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Thread: Review of ThruNite TN31 with measurements and outdoor beamshots

  1. #1
    HKJ's Avatar
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    Default Review of ThruNite TN31 with measurements and outdoor beamshots

    ThruNite TN31




    ThruNite has made many lights, this is their biggest thrower light to date. It has a XM-L led and uses a magnetic ring for mode selection and standby, on/off is controlled with a tail switch.
    The light is made of aluminum with hard anodized (Type 3) finish.
    This light is very close in design to TN30 that uses 3 leds.

    I got the light without any accessories.



    The light uses a large smooth reflector with a XM-L led.



    The head designed includes a some heat sink fins.



    Just below the heat sink part is the ring to control the light. The ring turns smoothly and has good clicks.





    The light has six brightness settings, standby and strobe on the ring.



    The backside of the head has a spring for connection to the battery carrier.



    The battery tube has triangular threads with anodizing and a O-ring to seal the connection.



    The knurling has some bite to it.



    The tail has not one, but two springs. This is because the light has an electronic switch. This electronic switch reduces the wear on the mechanical switch, and the price is an insignificant current draw (20uA-50uA).
    The switch is a forward switch, i.e. press it half way down for momentary on.



    The light uses a battery carrier, that holds 3 18650 batteries in series. The carrier can handle batteries up to 70 mm long, but the fattest batteries are a very tight fit (See my battery size measurements).



    It has a small metal plate on the plus contact, i.e. it can use flattop batteries



    The carrier is symmetric, i.e. it can be used both ways in the light.



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



    A look at the led.



    This light is a great thrower and has enough spill to make it generally useful. The ring interface makes it easy and fast to select brightness. With the 3 batteries is does also have a good runtime.



    Technical specification and measurements



    The light is rated for use with 3 18650 LiIon batteries.

    Measured size and weight:
    Length: 205 mm
    Diameter: 49 mm to 79 mm
    Weight: 713 gram with 3xIO18650-31

    The light uses a a Cree XM-L U2 led.



    In the above table I have collected all modes. The current is measured at 11.1 volt. All the estimated runtimes are with a 3100mAh LiIon battery.



    The first voltage sweep is done in high mode. Because the light one has one led it works down to a very low voltage. To find the battery that gives longest runtime on full brightness, check my battery comparison and find the longest cyan bar in the 2.8 volt chart.
    The drop at about 7.7 volt is probably the step down to reduced brightness.



    The light reduces brightess slightly after about 1˝ minute.






    There is no surprise in the lower brightness settings, they uses less power and has less brightness. They do also stabilize the light at a lower voltage. All the drops in the light is the battery low warning.
    Because this light uses on a single led it can produce full brightness down to about 4 volt. That would be very damaging to unprotected batteries, i.e. when the low voltage warning starts flashing, it is time to turn the light off!



    To get a more precise threshold for the battery low warning I did a much slower voltage sweep and it looks like it starts at about 8.2 volt or 2.73 volt for each battery. This is a good voltage for a battery warning, depending on actual LiIon battery chemistry the minimum voltage is somewhere between 2.5 and 3 volt.



    When doing the runtime it can be seen that the light reduces the brightness after about 1˝ minutes.



    The strobe is a "random" strobe, with 6.8 hz and 14.5 hz



    The turn on in the strobe is a bit slow, but not anything visible.



    The light is current controlled, but has some high frequence noise, on the #2 setting it is at 21 kHz. There is noise on any level, but always at a very high frequency.



    Comparison to other Flashlights

    ThruNite TN30, ThruNite TN31, ThruNite Scorpion V2 with turbo head:


    Fenix TK70, Klarus XT20, NiteCore TM11:



    For the full comparison to other lights with graphs and beamshots see here




    Notes

    The light was supplied by ThruNite for review.
    My website with flashlight, battery and charger information: lygte-info.
    More than 200 battery reviews and 80 charger reviews.
    Compare 18650 LiIon batteries or smaller (RCR123, 16340, 14500, 10450) LiIon batteries.

  2. #2
    Flashaholic* candle lamp's Avatar
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    Default Re: Review of ThruNite TN31 with measurements and outdoor beamshots

    Excellent review as always. Henrik!
    Many thanks for your time & efforts.

    The high output is 1147 ANSI lumens manufacturer claims and it's amazing. According to the Cree data, XM-L U2 LED lumen at 3.0A current is 976 lumens.
    So the ampere at 1147 lumens is much higher than 3.
    Fortunately the light reduces the brightness after about 1˝ minutes in the runtime graph. Is it due to LED temperature increase or due to step down regulation?

    KyeongHo
    Latest Review : Rayus PT10S Review

  3. #3
    HKJ's Avatar
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    Default Re: Review of ThruNite TN31 with measurements and outdoor beamshots

    Quote Originally Posted by candle lamp View Post
    The high output is 1147 ANSI lumens manufacturer claims and it's amazing. According to the Cree data, XM-L U2 LED lumen at 3.0A current is 976 lumens.
    So the ampere at 1147 lumens is much higher than 3.
    If you look at the current curves, you will see they peak at around 3.7 ampere, i.e. the led current is probably close to that (and that is after the current is reduced).

    Quote Originally Posted by candle lamp View Post
    Fortunately the light reduces the brightness after about 1˝ minutes in the runtime graph. Is it due to LED temperature increase or due to step down regulation?
    It looks like it is on time.
    My website with flashlight, battery and charger information: lygte-info.
    More than 200 battery reviews and 80 charger reviews.
    Compare 18650 LiIon batteries or smaller (RCR123, 16340, 14500, 10450) LiIon batteries.

