Thrunite T1S Flashlight Review

Thrunite T1S Flashlight Review

The Thrunite T1S flashlight has hit the market as an updated T1. The T1 was already great – let’s see if the T1S is more compelling! Read on!

Official Specs and Features

Here’s a link to the Thrunite T1S flashlight product page.


It seems there is just one version of the Thrunite T1S flashlight at this time.  Amazon shows two body colors available, though – black (seen here) and Grey.  (The grey looks very nice indeed!)


The Thrunite T1S flashlight ships for a reasonable $39.95, and is available at this time only in cool white.  The Thrunite T1S flashlight in black is available on Amazon, and Grey is too, but it’s a little costlier at $45.95.

Short Review

Another great 18350 flashlight by Thrunite.  I already liked the original (black) T1 a lot.  Then I liked the T1 in Military Tan a lot.  This T1S version adds USB-C charging, which is an obvious upgrade, but also throws in a TIR and a new emitter.  For the price, it’s a great consideration.

Long Review

The Big Table

Thrunite T1S Flashlight
Emitter: Luminus SST-40 (Cool White)
Price in USD at publication time: $39.95 (black) is available on
$45.95 (grey) is also available on
Cell: 1×18350
Turbo Runtime Graph High Runtime Graph
LVP? Switch warning
Switch Type: E-Switch
Quiescent Current (mA): 0.03
On-Board Charging? Yes
Charge Port Type: USB-C
Charge Graph
Power off Charge Port with cell: lowest 2 modes
without cell or without body: lowest two modes (but firefly blinks a little)
Claimed Lumens (lm) 1212
Measured Lumens (at 30s) 1123 (92.7% of claim)^
Candela per Lumen 8.2
Claimed Throw (m) 184
Candela (Calculated) in cd (at 30s) 433lux @ 4.983m = 10752cd
Throw (Calculated) (m) 207.4 (112.7% of claim)^
Claimed CCT Cool White
Measured CCT Range (K) 5100-5600 Kelvin
Item provided for review by: Thrunite
All my Thrunite 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

Thrunite T1S flashlight what's included

  • Thrunite T1S flashlight
  • Thrunite 1100mAh 18350 (protected, button top)
  • Charge cable (USB to USB-C)
  • Spare o-rings (2)
  • Pocket clip
  • Lanyard
  • Spare charge port cover (2)
  • Manual and papers

Package and Manual

Thrunite T1S flashlight box


Build Quality and Disassembly

Thrunite T1S flashlight

I did really like the original T1.  I actually am (apparently?) a pretty big fan of Cree XHP50.2 emitters (which the T1 did use), especially since they’re available in CCTs that I find favorable (anything below 5000K).  So the T1S is an iteration of a design I already like.

The new design is good.  I wouldn’t call these changes revolutionary, but more iterative.  The new grip is good enough, for example.

The threads on the cell tube are anodized, square-cut, and short.  I find that the head really has to be squeezed onto the body to get the threads to grab.  This becomes especially noticeable if the pocket clip is installed.

Thrunite T1S flashlight head removed showing threads

The head has a brass button.  The button isn’t shrouded, nor is it springy, but the light does work just fine with any 18350 (including those that are actually sized according to their name – 35mm long cells).  The tail end has a big spring, and also a magnet.  The tail/cell tube is one piece.

Thrunite T1S flashlight internal contacts

Size and Comps

Weight:  41.5g without 18350
Dimensions:  69.5mmx 26.5mm x 22mm.  These are exactly the same dimensions as the T1.

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).

Thrunite T1S 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.

Thrunite T1S flashlight beside torchlab boss 35

Thrunite is particularly interested in how the T1S compares to a light like the Olight Baton.  Here you can see the size comparison – the Red Olight is an S1R Baton II.  While the Thrunite T1S is a bigger flashlight, it’s still very much in the EDC realm.  Also take into consideration that it uses a standard 18350 cell, whereas the Olight uses a proprietary 550mAh 16340 cell.

That Olight also has a proprietary charge connector, and the Thrunite T1S uses a USB-C charge port.

Retention and Carry

First, let’s mention the magnet in the tailcap.  The magnet is quite strong and holds the light easily.  I think it’d be possible to pull the spring and take the magnet out, but I did not try.

Thrunite T1S flashlight magnet

Next is the pocket clip.  It’s a friction fit clip and lives only on the tail end of the light.  It’s a double direction clip, though the mouth doesn’t allow too great access for bezel up carry.  In fact, the shoulder doesn’t offer great ease of access either – I had to fiddle with the clip (ie two-handed operation) every time I put the light on my pocket.  Not a huge deal, but just another reason I don’t care for these types of clips.

Thrunite T1S flashlight pocket clip hug

The clip should allow the light to be used as a hatlight, too.

Thrunite T1S flashlight pocket clip

There’s also a lanyard, which should be connected through the hole in the tailcap.

Thrunite T1S flashlight lanyard installed

Power and Runtime

Thrunite includes the cell intended for powering the Thrunite T1S flashlight.  It’s an 18350 cell, with Thrunite added protection, and a button top.  Those two things make it quite long to be sure, but of course, it fits in this light easily.  I measure the cell at 39.7mm long.

