Acebeam T35

1lumen selects and reviews products personally. We may earn affiliate commissions through our links, which help support our testing.

Acebeam T35 review

Acebeam T35 specifications

Brand/modelAcebeam T35
Flashlight categoryTactical flashlight
LED1*Luminus SFT40
Max. output1,600 lumens
Max. beam distance352 meters
Max. beam intensity30,976 cd
Battery config.1*18650
Onboard chargingUSB-C
Modes5
BlinkiesStrobe
WaterproofIP68
Review dateMay 2024

Review intro:

This particular flashlight was gifted and didn’t need to be reviewed. However, since I got my hands on it, I’d rather review it anyway….

This is the T35, a tactical-style flashlight with ‘only’ 1,600 lumens. That’s because this is the NW (neutral white) version, but you can get 1,900 lumens with the CW (cold white) version.

And since Acebeam has been around for quite some time, and built lots of different kinds of flashlights.. it should be at least good enough for some users.. but is it truly Tactical?

Let’s find out?

What’s in the package

The packaging for the T35 is relatively simple, and something you would expect hanging (or standing) on some shelved in a brick and mortar store. And this is what you find inside:

  • Acebeam T35
  • 18650 battery (ARC18650H-260A , 2600mAh)
  • USB-C charging cable
  • Lanyard
  • 2 O-rings
  • Spare USB port cover
  • Holster
  • Warranty card, and manual

Do this before your first use: remove the sticker on the glass lens, and remove the plastic insulator from inside the tailcap.

Flashlight in use, Build Quality, and Warranty

There is one thing that most Acebeam flashlights have in common: good build quality. And the T35 is no exception to that rule. Mine has some good looking (brown) anodization, with plenty of knurling on the battery tube and tailcap. The anodization is done pretty well, but if you look super super closely, you’ll notice just a very tiny difference in coating between the tailcap and battery tube. But it’s so tiny, most people wouldn’t even notice. And frankly, it’s so tiny, that I don’t care about it.

No build quality problems anywhere on the light.

There are 2 switches on the T35, an electronic switch on the side, and a protruding mechanical forward-clicky switch on the rear. A forward clicky switch activates the light while half-pressing, before the actual click. But the UI is built that it’s just for power, and not mode switching. Because of this, you can use the rear switch for morse coding in any mode. The side switch is the one that controls the UI.

Therefore, you can use the flashlight in the overhand, as well as underhand grip. In the overhand grip, you can rest your thumb on the rear switch. It’s easy to manipulate with the flat part of your thumb, unlike some other switches that can only be manipulated by the tip of your thumb/finger.

There is no way to tailstand the T35 because of the protruding switch.

If you’re looking for a flashlight that you want to pocket carry in your jeans, it may not be the right choice. First of all, because of the rear switch being activated quite easily (and possibly burn your pants if in Turbo mode), and the relatively sharp bezel. You can still carry it in larger pocket if you unscrew the tailcap slightly. This basically functions as a lockout.

Acebeam includes a holster for obvious reasons, but they also include a lanyard.

This all makes it geared towards tactical use, so guard work, first responders, etc. But for those reasons I would have like a shortcut to Turbo, even though, you can leave the flashlight in Turbo modes at all time.

What I also like is the side switch being illuminated at all times when the flashlight is activated. When I was out doing beamshots, it was very easy to find the switch. Sometimes when the flashlight is on, and I change hand position, I’m almost blinding myself to find the side switch.

Warranty? Yeah, Acebeam has you covered! The details are:

  1. If the customer experiences any problems caused by manufacturing defects in normal use with an Acebeam product within 15 days of purchase, the dealer will replace that product.
  2. If an Acebeam flashlight fails during normal use and any problem covered under warranty occurs within a period of 5 YEARS (60 months) of purchase, the dealer is responsible for warranty service.
  3. Acebeam flashlights enjoy a limited lifetime warranty – after 60 months the dealer will attempt to repair the flashlight for the cost of spare parts and shipping (i.e. no charge for labour).

