Convoy M1 + MT-G2 + 2 16340 IMR == crazy

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bdiddle
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Convoy M1 + MT-G2 + 2 16340 IMR == crazy

So I have been trying to fit this MT-G2 into a flashlight and was having trouble with both reflectors and drivers.

Turns out the Convoy M1’s reflector works perfectly with an MT-G2. Contact board for driver and two Efest IMR’s.

I think its pulling 6 amps with the fully charged batteries. The MT-G2 inn an X8 clone with a 3 amp driver I was getting 180 lux ceiling bounce.

With this M1 direct drive it gets 300 at start. My modded 9 XML Trustfire does 450.

Now, I want to swap the contact board for a 105c, all I need is to add a zeiner diode right? I tried searching for the thread that shows what is needed but can’t find it. Anyone care to point it out to me?

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DB Custom
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You need to put an 200 ohm resistor in place of the reverse polarity diode at the base of the red positive to led wire on the driver, on the other side, you need to put a 4.3V Zener on top of the capacitor next to the 7135 chip, with markation line away from negative ring.

resistor by the red wire
DBC_August 01, 2013_123502-2

Zener on the capacitor, I have found it lays beside it more cleanly than it stacks on top of it
DBC_August 01, 2013_123342-2

Mouser has these for cheap. I bought ten of each for like $6..

And of course you can then stack your chips to the desired power level up to what your cells can deliver in direct drive.

bdiddle
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DBCstm wrote:
You need to put an 200 ohm resistor in place of the reverse polarity diode at the base of the red positive to led wire on the driver, on the other side, you need to put a 4.3V Zener on top of the capacitor next to the 7135 chip, with markation line away from negative ring.

Mouser has these for cheap. I bought ten of each for like $6..

Thanks, are you getting the correct output? I remember reading that comfy(?) was getting half the normal output.

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DB Custom
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You will not have reverse polarity protection, or over discharge protection, nor will you be able to re-program the driver after this mod.

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I’ve got 4 380 binned chips added and am seeing 4.41A at the tail in my K3 head driven by 2 Panasonic NCR18650PD cells in an L2P body. Even running 2 Efest IMR18350 cells I still get 4.40A.

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The output when using an XM-L vs the MT-G2 emitter. And yes, for some reason the driver output differently to the 3V emitter as compared to the 6V one.

bdiddle
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Sweet. Right now I only have Efest 16340’s, I’ll have to order a pair of 18350’s.

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You do understand, don’t you, that you won’t be able to use this to drive it harder than your cells would run it direct drive? The chips won’t bump power over what your cells are capable of, they will limit it if you don’t want to run a full 6A output, but they won’t exceed that.

At 4.40A this bad boy makes some serious heat! Be aware of that! I’m talking over 130º on the head in less than 5 minutes.

bdiddle
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Yeah I just want to have some lower power modes so it is a marginally useful light rather than something that gets burning hot in short order.

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DB Custom
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I’m seeing about 1.15A on medium for ~700 lumens and .04-.07A on low which is really cool. Nice tint across the board.

bdiddle
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Yeah I will likely mod a Qlite so I have moon….unless moon doesn’t work with the MT-G2

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The one pictured is a Q-Lite. I’m running it on the default settings and low is very nice.

Edit: Don’t know if it’ll run a true moon mode, but low in the default is probably 30-40 lumens or so.

bdiddle
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Have you tried it with moon?

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I don’t mess with the stars as I like the default settings. Don’t know if the MT-G2 will run at that low a power level though, seems like the charts have it starting up around 350 lumens at 500mA. I’m seeing less lumens than that but honestly don’t know how low it will go.

comfychair
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MTG2 moonlight mode, too low for my DVOM on the 10A scale, reads 0.000

this is a 105C using the Nlite firmware, I'm not sure if/how the Qlite moon mode differs from the settings DrJones used for Nlite.

MTG2 C8 thread: http://budgetlightforum.com/node/23829

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What mine looks like to a 1/8000th sec shutter. Those little dies look awesome all buddied up in there!

outersquare
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This might be blasphemous, but I have similar “issues” with my direct drive MTG2 C8, it’s basically too bright to use at night outdoors.

Even pointed at black pavement several feet away, the beam makes me squint and messes up any night adapted vision.

This LED with LiMn batteries is totally insane.

bdiddle
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outersquare wrote:
This might be blasphemous, but I have similar “issues” with my direct drive MTG2 C8, it’s basically too bright to use at night outdoors.

Even pointed at black pavement several feet away, the beam makes me squint and messes up any night adapted vision.

Haha yeah. It’s pretty sick. Ordered some diodes and resistors from mouser, hopefully they get here quick. In the meantime I will get a Qlite driver set up for 5-6 amps.

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I ran the K3 on hi for 6 straight minutes, the cells still allowed 4.32A and were down to 3.65V each. Started at 4.40A with a fresh charge on batteries just received today.

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Are you sure you got 6 amps out of the Efest 16340's running a mt-g2 direct drive (for more than a second) ? Seems a bit much, but I may be wrong Smile

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This first one is with the K3 on Low, at .07A 5DMkII 1/8000 sec f/6.3 ISO50
DBC_August 15, 2013_135905

This is on Hi at 4.40A, through a welders #11 plate used for eclipse pictures 1/4 sec f/4 ISO100
DBC_August 15, 2013_135212

Both shot with the 100mm Macro f/2.8L IS with the closer shot about 4” from the bezel.

bdiddle
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djozz wrote:

Are you sure you got 6 amps out of the Efest 16340’s running a mt-g2 direct drive (for more than a second) ? Seems a bit much, but I may be wrong Smile

It was a wild ass guess Silly

It seems to be 2/3 the brightness of my modded 9T6, which I think is right at 5000 lumens.

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bdiddle
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Well I just tested the current draw with 2 fully charged 16340 efest batteries.

Using my harbor freight cheapy with the stock leads I get 5.25 Amps.

Considering the added resistance of the DMM with leads, I’d say the draw is ~6 amps.

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djozz
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Wow, I expected them to deliver no more than 3 amps at 7+ Volts. That is good news Smile , thanks for measurimg.

Bort
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This is crazy, i love it
how much does it cost (batteries, emitter, driver, misc parts)?

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bdiddle
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Well the output does rapidly fall. With a 7135 based driver I’ll likely keep it at 4.5A on high.

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FmC
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I’m looking at a Mouser search page for 4.3V Zener diodes, & there’s quite a few different one’s to choose from….

Can someone ‘hook a brother up’ with a suitable one to use with the Nanjg driver?

Thanks Beer

bdiddle
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I took a guess. If mine work out I’ll post a link.

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bdiddle wrote:
I took a guess. If mine work out I’ll post a link.

Thanks – I already have a C8 + extension tube + AR lens + bored out reflector + MTG2 sitting around. Putting all of it together with a working driver with some modes will be sweet action Smile

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Directly from my Mouser confirmation
1
RoHS: Compliant through Exemption1
71-CRCW0805200RFKEB
CRCW0805200RFKEB
1/8watt 200ohms 1% 07/29/13 10 0.048 0.48

2
RoHS: Compliant2
512-MMSZ5229B
MMSZ5229B
4.3V 0.5W Zener 07/29/13 10 0.149 1.49

Have fun!

Edit: Please note that I got 10 of each, for $1.97 + shipping.

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Thanks for that Beer

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