That doesn't work 
and, I have two Q8's!
robo, your Thrunite cell seems to be wet inside the wrapper, you should probably check into that and possibly set that cell aside as questionable. 
looks like a great compact light, and i have always had solid experience using ThruNite products. would anyone possibly know if this will be available in a Neutral White ? i only see a cool white version listed on the ThruNite webstore ....and seems like it is no longer even available for purchase on their webstore until April 15 2018 (not available on Amazon or ebay either) ?? Can one still use the discount code to pre-order ?? thanks all !
If you use their drop down menu where you see CW you will also see the option for NW http://www.thrunite.com/thrunite-tc20-3800-lumen-flashlight/
I used the discount code and it still worked directly on thrunites website.
thanks kirman, that info was most helpful, much appreciated !! think i shall get me 1 or maybe 2 :)
Well, I could not stand it 
Ordered and waiting impatiently for the courier.
Anytime! I'm still waiting for mine. Tracking says it will be here tomorrow or Tuesday. I get a feeling it will be my new favorite light to carry everywhere.
Got my CW today and it's a nice solid little light. I can't seem to tell the difference between 1800 lumens and 3800 lumens though. Normally based on my other lights, I should still notice a 2000 lumens jump between 2-4k lumens. I'll try it outside tonight as I have only been doing the ceiling bounce in a dark room so far.
I got the CW and it is has a very heavy green tint on all levels. I'm not convinced my TC20 is 3800 lumens though as I have a Nitecore EA21 and it gets 2150 lumens and when I point it at the mirror and have the reflector look back at me, it is far brighter than the TC20 at 3800 lumens.
Update: I see the problem. I tightened the head as was suggested with this light, and it will go on turbo for about 1/10th of a second and then step down again so I think I have a faulty one. I just found another problem. 1/4 of the emitter is not working at all. I seem to be on a roll with faulty emitters lately.
Turn your battery tube around.
Non anodized threads go to the tail end … seems some of them have been put together backwards from the factory.
Thanks. Just checked, my battery tube is correct. The 1/4 section of the led is ok on the higher modes so it just won't stay in turbo for some reason.
What cell are you using? Sounds like a protection circuit kicking it down when asked to supply too much power…
The one that came with the flashlight. I'm just charging my protected Keeppower and will give that a try in an hour or so when it is charged.
I may be misunderstanding what you are saying here but ……………
Are you saying that 1/4 of the LED is NOT working in some modes?
Yes, on firefly and low mode, 1/4 of the led is not working at all.
Something is wrong with the LED itself then……should all be working in all modes.
This is mine in Moon………
Your led looks fine. I borrowed my wife's camera and not sure how to use it, but here is my pic of the led.
I put a green filter in front of it to make it easier to take a pic of as her camera is iffy.
Yea definitely something wrong there with that emitter.
Yes… there is something wrong with your led… this is not new… i seem xhp70.2 and xhp70 diffuse dome light up half led… so your led is defective… time to exchange!
Thought so. This is my second flashlight with a faulty led. My DX80 has the same problem but only half of one led is dark.
I just sent an email to Thrunite and will see what they say. I ordered this light through their website and it came today here in
Canada from Amazon.
I think they will make it right without much problem , but don’t hold me to that though because I HAVE been wrong before….lol
Hate to see anyone get a faulty light , but at the same time I don’t know of any of the companies that have a perfect track record with quality control yet.