Warning: pic heavy, as usual. 
REVIEWER'S NOTE: This model has been updated for 2014 with a new emitter, higher max output, and new dual-switch interface. The old model reviewed here has been discontinued. Please see my review of the currently shipping TN12-2014 model.
The TN12 is a compact EDC-style 1x18650/2xCR123A light from Thrunite. Let's see how it compares to other lights in this class …
Common Manufacturer Specifications:
Packaging includes a good number of extras in both cases – along with the light, you get a decent quality holster and wrist lanyard, extra o-rings and spare tailcap switch, GITD switch boot cover, stainless steel pocket clip, 2xCR123A battery plastic tube (to prevent rattle), and manual.
From left to right: Redilast protected 18650; Thrunite Scorpion V2 Turbo, TN11, TN10, TN12; NiteCore IFE2; Lumintop ED20; 4Sevens Quark 123-2 X.
All dimensions are given with no batteries installed:
TN12: Weight: 64.0g, Length: 126.9mm, Width (bezel): 24.1mm
4Sevens Quark Q123-2 X (Regular tailcap): Weight: 44.6g, Length: 112.7mm, Width (bezel) 22.0mm
Lumintop ED20: Weight 84.4g, Length 121.6mm, Width (bezel) 25.2mm
Zebralight SC600: Weight 87.2g, Length: 107.8mm, Width (bezel) 29.7mm
Spark SL6: Weight 77.8g, Length: 125.5mm, Width (bezel): 30.9mm
The TN12 is certainly well in keeping with the overall dimensions and weights of other lights in this class. It is actually the lightest light I've seen that is wide enough to take 18650 cells.oo:
Overall build and dimensions are fairly compact for this class light. Light uses knurling of reasonable aggressiveness on the body and tailcap, providing excellent grip. Anodizing is matte black. Labels are bright white against the black background.
The light can tailstand, but is a bit wobbly if not clicked on. The light has a slightly beveled bezel opening.
Light uses standard-cut screw threads, anodized for lock-out.
User Interface
The lights use a forward clicky switch for on/off, and head twists for mode control. Press and hold the clicky for momentary, press and release for constant on (i.e. click on).
Mode switching is controlled by a loosen-tighten twist of the head. With the head tight against the body, you get the memorized output mode. Do a rapid loosen-tighten switch to advance to the next output mode. Sequence is Firefly – Lo – Med – Hi –Strobe, in repeating sequence. Light has memory, and retains the last setting used after turning off and back on.
For a more detailed examination of the build and user interface, please see my video overview: :wave:
Video was recorded in 720p, but YouTube defaults to 360p. Once the video is running, you can click on the 360p icon in the lower right-hand corner, and select the higher 480p to 720p options, or even run full-screen.
PWM/Strobe
Like the other members of Thrunite family, there is no sign of PWM that I can see, at any output level. I believe the light is current-controlled as claimed.
Strobe was measured at a fairly typical fast 9.6 Hz.
Beamshots:
The TN12 uses a fairly deep (but narrow) reflector for a light this size. Reflector is textured with a light OP (orange peel) finish. Cool white XM-L emitter was well centered on my sample.
And now, what you have all been waiting for. All lights are on 1x18650, about ~0.75 meter from a white wall (with the camera ~1.25 meters back from the wall). Automatic white balance on the camera, to minimize tint differences.
Spillbeam is not as wide as some of the other lights (which typically have shallower reflectors). However, throw is better than typical.
Testing Method:
All my output numbers are relative for my home-made light box setup, a la Quickbeam's flashlightreviews.com method. 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 recently devised a method for converting my lightbox relative output values (ROV) to estimated Lumens. See my How to convert Selfbuilt's Lighbox 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.sliderule.ca/FL1.htm for a description of the terms used in these tables.
The TN12 is remarkably bright for a light this size, on all battery sources. It is actually fairly comparable on Max to the Thrunite Scorpion V2 and TN11.oo: Firefly mode is as low as other Thrunite Firefly modes as well.
Throw is consistent for a light this size, driven to these levels.
Output/Runtime Comparison:
First, a direct comparison of all Thrunite models on 1x18650
On 1x18650, my TN12 actually measures slightly higher than my Scorpion V2 and TN10, but is otherwise identical.
On 2x sources, the TN12 is driven about the same on Hi/Max as the Scorpion V2, TN10 and TN11.
This is likely to be a problem on 2xCR123A. On the Thrunite Scorpion V2, most primary CR123A cells tripped their built-in PTC resistors during sustained runs at comparable drive levels, even with external cooling applied (see a detailed discussion here). That light didn't have a circuit step-down feature, so the most likely explanation was that the CR123A battery built-in safety PTC resistors were engaging (to limit the current, and thus lower the output and heat). Note that different brands of CR123As have different chemistries/sensitivities, as discussed in that battery thread.
Thrunite informs me that the TN12 has a thermal protection feature designed to protect the circuit from excessive temperature (i.e. greater than 80 degress Celsius at the PCB). However, given that the CR123A runtimes in HKJ's TN12 testing look a lot like what we observed for the Scorpion V2, it seems likely that something similar could be going on here. The reason you don't see this in my runtimes above is that all my tests are done under a cooling fan, and I know from previous experience that the Titanium Innovations cells I use are slower to heat up and trip their PTCs than Duracell or Panasonic cells. That said, when I opened the light after the above Hi 2xCR123A test, both my Titanium Innovations cells had their labels completely ripped apart at the seams (!). :shakehead
Given the similar pattern being observed on extended 2xCR123A Hi runs here, it seems entirely possible that you could trip your CR123A's PTC resistors before the TN12 circuit thermal throttling engages. As such, I recommend you don't run the TN12 on Hi on 2xCR123A for longer than ~5 mins or so.
Potential Issues
The light is driven to extremely high levels on Max, which is a concern for 2xCR123A. Although the light has a built-in temperature sensor to throttle down and protect the circuit from excessive heat, it is possible that you may still trip the PTC safety circuits of your primary CR123A cells before that happens (see commentary above). I recommend you do NOT run the TN12 on Hi on 2xCR123A for longer than ~5 mins continuously.
Strobe mode is on the main sequence (i.e. need to cycle past it to get back to Firefly mode).
Preliminary Observations
The TN12 is a very strong offering in the compact 1x18650 space.
The build is small enough that you can easily store it in pocket or carry it on your belt, making it a good EDC or "backup" light. And the body is wide enough to accommodate protected 18650 cells (including newer higher-capacity flat-top cells, which work in the light). :thumbsup:
The slim-lined build has good ergonomics – including decent knurling for grip. Light can tailstanding (barely, better when clicked on). Tailstanding ridges may obstruct your thumb somewhat, but I still found it easy enough to activate.
Max output is extremely high on the light – output on 1x or 2x battery sources typically rivals the most heavily-driven lights in my collection.oo: Overall efficiency is excellent at all levels, with a good balance of output levels (I like the inclusion of Firefly). Unfortunately, strobe is also in the main sequence.
My main concern is with sustained runtime of 2xCR123A on the Max level, given the much lower mass of this light (i.e. reduced heatsinking). While the TN12 does have a thermal sensor to protect the circuit, it is possible that you may trip your CR123A's PTC circuits before that happens (see discussion above, after the runtime graphs). I would prefer an automatic (i.e. timed) current step-down feature in the circuit, as Thrunite has introduced in the TN10/TN11. :candle:
Beam pattern is smooth and reasonable for a general purpose light (i.e. acceptable throw for a light this size, although less spill than is common). Overall use and handling impressions are positive. As long as you are thoughtful about how long you leave it running on Max, the TN12 has a lot going for it.
REVIEWER'S NOTE: This model has been updated for 2014 with a new emitter, higher max output, and new dual-switch interface. The old model reviewed here has been discontinued. Please see my review of the currently shipping TN12-2014 model.
----
TN12 supplied by Thrunite for review.
REVIEWER'S NOTE: This model has been updated for 2014 with a new emitter, higher max output, and new dual-switch interface. The old model reviewed here has been discontinued. Please see my review of the currently shipping TN12-2014 model.
