Klarus replaced the battery with one that can provide more current of course those types cant reach the same capacity as there is more copper inside to support the current
compare two of the best 18650 with good capacity and high drain capacity
as you can see the one with 3000mAh has a lower voltage drop at same current
the throw distance changed bcs they dont use the Hi version anymore
the discussion of OTF lumens is just rediculus
as you run the LED on full power the output will always drop bcs of the temperature increase
we all know that those numbers like 1000 or 2000 lumens are marketing, just take 80% of it and you get to the reality
if the E4 produces 1700 ish OTF lumens its good enough
also every LED has a range of lumens it provides, so even if you test one it doesnt mean that the next has the same value
I rather get a light thats missing some power instead of going with the current beyond spec