LED, Lens, Bezel, Beam, and Reflector

I had briefly mentioned that mine has a claimed output 1,600 lumens, and that’s because of the LED they used. Mine has a Luminus SFT40 LED but with a neutral white color temperature. If you choose the cold white version, it is claimed to reach 1,900 lumens.

Note: this does not mean that NW is always weaker than CW in the same flashlight. I have several flashlights with both types of emitters where the NW is brighter (but not in all instances).

The Luminus SFT40 has no silicone dome like a regular LED would have. Instead, there is a flat silicone layer, which implies that the beam will shine farther than one with a domed silicon layer.

And that’s why the T35 is claiming a beam distance of 352 meters or 30976 candelas.

The LED sits very well centered in a smooth reflector, protected by a glass lens, and sharp bezel. The glass lens is touted as: Utilizes scratch-resistant coated optical lens with a light transmittance rate of up to 99%.

Spectral measurements:  

I used a Sekonic C800 spectrometer to measure the flashlight at 5 meters distance. These were measured short after turn on.

Mode:CCT:CRI Ra:duvTM30 RfTM30 Rg
Turbo5776K68.7-0.00466795
Med4877K68.60.00096993

The higher the output the cooler the beam becomes.

Dimensions and its competition

Dimensions: 

Acebeam T35MillimetersInches
Length138 mm5.4 in
Bezel diameter26 mm1.0 in
Body diameter23 mm0.9 in
Tailcap diameter25 mm0.98 in

Dimensions are rounded to the nearest millimeter and the nearest tenth of an Inch.

Weight

Acebeam T35Weight in gramsWeight in oz.
Without battery:91 g3.2 oz
With battery138 g4.9 oz

Weight is rounded to the nearest gram and tenth of an Oz.

Acebeam T35 tactical flashlight comparison

Size compared to other tactical flashlights

Group 1, from left to right: Armytek Predator Pro, NEXTORCH E52C, Fenix PD36R, Acebeam T35, Weltool T2R, NEXTORCH TA20

Acebeam T35 UI : User interface and driver

The Acebeam T35 has 2 switches, with 2 unique features. The rear switch is only used for On and off, while the second switch (side switch) is used to change modes. The rear switch is a forward clicky switch, so you have a momentary mode, which can be used for signaling etc.

The available main modes:

  • Ultra Low, Low, Medium, High, Turbo

The available special modes (blinkies):

  • Strobe

How the UI works when the flashlight is still turned OFF:

  • Half-press rear switch: momentary use of current mode
  • Single-click rear switch: turns the flashlight on
  • Single-click side switch: doesn’t do anything, without powering on first with rear switch

How the UI works when the flashlight is turned ON:

  • Single-click rear switch: turns the light off
  • Single-click side switch: changing modes
  • 2+clicks: just changed modes in sequence
  • Press and hold side switch: strobe

Shortcuts within the UI:

  • To Turbo: none
  • To Moon: none
  • To Strobe: long-press side switch when on

Mode memory:

  • Yes, it will always turn on in last used mode (which makes momentary on easy to understand)

Blinky modes:

  • Strobe.. accessible by a long-press of side switch

Low battery warning:

  • Side switch has battery indicator LED. It will show the battery level with 2 colors
  • Green: 20-100%
  • Red solid: 10-20%
  • Red blinking: 0-10%

Lock-out mode:

  • Not.. but the rear switch is like a lockout mode.. it’s a mechanical switch
  • For pocket carry, I’d recommend unscrewing the tailcap, which functions like a lockout

PWM:

  • Not visible in person

Firmware / UI Conclusion:

  • Having no access to Turbo is a pity. It would be nice, because when outside, it’s sometimes hard to know whether you are in High or Turbo. And by clicking another time, you might go back to Ultra Low.. instead of Turbo you might expect.
  • On the other hand, it’s a very easy UI that everybody can work out without a manual. No hidden modes (except Strobe).
  • Ultra Low being part of the normal mode cycle may not be the best choice. When you go from over 1000 lumens to 1.. the difference is just too big. I wouldn’t mind if they got rid of Ultra Low mode, at least in the normal modes cycle.

