Interesting thanks, good to know 
I got some inspiration from FmC about using an xpg2 s4 for this light. So I swapped out the led and played around a bit to get the best focus. I couldn’t quite reach FmC’s numbers but I was close and very happy with the outcome :party: Thanks for the inspiration FmC.
That must be close to a laser beam? 
Lol, I reckon aspherics are more laser like because of their lack of spill. This has usable spill
No worries :)
I have a little time off, & I'm in the process of putting the KD reflector in/on a Fandyfire L3 (2S3P) w/buck driver. I have a spare XP-G2 S4, so I'll see what I can get out of it!
Cool! I’ll be lookin out for that.