height isnt really a factor theres still a good 9 feet until the ceiling and just by looking at them i can tell it wont be a problem. i did get the hps/mh switchable ballast but didnt have the extra money to drop on the mh bulb after i got all the nutes and fans and surge protector and everything else. you know much about the terra vega and cannes fertilizer? it seems amazing, i think i waited about a week to long to start introducing nutes so they were a small bit nitrogen deficient but three days after using that terra vega they look healthier than ever. anyways thanks for the advice.