Quote Originally Posted by Rusty Trichome
Your information is inaccurate by almost 20 degrees.

At about 108 (9% ambient humidity) the plants start to fade, so at 104 or 105 I shut off the lights.

I've been doing it for years, but there are a few tricks and techniques to make the situation tenable. Check my signature for the 'Dealing with heat issues' thread. I just checked about 10 minutes ago...it's a comfortable 95 degrees in my flowering shed with my 1000w HPS running. (97 outside)

But yes, it is easier on the ladies to maintain a reasonable temperature using 'normal' grow techniques and guidelines.
Good to know. I have been under the impression that above 90 degrees is too hot for plants. Mybe that is just the temperature that the large growth spurts slow down in vigor? Either way, it is just information that I have read in a couple grow manuals but nothing trumps actual hands on experience (which it seems you have a lot).

I haven't had to deal with extreme temps, in either direction, yet, as my particular lattitude has a very temperate climate (central coast Cali).

So, in other words, I would listen to what Rusty has to say. I have been reading a lot of his posts very closely. and he definitely seems to know his stuff