Reviewer's Note: I am very backlogged with lights, so expect somewhat less detail than typical in my upcoming reviews.
The TN40 is the latest member in the high-output TN line of flashlights from Thrunite, featuring in this case 4x XP-L HI emitters for maximum throw. Unlike other recent TN models, this one has a custom battery pack (7.2V/6800mAh) with built-in charger. Let's see how it compares to other lights in this high output class …
Manufacturer/Dealer Reported Specifications:
(note: as always, these are simply what the dealer/manufacturer provides – scroll down to see my actual testing results).
- LED: 4xCREE XP-L HI LED
- Runs on: ThruNite Li-ion battery pack (7.2V/6800mAh).
- Working voltage: 5V-9V.
- Charging current/voltage: 7.4V, 3.5A.
- Output & Runtime (Tested with ThruNite 7.2V/6800mAh Li-ion battery pack and for CW. NW parameters is 10% off): Strobe(1100 lumens /9hrs), Turbo(4450 lumens/85mins), High(1780 lumens /2.7hrs), Medium(580 lumens /9.5hrs), Low(90 lumens /2.5days), Firefly (1.2 lumens /57days).
- Peak beam intensity: 331200cd.
- Max beam distance: 1151m.
- Power interface: 1 * DC 5.5 charging port.
- Special Functions: One momentary-on "forward clicky" tactical side switch, and double click to turbo and then strobe Mode.
- Battery Pack Advantage
- More Efficiency: Each of the battery was precisely picked in order to keep each one of them to similar feature. If different batteries were using mixed, the difference will lead the lack of Max output of the flashlight. Hugh amount of resistance will occur while using strings to connect batteries. The higher resistance causes the lower efficiency of batteries.
- Charging faster: The battery package was charging with 8.4V 3.5A high power adopter, it only took 2.8 hours to reach full-charged. However, most of the 18650 charger is 1A output, full charge of 4 * 18650 batteries will take 4 hours.
- Easier to use: Battery package was charging at the same time, which could ensure that each of the battery would be full charged at same time. However, if there is any wrong operation when use 18650 battery charger, it might cause some of the batteries uncharged. It only takes seconds to plug in the charger cable of TN40. Saving more time.
- Safer: It is very high risk to using different type of batteries together, which may cause explosion for that different voltage, different mAh and different resistance may cause the batteries heat inhomogeneous.
- Lens: Anti-reflective coated ultra-clear toughened glass lens
- Smooth Reflector
- Material: AL T6061-T6, Premium type III hard-anodized
- Waterproof to IPX-8 Standard (2 meters).
- Impact resistant: 1.0 meter.
- Working Temperature: -40℃-80℃.
- Dimensions: 173mm (length) x 100mm x 52mm.
- Weight: 785g (including battery).
- Accessories: Shoulder strap*1, Strap ring*1, AC/DC Adapter*1, Spare O-ring*2, Side switch Cap*1, Tail switch Cap*1, Anti-dust plug*1
- MSRP: ~$260
Packaging is the standard hard cardboard box from Thrunite, with packing foam inside. Included with the light are several spare O-rings, shoulder strap, AC/DC adapter, spare side switch cap, spare tail indicator cap, and spare dust cover. A very limited manual was included on mine (but Thrunite did send me an electronic spec sheet with instructions).
All dimensions directly measured, and given with no batteries installed (unless indicated):
Thrunite TN40: Weight (with battery pack): 780.0g, Length: 171mm, Width (bezel): 100.1mm
Thrunite TN36: Weight: 390.4g, Length: 125.4mm, Width (bezel): 64.0mm
Thrunite TN35 (MT-G2): Weight: 571.4g (723g with 3x18650), Length: 201mm, Width (bezel): 78.9mm
Acebeam K70: Weight: 584.6g, Length: 204mm, Width (bezel): 88.1mm
Eagletac SX25L3 3x18650: Weight: 315.9g, Length: 150.2mm, Weight (bezel): 47.0mm
Fenix TK75: Weight: 516.0g (700g with 4x18650), Length: 184mm, Width (bezel): 87.5mm
Nitecore TM11: Weight: 342.6g (476g with 8xCR123A), Length 135.3mm, Width (bezel): 59.5mm
Niwalker MM15: Weight: 333.7g (without handle), 355.9g (with handle), (539g with 4x18650 and handle), Length: 114.6mm, Weight (bezel): 63.7mm
Niwalker MM18: Weight: 510.g (without handle), 534.1g (with handle), Lenth: 135.3mm, Width (bezel): 73.9mm
The TN40 is relatively compact for such a high-output "throwy" light. The head/bezel is a quite a bit wider than most members of this compact multi-emitter class. Anodizing is a flat black, and is in excellent shape on my sample. Body labels are very minimal, and clear. Knurling on the body handle is aggressive, which definitely helps with grip. There are a number of attachment points for a shoulder strap or wrist lanyard. The light can tailstand stably.
