MT-G2 COURUI Anyone? Another O-L mod. PHOTO HEAVY - BEAM SHOTS ARE UP! 02-06-14

I am adding this one to my "must do" builds.

This is going to be ridiculous! Cant wait to see it!

I am using a 6V MT-G2 with NANJG drivers, using the zener mod. I need 2 in series, for the voltage and the 3 sets, (in parallel), of 2 in series, gives me more amperage. 3x18650 in series is just too high a voltage.

EDIT: I coulda just read Post#3 before I made this one.

Even 8 ounces of copper under an MT-G2 at 6.77A is really not enough. 140º on the outside of the head in 5 minutes. And that’s with the copper exposed directly to air, with fins.

9A takes more, lot’s more, not sure if there’s room for enough copper in that light, but it should be fun to play with in bursts.

Updated the OP.

O-L, have you tried Windex (rubbing alcohol works too) on a cotton ball? No scratches. :)

Can’t wait to see the finished product. It should be amazing.

Every time I have used a Cotton ball, it has scratched the reflector. Maybe next time I should not use the ones you pick right off the Cotton plant and use the processed ones instead.

I stopped using Alcohol many, many years ago, but there are still times when feel like I would like to.

I’m clueless, but I sure do appreciate the photos, descriptions, and the time involved in bringing it to the Forum. THANKS!

I always enjoy looking at your process of making copper heatsinks/slugs/inserts. It is always amazing seeing it go from a few pieces of copper pipe to a glorious chunk of heat devouring paraphernalia.

Nice, you made my MT-G2 envy that much stronger…

I sit here after spending a weekend of 40+ degree heat in a lake far away and come back to this. Am I delerious or is OL. What an effort. I’ll have to come back in a couple of days and read this again and make sure that what I just looked at in pictures actually happened.

Hey! That’s my line.

Nice mod, at 9 amps there will be 60 W of heat, my guess is that is will dissipate fine, with the led on copper just going strong (still waiting for the first well mounted led on copper fail from overheating, in any host), not sure about your hands though after 10 minutes. Well, the batteries are near empty by then, so even your hands will survive.

I understand the thermal advantages of all that copper, but you have a shim between the emitter and it’s board, and another under the screw-in emitter shelf, raising the emitter towards the reflector. How do you compensate for the added height when you reassemble the light? Was the original emitter on a really thick circuit board?

Re-post #11 ;EDIT: I coulda just read Post#3 before I made this one.

OL, your post helped. To be honest, Comfychair’s answer probably makes sense to more experienced modders than it did to me until I read you’re post and then re-read his post. So for me the effort was appreciated and helpful from you two. Thanks.

The original was on a thin board, so there will be issues. What will have to happen, is the head will not be down all the way and I will have to make some type of spacer ring, like a copper ring, so that the gap will not be as noticeable. If I had a lathe, I would just have cut the shelf inside the light lower and threaded it deeper, so that the led would be in original position, but I cannot do that by hand, so it’s a just do what I can kind of thing.

I figure what will happen is this. At first turn on, it will be bright as hell for about 30 seconds. Then the batteries will sag a little and it will get dimmer. After about a minute the whole head will be warm, but by then the 7135 chips will start to back off and loose power, because they will be hot and the light will get dimmer and dimmer quickly. So… all in all, it’s a 30 second light for max power and after that, it will just keep getting dimmer, so it will probably never get too hot. Within 3 to 4 minutes, I would expect it to be at about 70% to 60% power on it’s own, just from battery sag and overheating 7135 chips. What I am waiting for is someone to make a dedicated driver especially designed for the MT-G2 and a light/reflector for it too.

I think I will pass away before I ever see that day though.

Eat lots of kale and tofu.

Then you won't mind passing away so much.

There's no such thing as a "MTG2 driver", it's just a LED that needs a higher voltage than a single XML. Anything that will run two XMLs in series will also run a MTG2, the driver will never know the difference. There's probably 20 drivers listed in the 'post your MTG2 driver results here' thread that work straight out of the box with no mods required.