Beam looks great in flood and throw. Your video kind of swings around a lot. I imagine it's hard to work the light and record at the same time. Thank you for taking the time to provide the video. You got me wanting one of these now.
I’ve actually used four lights in video. First one is 10mm led photon clone from KD ( I am very satisfied with it) and second one is generic 5 led bike light. Four lights in four pockets :bigsmile: .
It’s my 4 months old dog. He follows me where ever I go
Oh, it's hard to tell in flood mode if you are just in low or medium mode. I probably should have looked for tint clues. At what times in the video are you using the light you built in the OP?
It would be good to know when the other 4 lights were used too.
Nice build mtg2 sk98 build!! I like the way you fabricated extra copper for the heatsinking, trust me, this light runs HOT when its zoomed out
For my build, I played cheat and used a bunch of singapore 1 cent coins (made mainly of copper) stacked against the back
Sadly though, it seems to lose a lot of light upon zooming out, probably need larger asperics as the sk98 is still too small, ive moved my mtg2 from the sk98 to a smiling shark sse7 (ultrafire z5 1x 28650 clone), aspheric is now 28mm instead of 20mm
Its a hollow pill, so I filled the entire length of with thermal paste and stacks of 1 cent coins
It seems to throw slightly better, have you ever considered shaving the mtg2?
Thanks
I saw your topic, good work. I would only replace/modify switch because stock has relatively high resistance and over the time resistance will increase. My idea of building MT-G2 pocket zoomie was only massive flood so I have no need for shaving or dedoming . To me, zooming is just an option if I need a bit of extra throw. For pocket thrower I have sk98 with dedomed XP-G2 which was before dedomed XM-L2 and in the near future it will be dedomed XP-E2 for max range. About sse7… I saw how xm-l looks under 28mm aspheric. It just looks like it have more throw but that is just illusion because lens has longer focal length (even more light is wasted) thus spot looks smaller. For best light efficiency host had to be reflector based with AR lens (something like convoy S series with SMO lens for truly pocketable lumen monster).
Yeah can’t compare with an XP-G2 or E2… Maybe using special optical lenses? (Ahortons?)
I guess there’s not one light that can do all, I tried putting it into a convoy m2 before, it had great hotspot, but i still prefer the versatility of zoom aspheric hosts… still, even with 20%~ or so loss having 2000+ lumens in a small package still isn’t really a bad thing
I’m becoming a big fan of dedomed XPG2 in small aspherics…. reasonable flood with great throw.
XML2 or MTG2 in aspherics… not as much. You get great flood with the option to goto spot mode for some slight additional throw when needed. It’s a reasonable compromise, but you’d never carry a light like that for throw.
Yeah i agree too… i dedomed a xpe from a random light lying around and put it into an SK98, surprisingly it threw really well, the beam is pencil thin and it flew pretty far, and when un-zoomed it floods reasonably well…
I feel I am missing the explanation of how you are giving it enough current to need the copper heat transfer parts. From the Cree site, 3 A at 6 V. There doesn’t seem to be enough 7135s and maybe not enough batteries for that.
Um…it’s still making ALOT of heat the MT-G2 emitter is what 2x-3X the size of the XM-L and the SK98 just doesn’t have alot of meat to absorb all that heat…copper will pull it away, and then dump it into the aluminum pill, aluminum pill to body, and all it can do at that point is just get hotter and hotter and hotter, these flashlights just don’t have the mass or surface area to convection that heat away…unless you consider the palm of your hand a good heatsink
If you look, he has stacked 18350’s, pushing 8.4v at full charge, thru the regulator (this is why he put the voltage divider 200ohm resistor and zener as to not smoke the ATtiny13)
Per the MT-G2 spec sheet:
The thermal resistance of the MT-G2 LED is 1.5 °C/W, so at 18.5 W the junction temperature (TJ) will be approximately 82 °C
6v at 3A is 18 watts…so he has 179.6F worth of heat in his hand…that is plenty hot to make me want to drop something that hot pretty quick
It is overdriven with total of 12 AMC 7135 rated to 350mA each. Theoretically they should give mi 4.2A on high but I’m reading 4.48-4.52A. 7135s basically don’t ask for voltage as long as emitters Vf is close to input voltage. In this case 8.4v and under load input voltage drops under 7V so 7135s doesn’t need dissipate more than few hundreds miliamps. Copper is added for keeping led performance for longer period…