Sofirn IF19 regulation and 18650 tube

The ZeroAir runtime graphs seem to show that the output is not regulated that well. My question is: as the battery voltage decreases, what happens when say the turbo mode is activated? Does it momentarily go to as high output as it does when the voltage is high or the driver that the light uses prevents it from happening?

Another question is: is it possible to get a longer tube for this light and use 18650 battery instead of 18350 to extend the runtime?

And a philosophical question: the SC21 Mini has a nicely regulated flat output and apparently uses v. similar UI. Why the same driver couldn’t be used in e.g. this light as well?

Yes, a 18650 tube is available.
Currently it shows Black is Sold out but Silver is available:

$4.43 | 18650 Battery Tube for IF19

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FYI, in case you have already have another Sofirn or Wurrkos tube you aren’t using; Unless they’ve done something extremely weird and changed their threading standard for Just this light, ANY 18650 or 18350 tube from Sofirn or Wurrkos should fit the head/tail perfectly. I’m interchanging boddie heads and tails between all other 18mm models between both brands without issue.

The thread also matches the New srandard from Convoy, although I’ve had length of thread issues using Convoy tubes with some heads… Threads bottom before tube contacts the driver board.

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