What you guys think is the maximum wattage to be dissipated on a 105C/D style stacked driver (not potted)? I’m currently building a triple 219C R9050 EE X6, have 16 AMC7135 installed on a 105D driver (running BLF-A6). With the low forward voltage of these 219C’s I have a feeling that’s a bit much power to dissipate at the driver, about 5.8 W in the worst case (fully charged high drain 18650).
This is not good 
put on board so many of AMC.
better to put a quality FET for DD
Well with a FET the excess voltage gets burned in the LEDs, right? Maybe the driver will stay a lot cooler, but the 219C’s will run nuclear in no time.
Some M22 moddings
wow you have so many M22
Im yet to own one 
Well, it will be the Olight modding month dude( at least for me)
That is some flashlight capital you have there Mitko, what is the mod? I notice that one reflector has a different finish :nerd_face:
@chouster: you can get the driver dissipate the heat of those 12 chips if you have a plan where it goes. What I do is for each stack connect the large lips of the chips facing the outside of the driver with a generous amount of solder (solder is a pretty good heat conductor!), and let that blob end right where the driver’s ground ring is clamped to the pill/body/retaining ring.
And I think that I remember that 7135 chips have an internal heat management and drop their current if they get too hot. Anybody confirm this?
M22 will be dedomed /w fet driver, the result is like 1700lumens and 90k cds, its some kind of a luxury X6 of some sort, the beam profile is virtualy the same yet the heat disipation/the host is ways better
M2X will be modded the same way, the result is 250k cds
M3X i apply only a modest driver mod( 5.5 amps at the emitter) and i pot/ heatsink the driver, its kind of a fragile one( from experience), several ot those M3X will be XPG2 moded ofc
Yeah thats the result of a EU Black friday
Party has started 
The solder connections on the big ground tabs is what I did. I’ve read that about the AMC7135, someone confirmed this by testing but I can’t remember who it was. Problem with that is, there are many sources for those AMC7135 chips and we don’t know if every chip acts that way.
I am having the same problem in a triple 219C with the genuine Mountain driver. Will have to try this when I get time.
What did you use for a spacer?
Astrolux SC quad :
Spacer from kiriba-ru , Carclo 10622 optic , Nichia 219C 4000K CRI 90+ D240 leds and old dsche copper quad mcpcb .
Stock driver , with bypassed spring . Also added the second LED & Resistor in the tailcap PCB . Leds on mcpcb is soldered on the spacer and spacer inside the head too .
Unfortunately i don’t took pictures during the mod , i had my phone for repair .
But here are the results :
Pulls 12 Amps from the little Efest 14500 V2 650mAh :heart_eyes:
Edit 4/24 : Pictures fixed
I roughly cut two discs from a 3mm copper plate that I have. I then solder them together and drill a hole in the middle.
You modified the Blf-A6, a FET+1 firmware?
I’m running a S2+ with 3x 219C and FET+1 (modified Blf-X6-driver) as EDC, of course it gets hot fast in turbo, but with a “not-too-high”-drain cell like Sanyo 18650GA its really usable.
I noticed this behaviour with a 105D.
Yupp, but nothing major. To add the OTC I changed the OTC pin to be the one next to the GND pin, so that I can solder it across those two pins. Also brought Battcheck_VpT to this firmware a while ago.
I built this zener modded FET driver, using an Attiny13 from an old 105C type of driver (one without stars, mode group with/without blinkies sekected after a flash in low mode).
Long story short: I first tried to zener-mod (swapped the diode for a 220 Ohm resistor and soldered the zener parallel to C1) the BLF-A6 driver, zener-mod worked but the user interface was messed-up bigtime, then teied to zenermod a AK-47C but it did not work, probably because the circuitry is a bit different from the 105C. So for the third attempt I built the driver from the picture because I built that one before and it works, except that the low voltage warning kicks in at 3.5V.
I used this driver together with a (my only) Nichia 144A SM453 in a S8 type host, modded the tail section a bit to accomodate 2x 18350 batteries. The mod was succesful, got a bright working light!
I hoped for 3A but the voltage of the 144A is so low that on those two little cells it drawed 5.8A, way too much for this led on the non-DTP board, the output was way over max.
Before something went wrong I made these shots, first a lens projection of the die, then a beamshot from 2.5 meter to the wall. As can be seen the die looks fairly ok (much less ‘spiegelei’ like some of the earlier samples), but the beam from the small OP reflector still has an unpleasant yellow hotspot. The perhaps bright side is: a distinct spot without donut hole.
I had to take the pictures on high setting to avoid pwm effects, and the 30 seconds on near 6A appeared too much, the led got too hot and died
Exit 144A led, I was too careless. I will save this host+driver for a XHP50.2
There they are, not easy editing on a phone underway in the train
Thank you!