im run n a 2 400 s hps , with 2 under it , with good results, every 1 i know uses the big lights like mine , next time i mite try 1 600 n c how that goes , fluro s r good , ive seen some good result s on this web site , try 1 400 n go hydro 2 kick it on , hydo is easy just sounds hard , about a couple of hunderd 2 set it up , ican talk u threw it , if u want , 8 week s from clones mine r 6 foot ,