Lovin it400w above each one so they have their own light.
The triple FFF i can recommend mate but the "50% increase in yield" claim? itchy beard LOL. Basically trip F just forces the plant to uptake more nutes at the peak time in flowering and it does work but i think the "more yield" thing is a bit of a red herring , it's more about the improvement in quality for me. That shit is'nt cheap either , i don't know anything about big bud or xl but trip f is like £60 a bottle