Thrunite Thrower Headlamp Review

Thrunite Thrower Headlamp Review

Thrunite has introduced the Thrower Headlamp, an aptly named Luminus SFT-40 emitter headlamp with USB-C charging that really throws! Read on!

Official Specs and Features

Here’s a link to the Thrunite Thrower Headlamp product page.


There’s just one version of the Thrunite Thrower Headlamp.


The Thrunite Thrower Headlamp sells for $49.95 right now, and at that price includes the 18650 cell you see in this review. It’s listed at $49.99 on Amazon, but you can apply a 20% off coupon, bringing the Thrunite Thrower Headlamp under $40 (referral link)!

Short Review

Well, this is definitely a thrower of a headlamp! So as far as an item meeting the specification implicated in the title, it’s done that! Throw is great. The output is good too. USB-C charging works well, charging at nearly 2A. All in all, this is a great value headlamp at around $40!

Long Review

The Big Table

Thrunite Thrower Headlamp
Emitter: Luminus SFT-40 (Cool White)
Price in USD at publication time: $49.95 or $40 on amazon with coupon! (referral link)
Cell: 1×18650
Turbo Runtime Graph High Runtime Graph
LVP? Switch warning
Switch Type: E-Switch
Quiescent Current (mA): 0.02
On-Board Charging? Yes
Charge Port Type: USB-C
Charge Graph
Power off Charge Port “with cell: Firefly only
without cell or body: Firefly only”
Claimed Lumens (lm) 1755
Measured Lumens (at 30s) 1642 (93.6% of claim)^
Candela per Lumen 18.2
Claimed Throw (m) 323
Candela (Calculated) in cd (at 30s) 1167lux @ 5.555m = 36011cd
Throw (Calculated) (m) 379.5 (117.5% of claim)^
Claimed CCT CW
Measured CCT Range (K) 7000 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 Thrower Headlamp what's included

  • Thrunite Thrower Headlamp
  • Thrunite 3400mAh 18650
  • Spare o-rings (2)
  • Charging cable (USB to USB-C)
  • Spare charge port cover
  • Headband etc
  • Manual

Package and Manual

Thrunite Thrower Headlamp box Thrunite Thrower Headlamp box Thrunite Thrower Headlamp label

Thrunite Thrower Headlamp manual

Build Quality and Disassembly

Thrunite typically makes a nice quality item, and the Thrunite Thrower Headlamp is no exception. There’s nothing I would say directly “this should be made better.”

Thrunite Thrower Headlamp

As far as the build goes, the Thrunite Thrower Headlamp is nearly exactly like the TH30 V2, which I have tested.

Below you can see the tailcap spring. There’s no magnet under that spring (which I find a bit unusual).  The threads are short and appropriately lubed. They’re square cut and anodized, too – mechanical lockout is possible with just a short twist.

Thrunite Thrower Headlamp tailcap off

The positive end has a brass button, but I failed to get a pic of that.

Size and Comps

Officially: 107.5mm x 26.5mm x 23mm and 56g without the cell.

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 Thrower Headlamp 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 Thrower Headlamp beside the TorchLAB BOSS 35 (custom engraved)

Retention and Carry

The primary means to carry this light will be the headband.  The strap is a nice rubber (silicone?) band.  The light has smooth indentions which hold the light tightly but still allow the light to rotate, too.

Thrunite Thrower Headlamp headband Thrunite Thrower Headlamp headband Thrunite Thrower Headlamp headband Thrunite Thrower Headlamp headband

And that’s it! There’s no magnet here. No pocket clip is included, either!

Power and Runtime

A single 18650 runs this headlamp.  The button on the positive end would cause no problems using any type of 18650 (button or flat).  Do be aware that Turbo requires a lot of the cell (around 8A), so you need to use a high-quality cell for this light.

Thrunite Thrower Headlamp with included 18650

Thrunite includes this 3400mAh button top cell.

Thrunite Thrower Headlamp included 18650

The cell is installed with the button toward the head.

Thrunite Thrower Headlamp included 18650 installed

Here are a few runtime tests. Stepdown from the initial 1847 lumens happens at around 1 minute, and then the output drifts downward.  High and Medium have approximately the same profile (but without the initial high level stepping down).

Thrunite Thrower Headlamp runtime graph Thrunite Thrower Headlamp runtime graph Thrunite Thrower Headlamp runtime graph

I didn’t observe low voltage protection in these tests, but the switch did indicate when the cell was low.  It indicates as follows:

Blue: 21-100% power
Red: 11-20% power
Flashing Red: 1-10% power
Off: 0% power


The Thrunite Thrower Headlamp has on-board charging, too.  The head has a USB-C port, which is covered by a rubber boot.  Connection of the cover to the body is very snug and secure (an improvement from the TH30 V2, I’d say).

Charging works well, and the CC phase is around 2A for the duration.  It’s also very consistent.

Thrunite Thrower Headlamp charging graph

C to C charging works, too!

Thrunite Thrower Headlamp charging graph

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

Modes and Currents

Mode Mode Claimed Output (lm) Claimed Runtime Measured Lumens Tailcap Amps
Turbo 1755~373 5.5m~240m Initial: 1847
30s: 1642
High 735~395 6.5m~240h 583 2.88
Medium 258 10h 273 0.68
Low 62 48h 59 0.16
Firefly 0.4 39d 0.4 2.2mA

Pulse Width Modulation

I’d call this use of PWM on the middle three modes to be quite surprising by Thrunite. It probably won’t bother you, except in Low where it could be reasonably be seen by most people.

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

The Thrunite Thrower Headlamp has a single switch on the head.  It’s an e-switch, with two indicating emitters; red and blue.  The switch is held in place by a bezel I couldn’t remove (not sure if it’s screwed in or press-fit, but there are no reliefs, so it’s likely press-fit) This might not seem like a big deal but have a look at it below.  It’s very smooth and great for button-pressing-comfort.

Thrunite Thrower Headlamp e-switch Thrunite Thrower Headlamp e-switch profile

Thrunite Thrower Headlamp e-switch indicating

Here’s a UI table!

State Action Result
Off Click On (Mode Memory except for Firefly, Turbo, and SOS)
Off Hold Firefly
Any Double Click Turbo
On Hold Mode Advance (L, M, H) (No Firefly, Turbo, or SOS)
Any Triple Click SOS
On Click Off

There is no strobe!

LED and Beam

One of the few things that makes this throwy headlamp the Thrower Headlamp is this Luminus SFT-40 emitter. The small emitting area plus the smooth reflector gives a beam with a very tight hotspot.

Thrunite Thrower Headlamp emitter

Thrunite Thrower Headlamp reflector

Thrunite Thrower Headlamp bezel Thrunite Thrower Headlamp emitter on low Thrunite Thrower Headlamp emitter on

If you doubt, check out the cd/lm in the table way up top.  At cd/lm of 18, it’s a very throwy headlamp!

LED Color Report (CRI and CCT)

Quite a range of CCT on this emitter. But that’s from the wide range of drive it sees – from in the mA range to all the way up around 9A.  From around 5700K to up around 7300K.  CRI is unsurprisingly low too, at around 67. There’s a price to be paid for all that throw out of one emitter, and that’s the price!


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

  • Throw is ridiculous for a headlamp!
  • UI is very simple and pretty good.
  • Build quality is good
  • Full package is included
  • Hits the numbers (throw and output)
  • Updated to USB-C charge port

What I don’t like

  • Big stepdown from the initial output
  • Cool white only


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