Acebeam T35 Charging and batteries

Acebeam provides a 2600mAh, 18650 battery with the T35, and it’s labeled: ARC18650H-260A. It’s a button top cell, with protection.

It’s a little interesting to see a 2600mAh in this day and age. Most 18650 batteries are north of 3,000mAh when thy are provided by the manufacturer. It does look like a high discharge battery, as it is labeled as 15A, which is a medium to high discharge current. But again, not very groundbreaking. But it’s better than nothing.

Upon arrival, the battery was 3.82V, and protected by a plastic insulator. You have to remove that first before your first use.

Even though there are springs on both ends of the flashlight, unprotected flat top batteries are too short to make contact. You basically need at least a button top, and even better, a protected battery (that doesn’t trip too easily).

Charging can be done onboard, via the USB-C port, hidden on the opposite side of the side switch, covered by a black rubber cover. And interestingly enough, this rubber cover can be removed and replaced by a small Philips screw.

During charging, a red light is visible, which turns green when it is finished. What I don’t really understand is the charging time. According to the manual, it is approximately 3 hours. But in reality I got different charge times.. 1 of them without a USB meter, but the others were all including the USB meter, so I can watch the charge current etc. I used 2 separate USB chargers, but both should be able to charge at 2A with ease.

Something else that was interesting, is that the charging current jumps to 1.5Amps instantly, even when the battery is below 3V. Other, more sophisticated chargers (different from onboard charging I guess) start at a lower rate, until it reaches 3Volts, at which point the charge current increases to max. The highest current I saw was 1.6A, but it was only for a short time. The charger reduces the charge current slowly over time.

  1. First charge: 2h 55min
  2. Second charge: 4h 23min (without using a USB meter)
  3. Third charge: 3h 19min
  4. Fourth charge: 3h 30min

I couldn’t test the end voltage after each charge, because I’m busy doing other stuff, not noticing the end of a charge. But the times that I measured the end voltage, they ranged from 4.18V and 4.22V. I know that the Voltage drops rather soon after a charge has finished, so the 4.18 was likely measured some time after the charge stopped. While the 4.22V was measured very soon after the indicator LED turned green.

I’ll share a quick tip on how I know how long a charge takes, and it’s rather unorthodox. I have an IP camera, recording the charges, pointing at the USB meter, so I can easily see when a charge finished, what the maximum charge current was etc.

Charge typeFitsNo fitAvg. charge time
Flashlight with onboard USB-CLong 18650 batteriesFlat top, non-protected 186503h 20min?

Performance test

This is the gear I use for testing:

GearPurposeLink to buy
Hagner E4-XMeasuring beam intensity (throw)Inquire at Hagner.se
2* Extech SDL400Lumens and logging runtimesAmazon.com, Amazon.co.uk,
Leica Disto D2Distance for throw measurementsAmazon.com, Amazon.co.uk,
Sekonic C-800 Spectrometer for LED measurementsAmazon.com, Amazon.co.uk
Uni-T UTi260BThermal Image cameraAmazon.com,

Lumen measurements:

How Lumens are Measured: Understanding ANSI FL1 Standards How Lumens are Measured: Understanding ANSI FL1 Standards: The ANSI FL1 standards specify that output in lumens should be measured 30 seconds after turning on, as this is the standardized time for measuring brightness according to the industry standard. This is why we focus on this part in our measurements. The ANSI FL1 standards require an ambient temperature of 22 ± 3°C. We record the ambient the ambient temperature to identify potential reasons for any observed discrepancies.

