I have 9 clones now and a new mother...

For my Flowering room: I have around 5' of head space... I use a 400w HPS globe, 15" hood, convertible ballast(HPS/MH) etc... for grow room.

Right now I put the little girl in the empty flowering room under the HPS (18/6 still). My veg room is too cramped, plus I only have fluorescent light in there.