The TN12 is a compact EDC-style 1x18650/2xCR123A light from Thrunite. Let's see how it compares to other lights in this class …
Common Manufacturer Specifications:
- LED: Cree XM-L U2
- Uses two 3V CR123A batteries (Lithium) or one 18650 rechargeable battery (Li-ion)
- 126mm (Length) x 25.4mm (Diameter)
- 66gram weight (excluding batteries)
- Digitally regulated output - maintains constant brightness
- Cooper base plate for more efficient heatsinking
- Max output: 705 lumens with more than 1 hours for 2 Cr123A
- Max runtime:695 Hours
- Firefly: 0.09lumens. 695 hours. low: 30 lumens:65 hours.mid: 95 lumens: 9 hours. max output: 705 lumens. 72 minutes. strobe: 705 lumens. 140 minutes
- Max beam distance: 205m
- Peak beam intensity: 19536cd
- Impact resistance: 1.2m
- Waterproof to IPX-8 standard
- Reverse polarity protection, to protect from improper battery installation
- Temperature control current to avoid the over heat on the surface and protect the driver from being damaged
- Slip-resistant body design
- Removable Stainless steel clips
- Tactical tail switch with momentary-on function
- Made of durable aircraft-grade aluminum
- Premium Type III hard-anodized anti-abrasive finish
- Toughened ultra-clear glass lens with anti-reflective coating
- MSRP: ~$75
Packaging includes a good number of extras in both cases – along with the light, you get a decent quality holster and wrist lanyard, extra o-rings and spare tailcap switch, GITD switch boot cover, stainless steel pocket clip, 2xCR123A battery plastic tube (to prevent rattle), and manual.
From left to right: Redilast protected 18650; Thrunite Scorpion V2 Turbo, TN11, TN10, TN12; NiteCore IFE2; Lumintop ED20; 4Sevens Quark 123-2 X.
All dimensions are given with no batteries installed:
TN12: Weight: 64.0g, Length: 126.9mm, Width (bezel): 24.1mm
4Sevens Quark Q123-2 X (Regular tailcap): Weight: 44.6g, Length: 112.7mm, Width (bezel) 22.0mm
Lumintop ED20: Weight 84.4g, Length 121.6mm, Width (bezel) 25.2mm
Zebralight SC600: Weight 87.2g, Length: 107.8mm, Width (bezel) 29.7mm
Spark SL6: Weight 77.8g, Length: 125.5mm, Width (bezel): 30.9mm
The TN12 is certainly well in keeping with the overall dimensions and weights of other lights in this class. It is actually the lightest light I've seen that is wide enough to take 18650 cells.
oo:
Overall build and dimensions are fairly compact for this class light. Light uses knurling of reasonable aggressiveness on the body and tailcap, providing excellent grip. Anodizing is matte black. Labels are bright white against the black background.
The light can tailstand, but is a bit wobbly if not clicked on. The light has a slightly beveled bezel opening.
Light uses standard-cut screw threads, anodized for lock-out.
User Interface
The lights use a forward clicky switch for on/off, and head twists for mode control. Press and hold the clicky for momentary, press and release for constant on (i.e. click on).
Mode switching is controlled by a loosen-tighten twist of the head. With the head tight against the body, you get the memorized output mode. Do a rapid loosen-tighten switch to advance to the next output mode. Sequence is Firefly – Lo – Med – Hi –Strobe, in repeating sequence. Light has memory, and retains the last setting used after turning off and back on.
For a more detailed examination of the build and user interface, please see my video overview: :wave:
Video was recorded in 720p, but YouTube defaults to 360p. Once the video is running, you can click on the 360p icon in the lower right-hand corner, and select the higher 480p to 720p options, or even run full-screen.
PWM/Strobe
Like the other members of Thrunite family, there is no sign of PWM that I can see, at any output level. I believe the light is current-controlled as claimed.
Strobe was measured at a fairly typical fast 9.6 Hz.
Beamshots:
The TN12 uses a fairly deep (but narrow) reflector for a light this size. Reflector is textured with a light OP (orange peel) finish. Cool white XM-L emitter was well centered on my sample.
And now, what you have all been waiting for.
All lights are on 1x18650, about ~0.75 meter from a white wall (with the camera ~1.25 meters back from the wall). Automatic white balance on the camera, to minimize tint differences.
Spillbeam is not as wide as some of the other lights (which typically have shallower reflectors). However, throw is better than typical.
Testing Method:
All my output numbers are relative for my home-made light box setup, a la Quickbeam's flashlightreviews.com method. 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 recently devised a method for converting my lightbox relative output values (ROV) to estimated Lumens. See my How to convert Selfbuilt's Lighbox 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.sliderule.ca/FL1.htm for a description of the terms used in these tables.