  4. #4
    Flashaholic* candle lamp's Avatar
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    Default Re: Review of ThruNite TN31 with measurements and outdoor beamshots

    Thanks for your reply.
    Latest Review : Rayus PT10S Review

  5. #5
    Flashaholic* csshih's Avatar
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    Default Re: Review of ThruNite TN31 with measurements and outdoor beamshots

    great review HKJ!

    Craig

  6. #6

    Default Re: Review of ThruNite TN31 with measurements and outdoor beamshots

    Nice, another one added to the list. Thanks HKJ for great review!

  7. #7
    Flashaholic* yifu's Avatar
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    Default Re: Review of ThruNite TN31 with measurements and outdoor beamshots

    The throw is pretty remarkable for a XML based reflector light. However, the body tube is way too wide for me, there's no reason not to use a 2 18650 tube instead.

  8. #8
    HKJ's Avatar
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    Default Re: Review of ThruNite TN31 with measurements and outdoor beamshots

    Quote Originally Posted by yifu View Post
    The throw is pretty remarkable for a XML based reflector light. However, the body tube is way too wide for me, there's no reason not to use a 2 18650 tube instead.
    That probably depends on the size of your hand, for me the body has a good size.
    My website with flashlight, battery and charger information: lygte-info.
    More than 200 battery reviews and 80 charger reviews.
    Compare 18650 LiIon batteries or smaller (RCR123, 16340, 14500, 10450) LiIon batteries.

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    HKJ's Avatar
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    Default Re: Review of ThruNite TN31 with measurements and outdoor beamshots

    Quote Originally Posted by yifu View Post
    The throw is pretty remarkable for a XML based reflector light. However, the body tube is way too wide for me, there's no reason not to use a 2 18650 tube instead.
    That probably depends on the size of your hand, for me the body has a good size.
    My website with flashlight, battery and charger information: lygte-info.
    More than 200 battery reviews and 80 charger reviews.
    Compare 18650 LiIon batteries or smaller (RCR123, 16340, 14500, 10450) LiIon batteries.

  10. #10

    Default Re: Review of ThruNite TN31 with measurements and outdoor beamshots

    Thank you HKJ!

  11. #11

    Default Re: Review of ThruNite TN31 with measurements and outdoor beamshots

    I noticed at the start of your review that your light come without accessories.....could you elaborate on what the accessories are for the TN31?

    thanks,
    Ken

  12. #12
    HKJ's Avatar
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    Default Re: Review of ThruNite TN31 with measurements and outdoor beamshots

    Quote Originally Posted by Ken2step View Post
    I noticed at the start of your review that your light come without accessories.....could you elaborate on what the accessories are for the TN31?
    I would guess that it is the same accessories as the TN30. Thrunite did say that it included an aluminium case, but the size must be slightly different than the TN30, because the TN31 has a larger head.
    My website with flashlight, battery and charger information: lygte-info.
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    Default Re: Review of ThruNite TN31 with measurements and outdoor beamshots

    Great review HKJ. I understand the parasitic drain on standby, but was that with tailcap switch on or off? Does the assisted tailcap switch itself create a parasitic drain ? IE; with the light on standby and the switch in the off posn. is there still a drain happening other than the batteries natural loss over time ?
    Many thanks and best regards;
    Mike.

  14. #14
    HKJ's Avatar
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    Default Re: Review of ThruNite TN31 with measurements and outdoor beamshots

    Quote Originally Posted by harro View Post
    Great review HKJ. I understand the parasitic drain on standby, but was that with tailcap switch on or off? Does the assisted tailcap switch itself create a parasitic drain ? IE; with the light on standby and the switch in the off posn. is there still a drain happening other than the batteries natural loss over time ?
    Many thanks and best regards;
    Mike.
    The tailcap does have a small current drain, I do mention it when I describe the switch, it is in the range 20-50uA.
    My website with flashlight, battery and charger information: lygte-info.
    More than 200 battery reviews and 80 charger reviews.
    Compare 18650 LiIon batteries or smaller (RCR123, 16340, 14500, 10450) LiIon batteries.

  15. #15
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    Default Re: Review of ThruNite TN31 with measurements and outdoor beamshots

    Quote Originally Posted by HKJ View Post
    The tailcap does have a small current drain, I do mention it when I describe the switch, it is in the range 20-50uA.
    Ahh, thanks HKJ. I did miss it, oh well!!

  16. #16
    Unenlightened Interhead's Avatar
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    Default Re: Review of ThruNite TN31 with measurements and outdoor beamshots

    Great review.. Incredible light. The range and brightness is extreme. Very nice narrow white beam with minimal spill. My favoritte thrower vs size for the moment.
    Last edited by Interhead; 12-07-2012 at 02:26 PM.
    Olight:SR95UT ThruNite:T10,Catapult V3,TN31Led Lenser:K2,L7,H7,P14,M14X, X21(rebuilding) Nitecore:EA4, Conquedor Recoil MX-008 From China: Skyray:XY-600. Several Ultrafire,Paillde Recoil, 85W HID Xenon

  17. #17
    Flashaholic ThrowerLover's Avatar
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    Default Re: Review of ThruNite TN31 with measurements and outdoor beamshots

    Great review. I'm curious - are there filter lenses or diffusers produced for this model?

  18. #18

    Default Re: Review of ThruNite TN31 with measurements and outdoor beamshots

    Quote Originally Posted by ThrowerLover View Post
    Great review. I'm curious - are there filter lenses or diffusers produced for this model?
    You can use the Olight ones for the SR90 I believe.

  19. #19
    Flashaholic holylight's Avatar
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    Default Re: Review of ThruNite TN31 with measurements and outdoor beamshots

    good review as usual. tyvm
    lights: saber1a, v11r, sc52, sc600ii, ea4, tn31, archer1a.



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