Hmm…
Maybe you’re right.
I don’t have an XHP50.3 HI light.
I have an XHP70.3 HI light. 
SFT70 LES = 6.51mm² link
XHP50.3 HI LES = 8.41mm² link
SFT90 LES = 9.6mm² link
XHP70.3 HI LES = 14.6 mm² link
I’m still learning about flashlights every day. 