How many plants under a Lighthouse Blackstar 240w LED?

I want to try Sannies Killing Fields 12/12 from start to finish. Would 2 be best in a 4x4x6.5' tent? Would 4 be too much?

Secondly in a 12x12 cycle how tall can I expect them to grow? I realize sativa strains can be overwhelming. This is an experiment.

In a perfect world i'd have them growing on my front lawn with holiday lights and bulbs to celebrate the harvest...however that world only exists in the Twilight Zone.

Seriously any one experienced with Blackstar 240w and or sativa strains like Killing Fields could clue me in I'd appreciate it.

Nobody? I thought Led users unite?

Using 2 240w in your tent would work OK. Using 3-4 would be preferred because under high light situations, the plant will not stretch and can grow amazingly COMPACT. I am currently using the equivalent of 3 240w in a 3x3 tent and I'm quite happy with my sativa results. My strain is Positronics Thai grown from seed and cloned for 15 years... My strain seems to grow best under the HO (veg) model lights. -ThaiBoy