Vinh`s (latest??) K50 is specified to run in the 6-7A range. With the behavior I have seen Im not surprised to see that he is specifying that range, and not a specific number.
If he have just done a resistor mod, im guessing the light is mostly likely doing up towards 7,5A at startup and sinking below 7A before the power decrease (mine is 6,9, or more like 6,6-6,2A depending on how you look at it).
Use ANSI calibrated measuring device, and measure at 1min 15 sec instead of 30 seconds and there will not be that much difference between the different resistor mods that started in the 6,2-7,5A range. Certainly not anything visually.
Im quite confident that Im running a reliable setup. 20 minute runtime test. Extremely hot light, uncomfortable to hold. No issues.
ImA4Wheelr, I certainly got an amp increase out of it after the 1 min 10 second mark too. But not as much as I had hoped for. My lumen and kcd numbers would have been better with an XM-L2 U2 1A. I cant tell how it compares to the K40 /typical TN drivers when modded. Never owned one of those lights to see how they behave once they are modded.
I can add Im getting same output numbers when cells are 3,7 as when they are 4,2. So that is a good thing.