I did some testing tonight to see if i could match your numbers. made 2 different lights w FET driver and dedomed xml2 led’s from MTN Elecronics and did a tailcap spring bypass with wick.
I get the following using dual hs1010’s (i got a second one cause i was never seeming to get the same numbers as posted here but the both read exactly the same) at 6’ 30s after turning on
XM-L2 U4 1C 363kcd
XM-L2 U3 1A 300kcd
Tried changing lenses, making it direct drive and bypassing the switch. None of these mods made any appreciable difference to the result.
cheers