Are you saying the light completely powers down when you go to turbo?
Or does turbo work?
You need to know what batteries you have and what power they are rated at. If you are not sure, tell us where you bought them and what model and maybe we can figure out what they are.
Also make sure all 4 drain down to the same level. The MF01 can run on only 2 cells so we want to make sure all 4 are working.
Don’t forget to order button tops. 
From off I click three times (go directly on turbo) and the MF01 fire a flash and goes off with light OFF. I need to loosen and thighten to light up the button. With one-click cycle, instead of TURBO the MF01 goes OFF with light OFF
I have bought the cells on sept 2017, from GB. I found my order and the description doesn’t mention about max Ampere discharge .
That sounds like their protection circuit is kicking in.
Those green GB cells have unknown protection circuitry. It might use a cheap pcb with a 3A limit which would be 12A 6A total and the MF01 draws more than that on turbo.
The MF01 does not recommend protected cells due to its high current needs.
It’s also possible that not all 4 cells are making contact. Verify that first. (It’s possible the protection circuitry is good for 5A, but only 2 cells are running the light)
Yes, I already triple-checked contacts and reversed cell holder more times but nothing… Anyway, I should receive the new SAMSUNG 30Q next week and I will confirm if it is a cell issue (I hope so…)
Thank you
MF01 is 2S2P, so with 3A limit you have 6A total. With a 5A protection you have 10A total, which is well below requirement; Lexel measured 16A for V1 Pre production sample [Review] Astrolux MF-01 4x18650 flashlight supplied by Banggood
Has anyone modded this light with XPL-HI or XPL-HD emitters? I think with some VCT6 cells and XPL emitters this light would be a monster (if the driver would allow it).
About 6 days ago I told them that I can’t solder the leds. I received an email saying I will receive a reply in 48 hours. 6 days later…nothing. Then I told them that I’ll write a very bad review on a popular forum if the issue doesn’t get resolved immediately. Received an email in 13 hours saying they have shipped the new head.
See, you just needed to wait one more day. #nopatience #Chinesetime
Lol. Just kidding
Nichia leds are known for the trade-off between nice high CRI neutral white and high output.
I measured about the same numbers on my Nichia MF-01 V2 end of last year. I wouldn’t have noticed since it’s bright as hell anyway… but was a bit disappointed of course. Since then i sent it to Lexel in Germany for a driver swap. Now Texas Ace driver with Narsil ramping - like the Q8. Last time i measured it was over 13K lumens of pure Nichia white - with added GITD tape under the optic. That was extra cost of course… but now it really shines as it should/could have.
I dont know. But I think you have to use a unregulated driver to tet extra output with this configuration.
Can the MF01 be run on two cells?
Yes, but power would be limited of course. You may not get turbo.
The battery carrier is 2S2P so it can use 2 or 4 cells.
mmmhhh….interesting! In the meanwhile I wait to receive new Samsugn 30Q cells, can I put 2x LG HG2 flat top to try more testing? If yes, in which configuration? :innocent:
Yes, you will have to try different combos. You have a 50/50 chance, so if your first try doesn’t work, move one of the batteries to the other slot. The batteries need to face opposite directions to put out 8v.
There is the risk of overheating / melting the springs with too hight current.
You will double the current which have to go over one springs compared to 4 batteries.
Ordered mine in XP-G3!
i have my mf01 driver replaced with narsilM from Lexel several weeks ago and i just did springs bypass and now it is making as much lumens (ceiling bounce) as my Haikelite MT09R which is at least a 14.5K lumens flashlight. just wondering Is it safe at this level for the Nichias?
I just received my modded MF01 219c with buck driver and spring bypasses on driver and battery carrier from Lexel. Ceiling bounced at immediate startup measured 1615 lux vs 1244 lux stock. For comparison, stock MT09R 4000k 80CRI measures 1640 lux and stock MT09R 5000k 70CRI measures 2170 lux. However, the MF01 lumens drop rapidly the moment you turn it on similar to the Emisar D4 whereas the MT09R can maintain lumens much steadier. I guess that is to be expected from the small size of the MF01 so temperature regulation kicks in right away. The beam on the MF01 is a large focused hotspot with very dim mild diffused spill whereas the MT09R has a slightly smaller hotspot but much larger spill for a much more practical beam pattern that I like more.
The tint on this one, which I ordered in February 20 is much rosier than the stock one I ordered in February 03 of this year. I like the rosy tint much better than greenish tint. Compared to Cree 3A tint, this is still not as rosy.
Overall I like this modded light much more than the stock MF01 and it is the only 10k+ lumen 90+ CRI light on the market. Lexel did a good job. I recommend his services.
Interested, 2nd batch