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  • TN42 runs on 4 x 18650 (ThruNite 18650 3200Mah).
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TN42 LED Searchlight


Product Description


  • One of the most powerful throw LED lights on the market.
  • Uses one advanced CREE XHP35 HI LEDs with a lifespan of 20 years
  • The high output reaches 2000 lumens and an ultra-long distance of 1550 meters. 
  • ThruNite ITC technology to prevents possible damage from overheating.
  • Reversed polarity protection system prevents damage to the light.
  • Intelligent and ergonomic user-friendly interface.
  • Only applicable for 18650 batteries to use.


  • LED: 1xCREE XHP35 HI LED with a lifespan of 20+ years of run time.
  • Runs on:  18650 (ThruNite 18650 3200Mah).
  • Working voltage: 5.5V-8.4V.
  • Output & Runtime (Tested with four pieces ThruNite Li-ion 18650 batteries (3.6V/3400mAh) and for CW. NW parameters is 10% off):
    • Strobe(680 lumens /10.8hrs),
    • Turbo(2000 lumens/1.5hrs),
    • High(780 lumens /5.3hrs),
    • Medium(256 lumens /17.8hrs),
    • Low(38 lumens /4.3days),
    • Firefly (0.8 lumens /58days).
  • Peak beam intensity: 600750cd.
  • Max beam distance: 1550m.
  • Waterproof to IPX-8 Standard (2 meters).
  • Impact resistant: 1.0 meter.
  • Working Temperature: -40℃-40℃.
  • Dimensions: 206mm (length) x 100mm x 52mm.
  • Weight: 666g (including battery carrier).
  • Accessories: Shoulder strap*1, Strap ring*1, A, Spare O-ring*2, Side switch Cap*1, Battery Carrier x1 (inside the flashlight).


  • Turn On/Off 
    Press the side switch to turn the light on/off.
  • Change Mode
    • When the light is on, long press the side switch to cycle through low, medium and high.
    • Shortcut to firefly: When the light is off, long press the side switch to get firefly mode.
    • Double click to turn to turbo from any mode. Another double click to get strobe.
  • ITC Technology
    The light will automatically lower the current when temperature in LED or driver rises to 80 degrees centigrade to protect the flashlight from overheating. 
    Thus to extend its lifespan.
  • Memory Function
    The light will turn on in the last mode accessed, except firefly, turbo and strobe. 
  • Low Voltage Indication
    When the indicating light on the side switch turns from blue to red, it means the battery package should be replaced or charged.
  • Battery Replacement:
    Take off the tail cap, insert four 18650 batteries into the battery carrier, put the carrier into the flashlight and screw on the tail cap. With either end of the battery carrier towards the light head is OK. But make sure the batteries are correctly inserted into the carrier with polarities matched (springs on the carrier should connect with the cathodes of batteries).

Product Reviews

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Showing reviews 1-15 of 34 | Next

  1. Great item! 5 Star Review

    Posted by on 22nd Jan 2018

    To be recommended!

  2. Very impressive light 5 Star Review

    Posted by on 21st Dec 2017

    This is a very impressive light!
    But of course it is not suited as a general purpose or every-day-carry light as the light is almost pure throw, with very little flood.
    It has great range and my example in neutral white has a beautiful color tint.
    I was very impressed by how good the throw is, even in firefly mode.
    I simply love the one button userinterface, as it is simple and well setup.
    Easy access to firefly, turbo or the three main modes low medium and high.
    If only other manufacturers would use the same UI :D

  3. Delivers on its promise 4 Star Review

    Posted by on 6th Dec 2017

    Must be toward the highest power spot lights out there. This is primarily a long-throw, highly focused, spot beam. Very little flare along the beam. There is a "local" evenly lit but weak area of light useful for avoiding tripping that is sharply cut off at the edges. There was an incorrect assembly in the battery holder that prevented filling the cartridge but the error was obvious and a miniature screwdriver allowed a repair to correct the problem. Battery life seems as advertised.

  4. Najlepszy szperacz 5 Star Review

    Posted by on 3rd Dec 2017

    Nie ma co owijać w bawełne, to obecnie najlepszy szperacz dostepny na rynku. Doskonały zasięg, świetne wykonanie, przyjazny UI. Do tego doskonała obsługa: szybka wysyłka, a także komfort w razie ewentualnych problemów. Pełny profesjonalizm.

  5. super long throw flashlight 5 Star Review

    Posted by on 13th Sep 2017

    Love this bright light saber like flashlight. The xhp led bulb is amazingly bright. The button is even lighted when it's on and that makes it feel up-to-date. The carry strap comes handy and the included spare parts was an icing in the cake. Love it and many thanks Thrunite.

  6. Amazing reach. 5 Star Review

    Posted by on 7th Sep 2017

    My review on Polish forum:,62726.0.html

  7. Fantastic light 5 Star Review

    Posted by on 1st Aug 2017

    This is an amazing light, from when you open the box, and you find the light coddled in the unusually silky, perhaps silicone like bag, to when you unscrew the back - and you realize how fantastically well made it is.

    Put in 4 batteries, the battery cartridge is rugged and well made, and reversible, turn it on, and shine it, and you get to see just how perfect that reflector is.

    The throw on this light is insane, if you live on a farm, you want one of these. Highly recommended.

  8. Great Searchlight 5 Star Review

    Posted by on 29th Jun 2017

    Super throw, excellent quality, completely satisfied.

  9. Amazing throw 5 Star Review

    Posted by on 29th May 2017

    Although the highly focused throw of this light limits its use, if you need the distance, there's nothing like it.

  10. Awesome for maritime use. 5 Star Review

    Posted by on 10th May 2017

    I use this light for boating. It throws a narrow beam of light a very very long way. When you are looking for a reflective ATN (Aid to Navigation), this light can really find them from far off. The light output is so intense that you can't let if reflect off anything close (like to boat or it's metal rigging) or else the reflected light will overpower your vision. An awesome light, the best I have yet used by a large margin.

    I've also found that having the control button just behind the strap attachment allows me to find the button one-handed. A nice feature for me.

  11. Its the best light for me 4 Star Review

    Posted by on 10th May 2017

    Its a powerfull light.when you searching a distance light by these. And you have the best

  12. Heck yeah 5 Star Review

    Posted by on 7th May 2017

    Easily lights up the distant critters in the valley across the way. The distance and power behind this thing is truly incredible. Believe the hype, it's for real. No scratching issues with mine as others have reported. Top notch! My fourth Thrunite light, I do believe I'm hooked...

  13. Great construction but waiting on batteries 5 Star Review

    Posted by on 2nd May 2017

    Looks Badass! But I'm still waiting on the batteries so I can turn it on!

  14. Too Expensive 3 Star Review

    Posted by on 29th Apr 2017

    Scratches too easily compared to my Fenix flashlights. Performance is as advertised but way TOO expensive. Last Thrunite product I will purchase. I'm a very dissatisfied customer.

  15. Great Light! 5 Star Review

    Posted by on 23rd Apr 2017

    The light is great, and unlike the TN40, the light stays much cooler. The only down-fall is the black finish on the light. It easily cracks and peels off from a simple slide on top of a table. The lights in Thrunites line need a BETTER finish. Also, the base clip for the strap scratches up the but of the light and exposes raw silver aluminum. Need a non-metal connector against the light instead of metal to metal.

Showing reviews 1-15 of 34 | Next