with the 250w CFl you're only gettin at the max 20,000 lumens so 40k 10k per plant keep the light about 5-6 inches from the top. you could do 4. veg till 18' then flower
by far the best, most efficient way to get high is with oils and a skillet/swing set up on a bong or hash bowl on a bong with using a herb iron or hemp wick
Im using the 3 pack along with FF ocean forest and my plant has been doing great since day one, have never had a problem with burn 8 week old black buba clone, 2 weeks into flower ill post a pic
I got a clone here in denver, the dispensary owner told me it was 'black bubba' black dominion X bubba kush. im sure there are many names for it though like u said 'black kush' im in the process of growing it. maybe ill post some pics