Coupon is valid again.
I finally got lexel’s TA narsil driver working and i must say it is nice . I bypassed all the springs on carrier and with a fresh set of vtc6’s got 15800 lumens with 15300 @30s.
15800 lumens with which LED’s?
Nichia 219c
Holy Moses! I too have one of his drivers and have yet to solder it up. Looking forward to seeing all that light for myself.
Spring on driver wasn’t doing right so i changed it to one of those like in a d4. Ihad to scrape off some mask to get it to fit.I got 16900 at turn on.
Nice, a ~5K jump with that driver with 219C like I have. Thanks for doing this.
I did it too. Light output is brutal. Heat huge … :smiling_imp: Springs in the carrier warmed and lost contact … 
I thought maybe it was messing up my light box so i did a ceiling bounce before driver it got 1014lumens after 1635 lumens.
Hi guys! I have a question about my MF01 V1. On a turbo mode, one group of LEDs does not work. On fully charged batteries, everything is OK. But as soon as the voltage on them falls to 3.5 volts, then in turbo mode one group of LEDs does not shine. This problem was initially, as soon as I received a flashlight from Banggood. What do you think about it?
^The 3.5V is the resting voltage of the batteries, or the voltage under load?
If it is the resting voltage, then the voltage under load may already be under 3V, and then the LVP (low voltage protection) may have kicked in. As the driver is clearly divided in three sections, each driving 6 leds, the LVP may also be implemented for each section individually. Since the voltage readout of flashlight drivers is usually not very precise, one group may have shut-down already while the other two groups have a bit lower voltage threshold and may kick in later. This delay will be a bit extended even because one group already shut off, decreasing the battery load so that the battery voltage goes up somewhat again.
(I’m not a MF-01 owner btw)
3.5-3.6V - resting voltage of the batteries
I wrote in support of Banggood, and here’s what they said to me:
“we are so sorry we are not sure if this problem was caused by the man-made damage”
Strange support, however.
Thanks for the answer, djozz
All problems since Adam and Eve are man-made damage.
What batteries you’re using?
What is the status of breathing light on turbo? Red? Red blinking?
New 4*Sony VTC6 , оr new 4*Samsung Q30, or 4*LG HG2 - same result
Red
That is your issue, there is nothing wrong with the light. 3.5v is practically a dead battery. Under load it’s probably dropping to 2.8v. I’m surprised turbo would even turn on.
Using HKJ’s comparator @10A for 30Q and VTC6 results in about 3.2V~3.3V with 3.5V resting voltage. I’m not familiar with driver designs, but my guess is that LVP is built in the controller, so either all three drivers work, or all three quit, as the voltage is below a specific value.
My explanation was just a guess based on the symptom, if there’s just one MCU in this driver it makes no sense. 
Of course. What I wrote is also a guess. I have noticed that other people’s guesses in general lead to thinking about what exactly might be going on; and this eventually helps in better understanding what is happening inside a flashlight.
Does anyone else’s V1 light do this when the cells are at 3.5v and turbo is activated?
That should determine if it’s just his light or all of them.