supply compatibility

I tried the following power supplies with the built-in USB-C charger:

Power supply USB Type Protocol Does it charge?
Apple 61W Power Adapter USB-C PD Yes
Google Pixel Power Adapter USB-C PD Yes
PinePower Desktop USB-C PD Yes
PinePower Desktop USB-A QC Yes
PinePower Desktop USB-A Yes

USB-C to USB-C charging works.


Specifications from the user manual:


FL1 STANDARD Turbo High Med2 Med1 Low Moonlight
Output (lumens) 3,200 + 1,200 + 50 1,200 + 50 500 + 50 200 + 50 50 1
Runtime 1min 50s + 1h 10min + 25min 1h 15min + 25min 3h + 25min 7h + 25min 18h 30min 38h
Beam Distance (metres) 178 119 79 54
Beam Intensity (cd) 7,921 3,540 1,560 729


Output (lumens) 900 + 400
Runtime 50s + 1h 50min
Beam Distance (metres) 500
Beam Intensity (cd) 62,500

Both (Floodlight + Spotlight)

FL1 STANDARD High Strobe
Output (lumens) 2,700 + 1,000 1,900
Runtime 50s + 1h 15min 1h 30min
Beam Distance (metres) 440 350
Beam Intensity (cd) 48,000 30,625

AUX Light

FL1 STANDARD Seven-Color Red Green Blue Green-Signal Red-SOS
Output (lumens) 0.5 0.5 0.5 0.5 0.5 0.5
Runtime 300h 383h 437h 491h 1194h 1042h

Lumen measurements

Note: Lumen measurements may be off by 10% with my DIY lumen tube. Output measured from TIR optics may be lower than normal with my lumen tube.

I used a bench power supply to measure the current at turn on.

LED Mode Amps at start Specs Lumens @turn on Lumens @30 sec Lumens @10 min
Floodlight Moonlight 0.06 A 1
Floodlight Low 0.13 A 50 48 48 48
Floodlight Med1 0.35 A 200 + 50 199 196 192
Floodlight Med2 0.79 A 500 + 50 478 466 457
Floodlight High 2.15 A 1,200 + 50 1,146 1,112 1,052
Floodlight Turbo 5A+ 3,200 + 1,200 + 50 2,099 2,867 1,061
Spotlight High 4.93 A 900 + 400 820 773 342
Spotlight Low 0.04 A 17 17 17
Both High 5A+ 2,700 + 1,000 2,000 2,954 806

Both (High) ramped up to 3,183 lumens within the first second.

Floodlight (Turbo) ramped up to 3,193 lumens within the first second.

The lumen output is pretty close to what Acebeam claimed.

Standby drain

72.6 µA

Runtime graphs

I used my own DIY lumen tube with a TSL2591 sensor and forked bmengineer’s project RuTiTe to record runtimes.

The room temperature was approximately 22 C.

Acebeam M2 runtime graph

Acebeam M2 first 2 hours runtime graph

Acebeam M2 first 10 minutes runtime graph


Here is a summary of the runtime results:

LED Mode User manual Runtime Turn off Final voltage
Both High 50s + 1h 15min 1h 17min 53s 1h 26min 14s 2.91V
Spotlight High 50s + 1h 50min 2h 2min 47s 2h 4min 51s 2.85V
Floodlight Turbo 1min 50s + 1h 10min + 25min 1h 13min 0s 1h 37min 22s 2.79V
Floodlight High 1h 15min + 25min 1h 25min 18s 1h 46min 41s 2.86V
Floodlight Med2 3h + 25min 3h 19min 41s 3h 41min 47s 2.90V
Floodlight Med1 7h + 25min 7h 40min 17s 7h 40min 17s 2.88V
Floodlight Low 18h 30min 19h 20min 16s 19h 20min 16s 2.78V
Floodlight Moonlight 38h 10min+ 10min+

“Runtime” is the time until the output reduces to 10% of the output at 30 seconds (as per the ANSI/PLATO FL1 2019 Standard).

“Turn off” is the time until my DIY lumen tube no longer detects more than one lumen.

“+” indicates that the light remained on after recording had stopped.

The runtime results are slightly better than expected.

I really like the stable output!


I took lux measurements with a UNI-T UT383BT at 30 seconds. Moonlight and Low for the floodlight were measured at one metre. Other modes were measured at five metres.

LED Mode Specs (cd) Specs (m) Candela measured (cd) Distance (m)
Floodlight Moonlight
Floodlight Low 112 21
Floodlight Med1 729 54 400 40
Floodlight Med2 1,560 79 1,150 67
Floodlight High 3,540 119 2,875 107
Floodlight Turbo 7,921 178 7,625 174
Both High 48,000 440 57,200 478
Spotlight Low 1,350 73
Spotlight High 62,500 500 64,750 508

Moonlight was too low to detect at one metre.

The beam distance is similar to what Acebeam claimed.


I went to a local park and aimed the Acebeam M2 at a tree 70 metres away.

Beamshots were taken using a Sony RX100M2 using 3.2", f3.2, ISO 100, 5000K WB.

Acebeam M2 Spotlight (High)

Acebeam M2 Spotlight High beamshot

Acebeam M2 Floodlight (Turbo)

Acebeam M2 Floodlight Turbo beamshot

Acebeam M2 Both (High)

Acebeam M2 Both High beamshot

Manker F14 Spotlight (Turbo)

Manker F14 Spotlight Turbo beamshot

Manker F14 Floodlight (Turbo)

Manker F14 Floodlight Turbo beamshot

Manker F14 Both (Turbo)

Manker F14 Both Turbo beamshot

Wuben X2 White (Turbo)

Wuben X2 White Turbo beamshot

Wuben X2 Copper (Turbo)

Wuben X2 Copper Turbo beamshot

Here is a video demonstrating the Acebeam M2:


The Acebeam M2 is a pretty solid dual beam EDC torch. It has an excellent build quality.

I personally prefer to carry smaller AAA and AA sized torches for my every day carry.

The M2 is something that I would put in my jacket pocket and then pull out when walking around a park at night. It is great for spotting wildlife!

The user interface is relatively simple to use. The side switch definitely makes it easier to switch between the floodlight and the spotlight.

I do wish that the spotlight had more than a High mode. There is a hidden Low mode but it would be even better if it had Low, Med1, Med2 and High like the floodlight.

I would highly recommend the black Acebeam M2 if you are looking for something with a warmer beam and a higher CRI. This green Acebeam M2 is great if you prefer a cool white floodlight at night.


  • Excellent build quality.
  • The hotspot of the spotlight is big and practical.
  • Good beam distance.
  • Good runtimes.
  • Light output is well regulated.
  • Low voltage warning.
  • Low voltage protection.


  • Spotlight has one mode: High (and a secret Low mode). It’d be better with more modes.
  • Red SOS.
  • Low CRI (there is a high CRI version).
  • Pocket clip isn’t deep carry.


The Acebeam Terminator M2 is about AU$200 from (affiliate link)

If you are going to carry the M2 in your jacket, then you might as well consider getting the slightly larger and much more powerful Acebeam M1. The M1 has a zoomable LEP and a larger 21700 cell.

Product page

Promo code: SG9IP8YKT5PI

Acebeam M2 at (affiliate link)
Acebeam M1 at (affiliate link)

I may earn a commission if you use an affiliate link or a promo code. This will help fund future torch reviews and tutorials.