The TN12 is remarkably bright for a light this size, on all battery sources. It is actually fairly comparable on Max to the Thrunite Scorpion V2 and TN11.
oo: Firefly mode is as low as other Thrunite Firefly modes as well.Throw is consistent for a light this size, driven to these levels.
Output/Runtime Comparison:
First, a direct comparison of all Thrunite models on 1x18650
On 1x18650, my TN12 actually measures slightly higher than my Scorpion V2 and TN10, but is otherwise identical.
On 2x sources, the TN12 is driven about the same on Hi/Max as the Scorpion V2, TN10 and TN11.
This is likely to be a problem on 2xCR123A. On the Thrunite Scorpion V2, most primary CR123A cells tripped their built-in PTC resistors during sustained runs at comparable drive levels, even with external cooling applied (see a detailed discussion here). That light didn't have a circuit step-down feature, so the most likely explanation was that the CR123A battery built-in safety PTC resistors were engaging (to limit the current, and thus lower the output and heat). Note that different brands of CR123As have different chemistries/sensitivities, as discussed in that battery thread. Thrunite informs me that the TN12 has a thermal protection feature designed to protect the circuit from excessive temperature (i.e. greater than 80 degress Celsius at the PCB). However, given that the CR123A runtimes in HKJ's TN12 testing look a lot like what we observed for the Scorpion V2, it seems likely that something similar could be going on here. The reason you don't see this in my runtimes above is that all my tests are done under a cooling fan, and I know from previous experience that the Titanium Innovations cells I use are slower to heat up and trip their PTCs than Duracell or Panasonic cells. That said, when I opened the light after the above Hi 2xCR123A test, both my Titanium Innovations cells had their labels completely ripped apart at the seams (!). :shakehead
Given the similar pattern being observed on extended 2xCR123A Hi runs here, it seems entirely possible that you could trip your CR123A's PTC resistors before the TN12 circuit thermal throttling engages. As such, I recommend you don't run the TN12 on Hi on 2xCR123A for longer than ~5 mins or so.
Potential Issues
The light is driven to extremely high levels on Max, which is a concern for 2xCR123A. Although the light has a built-in temperature sensor to throttle down and protect the circuit from excessive heat, it is possible that you may still trip the PTC safety circuits of your primary CR123A cells before that happens (see commentary above). I recommend you do NOT run the TN12 on Hi on 2xCR123A for longer than ~5 mins continuously.
Strobe mode is on the main sequence (i.e. need to cycle past it to get back to Firefly mode).
Preliminary Observations
The TN12 is a very strong offering in the compact 1x18650 space.
The build is small enough that you can easily store it in pocket or carry it on your belt, making it a good EDC or "backup" light. And the body is wide enough to accommodate protected 18650 cells (including newer higher-capacity flat-top cells, which work in the light). :thumbsup:
The slim-lined build has good ergonomics – including decent knurling for grip. Light can tailstanding (barely, better when clicked on). Tailstanding ridges may obstruct your thumb somewhat, but I still found it easy enough to activate.
Max output is extremely high on the light – output on 1x or 2x battery sources typically rivals the most heavily-driven lights in my collection.
oo: Overall efficiency is excellent at all levels, with a good balance of output levels (I like the inclusion of Firefly). Unfortunately, strobe is also in the main sequence.My main concern is with sustained runtime of 2xCR123A on the Max level, given the much lower mass of this light (i.e. reduced heatsinking). While the TN12 does have a thermal sensor to protect the circuit, it is possible that you may trip your CR123A's PTC circuits before that happens (see discussion above, after the runtime graphs). I would prefer an automatic (i.e. timed) current step-down feature in the circuit, as Thrunite has introduced in the TN10/TN11. :candle:
Beam pattern is smooth and reasonable for a general purpose light (i.e. acceptable throw for a light this size, although less spill than is common). Overall use and handling impressions are positive. As long as you are thoughtful about how long you leave it running on Max, the TN12 has a lot going for it.
REVIEWER'S NOTE: This model has been updated for 2014 with a new emitter, higher max output, and new dual-switch interface. The old model reviewed here has been discontinued. Please see my review of the currently shipping TN12-2014 model.
----
TN12 supplied by Thrunite for review.
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