[hardball420]

Hey Mr. GoodStuff, first off, thank you for your posts. Yes you are right, with certain deficiencies you can burn leaves with just a little heat. Even with water-cooled lighting. They were hung at about 8 inches which is usually adequate. However, I just raised them to well over a foot after reading these posts.

As for ventilation, I have one large oscillating circular fan that blows across only the top of the canopy, and one small, static circular fan that sits on the table and stirs the air beneath. I also have a mobile a/c blowing upward above the lights, which runs constantly. It is a duel exhaust which I have left the intake open in the room to exhaust air out until the completion of the installation of my water-cooled co2 gen. I also just installed a can fan in the attic which I planned to air-cool the light tubes with to get my energy consumption down. I may just use it as an exhaust fan and use my a/c properly. With all this Im still fighting with powdery mildew. It was a cheap oscillating fan and doesn't blow super hard.

I have two thermostats in the room- one digital placed just below canopy level, and one on the wall a couple few feet away. They both read between 75 and 80 F usually. But on hot days it can be as high as 87 88 F.

With the ppm around 700 one and a half weeks into flowering do you think maybe that is low? I have'nt read anywhere they do this from overfertilization. One plant has the tips slightly burning like it is either a K deficiency or nute burn which sounds unlikely

Anything helps guys THANKS