switching today mate I was going to last week but wanted new tent set up correctly and make sure heat was OK .and ventilation. seems to be holding temperature at 77.5 at canopy. and 80f at lower part I have a 600watt hps cool tube in but instead of the heat being blown outside the tent iv kept it blowing inside.I have it connected to a 4 inch in line fan suckling air from an open window to blow cold air onto the bulb. then I have a 6inch rvk fan with a 2ft carbon filter at conopy. a 16 oscillatin fan on the floor in the corner aimed upwards slightly and a 6 inch clip on fan attached at around 4 ft up. I have vents open both sides and rear and also a 4 inch ducting attached to bottom port hole again going to an open window for fresh air to be pulled in from .so hopefully this is all OK .. 1St ever grow for me .. these are white widow. had a few problems but had some amazing help on ere. also got some white widow bubblegum. .. white widow x big bud. . and some money maker to go at ..