Wowtac makes some solid, inexpensive lights, and they’ve updated their A2 headlamp.  Wowtac has released the A2S, which almost doubles the output across all modes, increases throw, but retains the nice form factor of the headlamp.  Read on for full testing of the Wowtac A2S!

Official Specs and Features

Here’s a link to the official product page.


As mentioned, this is revision 2 of the A2.  So there’s the original, which is available in NW and CW.  And the A2S is also available in NW and CW (seen here).


The Wowtac A2S retails for $35.95 $29.99 on amazon (referral link).

Wowtac just emailed me with a coupon to add in, too:  10ZeroAirA2S.

They also have a program going:  “LEAVE AN HONEST REVIEW FOR A5 ON AMAZON, qualified to get one FREE A1 flashlight or one 20% one-time coupon, suit for all our item, contact to get in.  Their store:

Short Review

This is a solid, inexpensive 18650 headlamp.  It performs well, and meets its claims.  Also it includes the needed cell, and is available in NW.  I’d call it a good buy.

Long Review

The Big Table

Wowtac A2S
Emitter: Cree XP-L (V6)
Price in USD at publication time: $29.99 on amazon
Cell: 1×18650
Turbo Runtime High Runtime
LVP? Yes
Switch Type: E-Switch
Quiescent Current (A): 0.0001
On-Board Charging? Yes
Power off Charge Port with no Cell?
Claimed Lumens (lm) 1050
Measured Lumens (at 30s) 1180 (112.4% of claim)*
Claimed Throw (m) 182
Candela (Calculated) in cd (at 30s) 351lux @ 5.06m = 8987cd
Throw (Calculated) (m) 189.6 (104.2% of claim)*
All my Wowtac 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

  • Wowtac A2S Headlamp
  • Wowtac headband
  • Wowtac USB rechargeable 18650 cell
  • Charge cable (USB to micro-USB)
  • Spare o-ring
  • Manual

Package and Manual

Standard Wowtac package here.  Notice the “Technically Supported by Thrunite” – the box even is very much like Thrunite’s box.

Good manual.  Also note on the manual the warranty:  Wowtac provides 2 years maintenance service.

Build Quality and Disassembly

No complaints about build quality.  In particular I like most of the knurling.  The tailcap, which must be removed for cell changes, has plenty of knurling and is large enough for a good grip.

The knurling on the body is fine too, but probably mostly superfluous since as a headlamp the light won’t most often be gripped here.

And the knurling on the head is completely superfluous, because this part doesn’t even unscrew at all.  Well actually it does unscrew, but all it reveals is the electronic switch, so there’s no need to ever do this.  I’m very surprised there’s no threadlock here, actually.

The tailcap has a big spring, but no magnet.  Also note the threads on the body there – big beefy square cut threads, and not many of them.  Just around a turn and a half for removal.

The head has only a button for positive contact.

The cell tube is fully removable, and also reversible.  It works in either direction.  However, only one direction is sensible for headlamp use in the provided holder.

Size and Comps

Weight:  108g (Battery Excluded)
Dimension:  106mm30mm23.5mm

Retention and Carry

As this is a headlamp, there are no real other ways to carry it except the provided headstrap.  No pocket clip, no lanyard, no magnet, etc.  But the headstrap is good.

Above, you can see the correct cell tube orientation for use in the headstrap.  If you have the tube in the other direction, the head is cantilevered out too far and the balance is very wrong.

The headband is just stretchy material; there is no grippy part to hold it in place.

And the over-head part isn’t removable, either.

Quick note here… the button protrudes too much for headstanding.

Power and Runtime

Wowtac provides the necessary cell for running this light.  It’s a 3400mAh 18650, and has build in micro-USB charging.

Here’s a runtime on Turbo.  Output beats the claim by a fair margin in my test.  The light steps down after a short (but respectable) while, and then finally ends with a warning from the main emitter (two flashes).

High output is essentially the same as Turbo but just starts at 450 lumens instead of stepping down to 450.

Both tests exhibit the two flash warning of low voltage.  Bench power does indicate the light has LVP, too.

The included cell has built-in charging via a micro-USB port.  An appropriate cable is included.

Charging is at a very conservative 0.55A, and takes around 7 hours to complete.

Modes and Currents

Mode Mode Claimed Output (lm) Claimed Runtime Measured Lumens Tailcap Amps
Turbo 1050 2.7h 1180 2.85
High 420 4.5h 433 1.15
Medium 126 14.7h 148 0.30
Low 24 4d 26 0.08
Firefly 0.3 59d ~ 0.03

Pulse Width Modulation

Firefly and Turbo don’t have PWM, but the middle 3 modes do.  Note the timescale though – 50us.  That’s faster than I can notice by eye, so it’s likely to not be a concern for you either.

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’s a single switch for operating the A2S.  It’s a head e-switch.  The button is proud and has a bunch of grip.

The UI is fine but there’s a bit of a quirk.  Sometimes the light goes from Medium back to Low, instead of going on to High.

Here’s a UI table!

State Action Result
Off Click On (Mode Memory (except Firefly and Turbo and SOS)
Off Hold Firefly
Off Double Click Turbo (really On, then Turbo)
On Hold Mode cycle (LMH) (excludes Firefly and Turbo and SOS)
Turbo Double Click SOS
On Click Off

LED and Beam

The emitter is a Cree XP-L HD.  The A2S has a smooth reflector, which is surprisingly deep.

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

Tint vs BLF-348 (Killzone 219b version)

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

Random Comparisons and Competitive Options….

Here’s a link to a relevantly filtered page on  I use that site a lot!  As you can see, this is a very filled out category.  Nothing really competes on price, though!


What I like

  • Great price (just $29.99 on amazon!)
  • Full package, ready to roll
  • Good build quality
  • Tail cap design is exceptional
  • Available in NW as well as CW.

What I don’t like

  • PWM on middle modes


  • This light was provided by Wowtac for review. I was not paid to write this review.  Wowtac also has facebook!
  • This content originally appeared at  Please visit there for the best experience!
  • Whether or not I have a coupon for this light, I do have a bunch of coupons!!  Have a look at my spreadsheet for BangGood and GearBest coupons. Please subscribe and get notifications when the sheet is edited!!

6 thoughts on “Wowtac A2S Headlamp Review”

  1. The other Wowtac flashlights use regular 18650 and builds the recharge port into the flashlight itself. The A2S recharges using a battery that has a USB port built in, but the headlamp doesn’t have a USB port. Does that mean the A2S can’t take standard 18650 cells? How hard is it to find these special 18650 batteries?

  2. Pingback: Wowtac A2 - Flashlight Review: Wowtac A2 Headlamp - Alloutdoor.Com

  3. Thanks for the review! I have Thrunite TH30 and TH10 v2 and they are great headlamp. This budget option is very attractive. It is not regulated but I think it’s not a problem. At high mode the output is 2/3 after 2 hours and still more than half after 3 hours. This means you will like not notice it has dropped until 3 hours or so.

    You mention PWM as a con. But if it’s 20khz it will hardly ever be noticeable for the eyes, right?
    So it’s not really a problem at all I think.

    About that it sometimes stepdown to low from high this is timebased. If you turn it on at mid mode and push the switch after shorter time than around 3s it goes to high, longer time than that it goes to low before stepping up to mid and high. This is at least the user interface with most of my Thrunite and Wowtac lights and I think it’s the same with A2S.

    Regards, Patric

    1. But if it’s 20khz it will hardly ever be noticeable for the eyes, right?

      I think it’s a con either way, but if it’s never visible, then right, it’s not really a con.

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