OK I think I found the best host for this build.
4 Less XHP70 but the light will likely be even brighter due to ease of battery configuration. 8-12 VTC5 can easily be used via extension. No battery pack to mess with. This host also has excellent heat sinking and current transfer potential. Does wonders for high driven lights. 2S2P battery configuration is also much safer than 4S.
So...TK75vn1670 & TK61vn2070 ;-)