ThruNite TN10

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ThruNite started a few years ago with a small light, then they added a very good thrower (Catapult) and has lately added lots of other lights to their range. The light I am looking at here is a light in 18650 size. The light has 2 settings where one is programmable, to change between them the head must be either tight or loose. On/off is done with a forward tail switch. The light is made of aluminum with hard-anodized (Type 3) finish.

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The light is delivered in a cardboard box with a window and some FL1 specification on the outside


The box contains the light, 3 extra o-rings, lanyard, split ring, holster, a clips and a instruction sheet.

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The light uses a smooth reflector with a XM-L led in the center. The bezel is in stainless steel.

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The head has some groves on it, the edge on the groves is a bit sharp, these does improve the grip. There is also the typical heat sink of high power led lights.


The backside of the head shows the connection to the battery, this connection is a spring. Around the periphery is a metal ring that is used for mode changes.


The user interface has two brightness settings, one fixed with head tight and one programmable with head loose.


Doing two tight/loose sequences of the head quickly in sequence will activate the programming. The light will repeatedly show the above sequence and a tight/loose sequence will lock the mode/brightness at that point as the programmed setting.

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The battery tube has square cut threads and o-rings to seal the light. The tail thread is anodized, making it possible to lock out the light.


The body has the same type of groves as the head.


Inside the battery tube was a extra plastic tube, making it possible to use CR123 batteries with very little rattle.

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The light has a removable tactical ring, this ring can also be used for the lanyard. When removed there is nothing to protect the threads. This ring also works as an anti roll device.


The body with the clip mounted. There is no lock for the clip, but the tactical ring does help to hold it.

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In the tailcap is a covered spring. The switch is mounted lower than the two ridges, making it possible for the light to tail stand.
With a split ring mounted in one of the holes, it is possible to use it for the lanyard.

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A holster is supplied with the light.


Here is all the part the light can be disassembled in without tools.

This light is the usual size for a 18650 light, performance is in the good end both total output and throw. As long as there is only a need for two settings, the user interface is fine and it is easy to reprogram, but reprogramming is a bit slow to use for just changing brightness. For some uses it is very practical that high can always be selected (Just tighten the head).
I would have preferred that it had full performance in 18650 batteries.

Technical specification and measurements


The light is rated for use with 1x18650 or 2xCR123 batteries. The light works fine with all 18650 batteries from 65 to 70 mm long.

Measured size and weight:
Length: 145 mm
Diameter: 24.2 mm to 35.6 mm
Weight: 188 gram with 2xCR123 and 203 gram with AW18650-26.

The light uses a Cree XM-L led.


In the above table I have collected all modes, measured at 3.7 volt (i.e. with one LiIon batteries). All the estimated runtimes are with a 18650 LiIon battery. The estimated lumen is scale from the specified maximum, measured at 7.4 volt.
Because I have done this table at 3.7 volt, there is no difference between high, adj-high and the high-reduced.


The first voltage sweep is done in high mode, the light has stabilization down to about 4 volt, this means that it reaches full output with a fresh LiIon battery, but will immediately start to drop in output.


The reduced brightness is about 80% of max. brightness and can stabilized down to 3.8 volt.


The adjustment mode has a maximum of about 85% brightness.


The adjustment mode has a minimum of about 4% brightness.


In the runtime the step down function in high can easily be seen. Neither 18650 or 2xCR123 batteries can maintain a high enough voltage to keep the light in stabilization.


To see how this light handles the heat, I did a run on my test bench with a temperature sensor on the light. As expected the brightness drops slightly when the led gets hot. The body does get hot and stays hot. There is no step down in brightness (The voltage is to low for this to be visible).
Note: My test does not simulate actual usage conditions, but are done on a test bench with only the head of the light and no cooling airflow, i.e. the light will get hotter than during normal use.


With higher voltage the step down is visible after about 3 minute. This step down does limit the temperature rise.


The slow strobe is 4.9 Hz with 48% duty cycle.


The fast strobe is 9.8 Hz with 46% duty cycle.

The light does not use pwm and only has a small amount of high frequency noise in the light.

Comparison to other Flashlights

ThruNite TN10, ThruNite TN12, ThruNite Scorpion:
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Sunwayman V20C, Fenix TK21 U2, Olight M21-X:
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For the full comparison to other lights with graphs and beamshots see here


The light was supplied by ThruNite for review.