i no man them little buggers can germ fast i had sum that popped in less than 24 hours. yh like villui said it should'nt cause u any problems switching from mh to hps on a 24 hr light cycle but wen u do get the hps the temps will probably go up as well so i would watch that but i guess it all depends on what the ventalation is like in ur room. ne way its all looking gd man well done!