Acebeam TK18 Samsung LED Flashlight Review

With a strong catalog of flashlights, Acebeam produces a quality product at a reasonable price. In this review, I’ll be talking about the Acebeam TK18. It was released in three different LED versions. This review is for the “cool white” Samsung LED version, which also happens to be the brightest.

Acebeam TK18

Complete Package

Acebeam TK18 package

In nice protective packaging, the TK18 is accompanied by;

  • a (USB rechargeable) 3100mAh protected 18650 battery
  • a standard USB charging cable
  • an accessory packet with a lanyard, 2 spare o-rings, and a spare switch cap
  • user manual
  • warranty card


  • Length; 4.1″
  • Weight (w/battery); 3.83 oz
  • Battery; 1-18650 (included) or 2-CR123
  • Beam Distance; 156 meters
  • Max Output; 3000 lumens
  • Impact Resistant; 1 meter
  • Waterproof; 2 meters


The Samsung LED’s

  • (3) Samsung LH351D LED’s (cool white/reviewed model)
  • Two operating modes; Power & Eco (Eco is the default)
  • Mode Memory
  • Direct access to ultra-low, turbo, and strobe
  • Aerospace Grade aluminum body w/a TypeIII anodized finish
  • Low Battery warning
  • Electronic Lock-out
  • Highly efficient Constant Current circuit

Modes, Output, and Runtime

The output and runtime vary for each different LED type. The other versions offer either three Osram LED’s or three Nichia 219C LED’s, which will produce a much “warmer” beam tint. For this review, the info below is for the Samsung LED’s as noted.

Power Mode

Stats for alternate versions (“open” for full size image)

  • Turbo; 3000 lumens (60 minutes)
  • High; 1000 lumens (90 minutes)
  • Medium; 200 lumens (7 hours)
  • Low; 80 lumens (22 hours)
  • Ultra-low; 3 lumens (12 days)
  • Strobe; 1100 lumens

Eco Mode 

  • Turbo; 1450 lumens (90 mins)
  • High; 630 lumens (100 mins)
  • Medium; 200 lumens (6 hrs)
  • Low; 80 lumens (17? hrs)
  • Ultra-low; 3 lumens (9? days)
  • Strobe; 1100 lumens

Operating the Acebeam TK18

The rear switch is textured and has an audible click. It’s a simple click on/click off. Naturally pressing and holding changes the modes.

Low, medium and high is the sequence.

Ultra-low can only be activated from a holding press while “off”. While on or off, you can get Turbo from a double-click, and Strobe from a triple-click. A double-click from Turbo, returns it to the last mode used. A single click turns it off. A double-click from Strobe, activates Turbo.

Tailcap off

Head off

Tail switch






Switching Operating Mode/Lock-Out

As mentioned earlier, there are two operating modes, Power and Eco. There’s also a lock-out feature to prevent unexpected activation. Unfortunately, to change the mode, you need to lock it out first! Say what?

Since the manual is a tad unclear, I’ll try to explain this so it makes sense.

By default, the TK18 is set at Eco. To switch it to Power mode, start with the light off. Now, activate the “lock-out” function by pressing and holding the switch for five seconds. It’ll switch on in ultra-low, then blink three times. It’s now locked. With it off…click the switch rapidly TEN TIMES. It should respond with a low/high flash. It should now be in Power mode. The problem is if it didn’t switch it, you might not realize it…unless you have a photographic memory to recall how bright Turbo was before you shut it off!

If you’ve forgotten by this point, activating lock-out is as easy as keeping the switch pressed for five seconds and waiting for the blinks.

Beam Gallery

Acebeam TK18 on ultra-low


On low

Acebeam TK18 on medium

On medium

Acebeam TK18 on high

On high


Medium @50ft

Acebeam TK18 on high


Acebeam TK18 on turbo



Acebeam TK18 on high


Acebeam TK18 on turbo


Acebeam TK18 on turbo


















USB Charging 

Please note it’s the Acebeam battery that has the USB port. So to charge it without putting it in an external charger, remove it from the light and connect the standard cable to it that it comes with. You’ll notice there’s a tiny light on the positive end of the battery. It’s green as long as the battery has a decent charge. When the cable is connected it’s RED, and will turn green when finished.

Charging battery

Acebeam TK18 Closing Arguments

There are several reasons why I’m recommending the Acebeam TK18.

For one, it’s a great size for the pocket.

Even though I’m not usually a “rear-switch kind of guy” the button is nice. It’s not tactical, so it doesn’t require the pressure that tac switches usually need.

What I wish it DID have is a battery voltage indicator. By that I mean when you press the switch in such a way that it blinks out the voltage. The only indication it gives to a low battery is when you switch it on, and it blinks three times. And you won’t get much or anything from Turbo either.

Recommended battery is the high discharge 18650 it comes with. If you use a different one from time to time, it should be at least 20A, to ensure reliable Turbo output. Alternate battery source is two CR123’s. You CAN also use two 16340 rechargeable cells….but, it effectively looses ultra-low mode. It’ll work on it, but it’s just as bright as “low”.

One last thing. I guess it’s okay that it gives the option of lower output with Eco mode. BUT, going through the hassle of switching it, is almost not worth it. I’m leaving mine on Pro. So I would suggest picking a mode, and sticking with it!

The PRIME Choice!

So do you want an Acebeam TK18 or what?

Amazon Prime will surely spring into action if you click this link and then click to buy!

Thanks for reading the review, and please let me know if you have any questions or comments 🙂 



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