Are you talking about hot cold temps or kelvin temps.. the temps should be between 75-80.. the kelvins for vegging are around 6000 like the cfl's that you have... about the superthrive.. u should wait untill the plant atleast has its fifth real set of leaves.. and about 1 or 2 drops per gallon on that stuff cuz its very concentrated.. hope this helps.. good luck
~Notorious