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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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  1. Great Searchlight 5 Star Review

    Posted by on 29th Jun 2017

    Super throw, excellent quality, completely satisfied.

  2. 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.

  3. 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.

  4. 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

  5. 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...

  6. 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!

  7. 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.

  8. 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.

  9. TN42 5 Star Review

    Posted by on 21st Apr 2017

    Diese Lampe hat ordendlich Reichweite,
    und ist gut verarbeitet.
    Da immer zwei der vier Zellen parallel betrieben werden,
    ist der Betrieb auch mit zwei Zellen möglich.

  10. Great flashlight 5 Star Review

    Posted by on 23rd Jan 2017

    Wow, it throws a mile (literally) and is super dependable. If you want the best handheld thrower money can buy, this is it.

  11. TN42 NW, extreme distance throw, aestethics scratches. 3 Star Review

    Posted by on 20th Jan 2017

    Torch ordered from the official website of the manufacturer, in the period of Christmas sales and arrived by courier balances in 2 days only.
    flawless performance, incredible intensity of the spot (640,000 candles) and tint in my version Neutral White NW, very beautiful with white coloring cream on 5000 K. It is not a minor thing to find a flashlight beam well cared for both geometrically and tint.
    The abundant size does not make it too heavy, however, so it is rather handy, even more so if you wear the practice shoulder strap, which allows you to walk having the torch always available at your side.
    Coming to the less pleasant notes (in a torch from the premium price): When I opened the box, I noticed small signs both outside and inside on the anodization.
    As in attached photos I tried to show the scratches, in my opinion I do not think they result from the a imperfect quality control, but I imagine are due to the fact that this flashlight is a case of reconditioned product, the result of a return for unknown reasons by a user (I find deplorable abuse of rendered services that are offered there) that before making it ruined it for his uncarelessness. At this point is the failure to control by ThruNite to ensure a quality standard appropriate to the next client.
    I note: a small abrasion in the coupling edge head-parable, an abrasion on the inside of the head, many scratches in the metal that makes contact between + and - pole of the battery carrier, but the worst thing, the end the threaded portion of the torch body is slightly bent, as if it was narrowed with a small grain of sand or other impurities. This could impact on the waterproof level of the flashlight features.
    By writing to the customer service I was simply told that these imperfections are the result of the production process, that of quality and delivery control. I felt slightly teased, inadequate customer service in my opinion, as well as quality control.
    For the rest, truly phenomenal torch!

  12. Amazing 5 Star Review

    Posted by on 19th Jan 2017

    This light is amazing it's the brightest flashlight I have ever seen. The best part is the beam is narrow it just cuts through the dark. Seen the review on Viking preparedness. As Mr. Fox said it's a light cannon

  13. This light is AWESOME! 5 Star Review

    Posted by on 19th Jan 2017

    There isn't really much more to say past the title. However, I would like to say that I live in a rural area; so, I was able to actually test the claimed throw of this light. This light lit up a white water tower at 1550 meters away!!! The next leading competitor on the market was unable to do this. In plain english, TN42 > K70. Love this super thrower!!!

  14. AMAZING 5 Star Review

    Posted by on 10th Jan 2017

    Simply put this is a first class amazing flashlight. Its high grade materials combined with best LED technology producing incredible distance as a throw flashlight. You can not find anything better than this for distance, quality and fit and finish. Only thing you need to know is it does NOT come with batteries so you must purchase batteries in addition. You will not be disappointed.I also have a TN 40 which is an amazing flashlight as well just less distance and more flood to it.

  15. Great light 5 Star Review

    Posted by on 5th Jan 2017

    Lit up a white location marker on an peninsula over a lake
    I guess it was a 1/2 mile or better away, the light wasn't
    even on turbo. Aimed at the sky on turbo and it reminded
    me of the military search lights from the fifties and sixteys.
    This is my first real flashlight.

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