Putting my Nichia on high mode as I am typing this reply… and playing with it for almost 5 minutes at this very moment of typing… and the light is feeling warm but not even close to hot or anywhere near for it to step down yet… now another minutes just passed…. still remaining the same output to my eyes.
Not sure why I’m taking almost 10 minutes to type this reply but now I know that high mode is running very efficiently lol
I got this nichia version yesterday and noticed that one of the led won’t turn off even though it’s very very dim, maybe below 1 lumen…
Anyone has the same problem?
Maybe LED not properly reflow. 
Able to take a peek under its TIR optics?
No, I’m afraid I’m not able to do that kind of thing 
You have true moonlight mode ! 
though it is strange that only one LED is on. Is the breathing light pulsing (‘off’)?…
By the way, I suppose this light would be a perfect candidate for ‘BLF edition’. Add some cooling fins, maybe a little more metal on LED shelf, better driver… it would be a total killer.
Don’t get me wrong, it is still a great light. Assuming it isn’t faulty (I had bad luck ;/). However it surely can be better.
How is that even possible that 1 led is on when they are connected in a cluster of 6 LEDs?
Bad reflown so the - is connected to the DTP spot while the + is still connected?
Like the emitter is twisted or moved from the right spot?
Or to much solder paste and the led didn’t get the tap on the head to remove excess solder so DTP spot and - is connected?
The Mcpcb does have DTP right?
Do not worry, every bad luck comes to an end. 
Well, I had a reply from BG 5 days ago:
I can’t see it in ‘my orders’ yet.
I also sent a replacement for the torn rubber button, the method of delivery Flat Express.
1 * Astrolux MF01 Swicth Cover
But keep in mind that he will not appear in the list of orders and you personal cabinet.
Sitting here with my Nichia doing tail-stand on high mode… because I got nothing better to do… it’s been 30 mins and I don’t see any noticeable step down to my eyes. The head is warm but still able to hold with my hand. The body is also warm but nowhere near as the temperature on the head. No fans or anything to cool it down.
The light kept on running in high mode and just about 35mins I saw some “flickering” but that only dims a little bit…barely noticeable tbh. Then I got bored… I hit the button one more time and go turbo, the light heats up quickly and saw a noticeable step-down. After I shut it off, the light cools off fairly quickly and I can go turbo again. I am very happy with this product, the high mode runs pretty well and efficient with no cooling at all; out door will definitely do much better in the cool weather.
All 4 battery reads 3.92V when I put them into the charger. Pretty good after running on high + turbo mod for about 35-40 minutes.
Astrolux MF01 even in the active cooling mode does not work in the turbo for more than 1 minute. AceBeam does not have such a problem, with strong active cooling, the turbo mode works long. :weary:
“Astrolux MF-01 active cooling mode” you mean a fan outside of the light ? 
Anyway , not really fair comparing a 70$ and a 500$? flashlight.
Cooling the head with liquid nitrogen!
Which AceBeam model are you referring to? 
Not 500 $ and 299 $ - AceBeam X80
AceBeam X80 at least 3 minutes shines at 11000lmn
I think you are referring to thermal regulation... Active cooling does not exist in any of lights. From Maiden666's review https://budgetlightforum.com/t/-/47092 you could see X80 is above 50°C @1min which Astrolux MF-01 is not programmed to go beyond this mark. To be honest, 70°C in 2min is pretty insane. 
He means external active cooling. Like fan or big water volume. That shows difference between real thermal regulation and programmed step-down.
Yes, yes, you’re right! I’m talking about this. They do not understand me …