Screw threads are square-cut. Threads are anodized, so the light can be easily locked out by twist of the head.
The TN40 uses a single side-mounted electronic switch to control on/off and mode switching. Switch feel is about typical, and there is a definite "click" when making full contact. Scroll down for a discussion of the user interface.
As mentioned above, the light uses a custom battery pack of 7.2V/6800mAh – which is the equivalent of 4x18650 in a 2s2p arrangement. While some may regret the inability to use your own cells, at least everything is well matched and regulated here. The light comes with a rapid 3.5A AC/DC charger.
Total charging time is reported as 2.8 hrs, which seems accurate in my testing (i.e., the indicator on the charging brick turned from red to green in under 3 hours on each of my charging runs). Click the tail switch during charging for an LED indicator of charging status (with <10% as red,
10%-25% as flashing red, 25-50% as purple, and 50-100% as blue).
For checking the battery capacity when off, simply press the tail switch. The switch LED will indicate battery status (with <20% shown as flashing red, 25%-50% as flashing purple, 50-95% as flashing blue, and 96-100%, as constant blue). Note that charging will not initiate until you have <95% charge status.
The TN40 is distinctive for its use of four XP-L HI emitters, located in rather wide and smooth reflector wells.
This head design and choice of emitter is clearly optimized to produce very good throw. Scroll down for beamshot comparisons to other recent high-output lights.
Click the side switch to turn the light on/off.
When the light is on, press-and-hold the side switch to cycle through Low > Medium > High, in a repeating loop. The light has mode memory and remembers your choice.
To access Turbo, from any mode, double-click the switch. To access Strobe, double-click again from Turbo.
To access Firefly, from Off, press-and-hold the switch. Note that Turbo, Strobe and Firefly are not on the main sequence.
From Off, the light will turn on is the last memorized mode (except for Firefly, Turbo, and Strobe).
Thrunite reports that the light will automatically lower the output when the internal temperature of the driver rises to 80 degrees C.
For more information on the overall build and user interface, please see my new video overview:
As with all my videos, I recommend you have annotations turned on. I commonly update the commentary with additional information or clarifications before publicly releasing the video.
There is no sign of PWM that I can see, at any output level – the TN40 is fully current-controlled.
Strobe was a typical fast tactical strobe of 13Hz.
A standby current drain is inevitable on the TN40, due to the electronic switch in the head. After an initial ~0.6mA connection current, the standby drain drops to a sustained 38.5uA. That would mean that the 6800mAh pack would be fully drained in a little over 20 years (theoretically). Since this is below the self-discharge rate of Li-ion, it is not at all a concern.
Note that you can easily break this current by unscrewing the head slightly, thanks to the anodized threads. I recommend you do for this for lowering the risk of accidental activation – it certainly is not necessary from a current drain perspective.
All lights are on protected 18650 ICR chemistry batteries, except for the TN40 which is on its custom cells. Lights are about ~0.75 meter from a white wall (with the camera ~1.25 meters back from the wall).
It is always hard to compare high output lights at this ridiculously close distance. But a few general observations present themselves.
First, the TN40 is indeed very throwy – it has incredibly focused output for a 4x emitter setup. Overall output is surprisingly high as well (although not as high as the 3xMK-R TN36). There are also a number of artifacts in the TN40 spillbeam (due to the overlapping well design), but these are hard to see above. To tell more, you really need to move outdoors.
For outdoor shots, these are done in the style of my earlier 100-yard round-up review. Please see that thread for a discussion of the topography (i.e. the road dips in the distance, to better show you the corona in the mid-ground). Note there are a lot of bugs out at this time of year, so expect to see some flight trails.
For peak beam distance, you can see than the TN40 falls more in line with the thrower group (XHP35 K70 and XM-L2 dedome K50vn) than it does the usual high-output group (XHP70-based K60 and SD75). This is an incredible amount of throw for a multi-emitter light – while still maintaining a lot of overall output. Scroll down for direct beam measurements.
