I just put the second led that I got in my GT micro. I know, this nice flashlight deserves better than green, but I could not resist. The steps I took:
*Unsoldered the ledboard, unsoldered the XP-L Hi, added a little solder paste, soldered the Green Flat on the stock board
*had to use a new centerpiece with square cutout to center the led. Sanded it the same thickness as the stock centerpiece, made the cutouts with a scalpel to fit the Green Flat 45 degrees rotated.
*Reamed the reflector hole to fit the new slightly larger centerpiece. Can’t go back now to stock 
*Closed the head and test: perfect focus on first try 
, also tells that Lumintop did a good focussing job
*did a spring bypass on the tail (with tailboard in place).
Wow, that is a bright green spot. I carefully measured it (purple Efest battery, 30 seconds) at 7 meter with my best luxmeter: 177 kcd. I measured a few known lights to check the luxmeter (it reads high with an almost depleted battery), and it reads correct. The output (purple Efest, 30 seconds) I measured at 930 lumen, good enough, that would be between 3.5 and 4 A.
It does well outdoors as well, spot aimed at about 70 meter. 
So now I scratch my head what to use it for. Showing off to my son I guess :party: