I should have clarified….
That driver won’t push the MTG2 to nine amps, at least if you’re using 2 cells.
I tried it w/ two brand new MNKE IMR 26650s. If you scroll down through the pictures you’ll see tail current measurements.
Summary: 48 watts into the driver (at turn on with FULLY charged cells)
If the driver was 100% efficient the emitter would be getting about 7.3 amps.
It most certainly is NOT 100% efficient.
I doubt it is less than 50% efficient…but at 50%, the emitter would be getting just below 4 amps (lower Vf).
My best guess…is right in the middle of those….so 5.5 amps…
If you’re talking about the 3-18V, 5A driver, you’re going to get more like 3.5 - 4A at the emitter.
edit: which is still plenty - and it will still be brighter if you solder that right to some copper 