good halide bulbs with ati t5 bulbs really depends on what kind of halide mogul base or double ended u can get better with double ended mogul base u limited on brands least i was with my 175w ones. then either run ati blue plus or a blue plus and purple plus or two attinic really depends on look u going for u get better coral color with a 18k look both better growth out of a 10k look thats for sps lps and softies is different they probably do better under the 18k look since they usually require lower par reading . im sure some one will correct me if im wrong i dont keep lps really just going off of what ive read and heard