The output measurements in this review are based on my homemade integrating spheres, each equipped with an Extech SDL400 Lux Meter. For consistency and accuracy, a calibration light (Convoy S2+ with 249lm and a Convoy S2+ with 261lm) is measured before each set of lumen measurements.
One of the lux meters uses an ND camera filter for high-output lights to prevent the lux meter from maxing out. This is either the Kenko PRO1D ND16 for up to about 80,000 lumens or the Gobe ND32 for anything above.

All of my readings were taken from a fully-charged Acebeam ARC18650H-260A , 2600mAh.

ModeSpecifiedTurn on30 sec10 min
Ultra Low3 lm3 lm3 lm
Low90 lm83 lm83 lm83 lm
Mid350 lm317 lm316 lm312 lm
High700 lm693 lm686 lm657 lm
Turbo1600 lm1555 lm1427 lm632 lm

The measurements were taken manually at turn on and 30 seconds. The 10-minute numbers are taken from the runtime graph. You can see that I couldn’t reach the specified output for 4 out of the 5 modes.

I try to use rounded lumen numbers, except for maybe Low or Moonlight/Firefly modes.

Ambient temperature during testing:

  • 21.8°C

Parasitic drain:

  • Shouldn’t have any.. the mechanical switch helps to get no parasitic drain

Acebeam T35 Battery life and runtime

How Runtimes are Measured: Understanding ANSI FL1 Standards About ANSI FL1 runtime standards: The runtime is measured until the light drops to 10% of its initial output (30 seconds after turning on). This does not mean that the flashlight is not usable anymore. The last column shows how long the light actually works till it shuts off. If there is a + symbol, it means that the test was stopped at that particular point, but the light was actually still running. This happens on certain occasions, with certain drivers, firmware, or batteries.

Runtime tests were conducted in my 50cm homemade integrating sphere, paired with the Extech SDL400 data logging Lux Meter. Temperatures from the moment the runtime test started.

ModeSpecifiedRuntime (ANSI FL1)Time till shut off
Ultra Low400h
Low (24.1°C)16h18h 37min18h 37min
Med (24.9°C)3h 50min4h 36min4h 36min
High (23.5°C)1h 35min1h 51min1h 52min
Turbo (21.5C)1h 31min1h 33min1h 46min

I didn’t test Ultra low, which was specified at being 400hours.

Turbo and High were pretty close to specified, but Medium ran quite a bit longer, as well as Low. I didn’t test Ultra Low though. I checked the discharge current in Ultra Low, and it was about 4.5mA according to 2 of my DMMs. So if I do 2600mAh divided by 4.5mA = 578 hours. I double checked the Low current as well, which was 141mA, and 2600 divided by 141 = 18.44, so close to the 18h 37min I measured. So it’s fair to assume that 400h is on the conservative side.

Tactical light comparison

Some of the best Tactical Flashlights we reviewed: These numbers are NOT from the specifications but are measured by our team. I removed the LEP flashlights that could fall into this category but aren’t comparable.

FlashlightMax. Output (lm)@30sec (lm)Candela (cd)Distance (m)
Acebeam T351555142725,250318
Armytek Dobermann Pro1071106831,606356
Armytek Predator Pro1206119340,850404
Armytek Viking Pro1999195829,069341
Brinyte PT18 pro1981192545,675427
Brinyte PT281705163617,800267
Cyansky P201740166514,405295
Fenix TK11 Tac1556148827,600332
Malkoff MDC Bodyguard8722112,650113
Nitecore P20 v289389313,900236
Olight S2R Baton 2131812897,500173
Olight Warrior Mini 21721165812,250221
Olight Warrior Mini 31724164314,075237
Powertac E5R-G41718160221,700295
Speras EST MAX240055517,250263
Streamlight Stinger 20202183214125,450319
Thrunite BSS v42336219014,775243
Weltool T1220001846 126,500711
Weltool T2R1589148641,750409
Wuben E12R1426120010,575206

Here’s an interactive comparison graph with some of the best 18650 tactical flashlights I reviewed.

Mobile phone? Hold your phone horizontally for a full graph. If still not clear, click this link to open the interactive graph in a new window.