Thrunite T1S flashlight with included 18350 cell Thrunite T1S flashlight included 18350 cell

As you can see, the Thrunite 18350 is much longer than an unprotected flat top 18350.

The Thrunite cell protrudes around 3mm out of the light, while the unprotected 18350 is around 1mm below the lip.

The cell does go into the light in the usual way – positive end toward the emitter.

Thrunite T1S flashlight included 18350 cell installed

Runtimes follow.  I was surprised to note that the T1S does not seem to have ‘normal’ low voltage protection. By that, I mean that while the light did shut off sometimes (once), even then it was too low – around 2.5V.  On bench power, I noticed the light shut off around there too – 2.5V or so.  That’s too low.  There’s also no point in letting it go that low.  So little energy is available for running a light that low, that it’s not useful.

runtime graph Thrunite T1S flashlight runtime graph Thrunite T1S flashlight runtime graph


The light also sports on-board charging, via a USB-C port in the head, opposite the switch.  The port has a big rubber press-in cover and seems well protected.

The charge rate here is about like we saw for the other T1.  Very steady current and a nice clean cutoff.

Thrunite T1S flashlight charging graph

It’s great to note that USB-C charging works just fine too.

Thrunite T1S flashlight charging graph

During charging, the switch indicator is red.  When charging is complete, the switch turns blue.

Modes and Currents

Mode Mode Claimed Output (lm) Claimed Runtime Measured Lumens Tailcap Amps
Turbo 1212/317 5m/70m 1123 3.07
High 407 80m 413 0.72
Medium 94 5.5h 94 0.15
Low 7 44h 19.8mA
Firefly 0.5 27d 1.76mA

Pulse Width Modulation

No PWM is noted.

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 PWM 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

There’s a single switch on the Thrunite T1S flashlight.  It’s an indicating e-switch on the head.  The button has a black look but really seems to be an opaque gray – of course, since it’s also an indicating switch.  The feel of the switch and charge port are different but similar enough that it’s a bit difficult to differentiate them without looking.

Thrunite T1S flashlight e-switch

The switch does have an indication function, too, as follows:

Blue: 3.2-4.2V (or 21%-100%)
Red: 2.9-3.2V (or 11-20%)
Red Flashing: 2.6-2.9V (or 1-10%)
Off: 0-2.6V (or 0%)

Here’s a UI table!

State Action Result
Off Click On (Mode Memory except for Firefly, Turbo, Strobe)
Off Hold 1s Firefly
Firefly Hold 2s Lockout
Lockout Click No Output (switch indicates red)
Lockout Hold 2s Firefly
On Click Off
On (Except Firefly) Hold Mode advance (LMH)
Any Double Click Turbo
Any Triple Click Strobe

Note that this user interface is pretty much like the Thrunite T1, with the exception that the T1S does not have ramping.  I consider that a great upgrade, and sort of back to the Thrunite roots.  It feels much more natural, anyway.

LED and Beam

With this updated version, Thrunite has opted to use a Luminus SST-40 emitter.  Thrunite has gone the way of cool white, too, and for now, that’s the only option available.

Thrunite T1S flashlight emitter

Unlike the T1 (which used a reflector), the T1S uses a TIR.

Thrunite T1S flashlight on

This TIR provides a surprisingly (maybe “amazingly”) tight beam pattern, and this light will absolutely be more throwy than you expect.

Thrunite T1S flashlight on

LED Color Report (CRI and CCT)

This cool white is definitely not the worst cool white available.  We see from the low 5100K’s to around 5600K – yes that’s cool but more often than not when we think about “cool” we’re thinking about “over 6000K.”  So let’s call this a win (ish).


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

  • Complete package
  • Size
  • It’s a good E-Switch 18350 light
  • The included cell has a good capacity
  • Indicating switch
  • Updated to use USB-C charging (and C to C works!)

What I don’t like

  • I think it could be even shorter (by using a real 18350, not this long (but standard) one)
  • The included cell is quite long
  • I don’t like these two-way clips
  • It’s not possible to cycle the main modes from Firefly


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2 thoughts on “Thrunite T1S Flashlight Review”

  1. Really tempting. Should be a great for emitter swaps. Maybe even a triple.

    I had the T1 in NW but the green tint was too much for me. Gave it to a less picky friend.

  2. What were they thinking when choosing the voltage threshold for low-battery warning? That indicator is a disappointment.
    For the Shockli 18350 cells that I use, 3.2 V corresponds to 5% State of Charge according to HKJ’s measurements (should be around 5% to 10% for most current chemistries, and well below 0% for traditional ones), so the light will essentially show blue all the way until the battery is drained.
    So the light does tell you when to charge, which is useful, but it does not warn you that you are running low even though it technically could.

    Apart from that, I would like to see a neutral white version.
    And of course, making it more compact would be nice, but it’s already quite good. Reducing the head diameter by just another 1 mm would make a difference for pocket carry.

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