All my output numbers are relative for my home-made light box setup, as described on my flashlightreviews.ca website. You can directly compare all my relative output values from different reviews - i.e. an output value of "10" in one graph is the same as "10" in another. All runtimes are done under a cooling fan, except for any extended run Lo/Min modes (i.e. >12 hours) which are done without cooling.
I have devised a method for converting my lightbox relative output values (ROV) to estimated Lumens. See my How to convert Selfbuilt's Lightbox values to Lumens thread for more info.
Throw/Output Summary Chart:
My summary tables are reported in a manner consistent with the ANSI FL-1 standard for flashlight testing. Please see http://www.flashlightreviews.ca/FL1.htm for a discussion, and a description of all the terms used in these tables. Effective July 2012, I have updated all my Peak Intensity/Beam Distance measures with a NIST-certified Extech EA31 lightmeter (orange highlights).
As predicted by the beamshots, the TN40 is an incredible thrower. Among my 4x18650-class lights, only the single-emitter XHP35 Acebeam K70 out-throws it (but with less output overall). This is an incredibly strong showing for a 4xXP-L light.
Now there's something you don't see very often – my output measures on Hi actually exceed the reported specs. Most of the other levels seem pretty accurate, in contrast.
As always, my standard runtimes are done under a cooling fan.
The light shows a series of step-downs on Turbo, and consistently flat-stabilized runs at Hi and Med levels.
On initial glance, the Hi mode runtime results support my output measures above (i.e., I get higher output but lower runtime than reported in the specs). Of course, those specs are not likely based on fan-cooled runtimes. Given the thermal regulating feature of this light, you could expect longer runtime (at reduced output) without external cooling. To see the effect of heat on throttling output better, let's see what happens if I don't use a cooling fan:
As expected, output drops sooner when no external cooling is applied. Max runtime is still lower than spec though, consistent with the greater output I am detecting here.
The light uses a temperature-mediated step down on Turbo, but I still find it gets very hot with sustained runtime on Turbo.
A custom built-in battery pack is provided, and the user cannot substitute 18650 cells. Performance of the pack is consistent with good quality 18650s (i.e., 4x 3400mAh cells, arranged 2s2p). The bundled fast charger will fully charge the battery pack in under 3 hours.
In keeping with the incredibly high throw (and deep multi-well reflector design), there are noticeable beam artifacts in the periphery of the spillbeam. But this light does have the greatest throw I've ever seen for a multi-emitter light.
Due to the electronic switch in the head, the light has a stand-by current when the battery pack is connected. But this is completely negligible, and not a concern. To prevent accidental activation though, I recommend you lock the light out by a simple twist of the head.
The TN40 is an outstanding thrower – one of the furthest throwing I've ever tested, in fact. This is remarkable when you consider it actually has 4 emitters in there (XP-L HI).
Following up on the maximum flood TN36 model, this further broadens the Thrunite line of relatively compact, modern high-output lights. The interface is a little different now, with Turbo and Firefly off the main sequence (available as a double-click and press-hold-from-off, respectively). But it is otherwise quite intuitive and easy to use.
Like the TN36, there is a thermal sensor mediated step-down that reduces output when run at the highest levels. I only noticed it kicking in on the Turbo runs (but of course, all my runtimes are done under a cooling fan). I don't find the TN40 gets as hot in operation, and the light seems to do repeated step-downs now as it warms up.
I know some users won't like the custom battery pack idea, but its performance is consistent with current top-of-the-line 4x3400mAh 18650 batteries. And Thrunite does provide an incredibly fast in-light AC charger (3.5A, fully charges the pack in under 3 hours). Regulation and output/runtime efficiency were excellent for this class.
In terms of beam profile, the TN40 is knock-out thrower. I knew this early on in testing, as I found the reflected hotspot too bright to look at on the walls of my house. But the beam intensity measures and outdoor shots really show the performance. They have done an incredible job on the reflector, which is shallower than I would have expected. That said, expect considerable spillbeam edge artifacts, due to the overlapping wells. I'm glad to see they are offering this light in both CW and NW (CW tested here).
Fans of throw will find much to like here. While some recent XHP35 lights can out-throw it (e.g., the Acebeam K70), the TN40 has an outstanding level of overall output (closing in on ~5000 lumens on my sample). Coupled with a reasonably compact build, serviceable user interface, and hassle-free battery pack/charger, I expect this light will garner a lot of interest.
TN40 was supplied by Thrunite for review.