And here is the same comparison, but then focused on the first 10 minutes. (Max. output only). Or open this link for a closer look at the graph.

Acebeam T35 Peak beam intensity and beam distance measurements

About Peak beam intensity: Understanding ANSI FL1 Standards About peak beam intensity The calculated value of distance in meters at which the flashlight produces a light intensity of 0.25 lux. (0.25 lux is about the brightness of a full moon shining on an object). This means that the intensity has decreased so much, it becomes difficult to see darker objects, or objects that don’t reflect light. The columns ‘Meters’ and ‘Yards’ use rounded numbers.

Measurements were taken indoors with a Hagner E4-X Lux Meter. The measurements were taken 30 seconds after turn on.

ModeSpecifiedMeasured candelasMetersYards
Ultra Low
Low2,401 cd1,450 cd76 m83
Med6,400 cd5,675 cd151 m165
High13,225 cd12,400 cd223 m244
Turbo30,976 cd25,250 cd318 m348

I measured Ultra low at 1 lux.. which is rounded.. so I didn’t add it to the list

Unfortunately, the specified candelas were unable to be met by my measurements.

Ambient temperature during testing:

  • 23.9°C

Beamshots

For the following beamshots, I used a Canon EOS 5D Mk2 with a 50mm lens. Manual settings: ISO1600, 1/4sec, F4, 5000K

The shed is about 65 meters / 71 yards away, and the reflective fence is about 200 meters.

Explore and compare the beamshots from the following flashlights:

  • Acebeam T35
  • Armytek Predator Pro
  • Olight Warrior S3
  • Olight Warrior Mini 3

Please note that the following beamshots are mainly intended to showcase the beam pattern and beam quality, rather than overall performance. These images are typically taken directly after activation, and in different seasons or weather conditions, and therefore do not fully represent its overall performance. For accurate performance metrics, such as output, beam distance, and runtimes, you need to look at the performance section of this review.

Disclaimer: This flashlight was sent to us for review at no cost by Acebeam. We have not been paid to review, nor have we been holding back on problems or defects.

Final Verdict

Pros

  1. Nice build quality
  2. Easy to understand UI
  3. Simple 2-switch design: rear switch for power and momentary mode, side switch for UI
  4. Ready to go package: includes battery and onboard charging

Cons

  1. No shortcut/direct access to Turbo
  2. Ultra Low part of the normal mode cycle
  3. Battery indicator could have more ‘steps’ because the only change at 20% .
  4. Not reaching claimed output
  5. Low capacity battery included, at 2,600 mAh

Explanation on star ratings:

1: Avoid: my phone flashlight would be a better choice – 2: Poor: significant defect or issues; almost unusable – 3: Average: some defects or issues; but still usable 4: Good: recommended (minor issues) – 5: Great: highly recommended

Reviewer Marco
Author: Marco

4.5 stars: ★★★★⋆

While our star rating provides a reliable indicator, we encourage you to read the full review to make an informed decision based on your own needs and preferences.

The Acebeam T35 is a simple looking tactical style flashlight with a pretty standard user interface. Probably everyone who grabs a T35 will understand how the UI works within a matter of minutes (or seconds for flashoholics).

Nice build quality, onboard charging and a 18650 battery included. But that battery contains a rather low capacity, only 2,600mAh. Something I think they could improve is more levels in the battery level indicators. Instead of going from green to

The UI is simple, but I miss a direct access to Turbo. Sometimes I wasn’t sure if I was in High or Turbo, and with a half press was back to Ultra Low.. losing my visibility. Then I had to remember how many modes it had to stop at Turbo, and not accidentally activate Ultra Low again (so doing at least 2 full rounds). For EDC that’s probably okay, but for any critical situation, not so.

Buy your Acebeam T35 with a discount

Get a whopping 15% off your next order at Acebeam.com with the following discount coupon: AE15. Simply add the coupon code at your checkout.

1lumen selects and reviews products personally. We may earn affiliate commissions through our links, which help support our testing.