It’s a 26mm FETDDsir404Vishay Mtn driver Standard E-switch 6 levels with 18awg Leads with the (+) lead drilled thru the driver base and directly soldered to the spring. I even copper braided the big ass tail cap spring, probably don’t mean much!
Emitter failure, Yes this isn’t the first time I boiled the XP-L HI V3, I had a Cometa pulling almost 7amps and it broiled the flat silicone cover off and of course it failed, but I don’t use Turbo too much, the next 2 levels down are more than enough, I’m not hunting Jackyl’s! 
As far as the new 20700’s go they perform just as good if not a tad better than my Sony VTC5A’s, I’m using the high amp A’s and they seem to be pretty good performers so far?
Quote:
This 20700A is a true high performance cell that I am rating at a cool-running 30A 3100mAh. It performed well against the top 18650 cells for performance, vaping time, and safety (high amp rating). The 20700A…
…hits as hard as the Sony VTC5A at the start and easily holds its voltage up higher for considerably longer.
…runs about 20% longer than the VTC6 at 20A continuous down to 3.2V.
…runs 5°C cooler than the LG HB6 at 20A continuous and for about 230% longer. Yes, 230%.
Here is a quote from this thread 20700 Batteries What is real? and it seems to back up what I’m seeing from my personal experience! And these batteries are even pushing better then my brand new Liitokala’s, not really impressed with them so far, do these Liitokala batteries need to be broke in, drained and charged a few times before they perform?
As far as LUX, it increased a bit, nothing I would call outstanding, so I’m thinking the LED is maxed out as far as output, but I have some V6 1A’s stewing in some new stuff I’m trying out, this fliud is really strong smelling, I had to put it the container in the garage, but I’m going to give them a GO!