Opie - maybe. The way I see it, like Scrappie said, is that it's easy to keep your plants alive, and any optimizations after that will just improve your yield. I'm sure many of you have gotten better yields than 3 ounces from one plant under a 400-watt light, but i'm quite happy with that.

highallthetime - at the time I set this up, I wasn't working, and AC units aren't cheap. Also, the circuit that this whole system is on is a bit overloaded as it is. I already had to reset the circuit breaker once, and my lights weren't even on then! Also, since it's upstairs it's really hard to run another line up there from the basement. Still, my point with all this is that you DON'T need an AC unit in order to get decent results.

Quote Originally Posted by rhizome
Well, bud porn aside, a more accurate statement would be

In order to prevent stomatal closure at high temperatures, which will limit the availability of atmospheric carbon for fixation, a low VPD must be maintained.

Really, I don't make this stuff up. Here's a link.
First, that's not talking about cannabis, which IIRC evolved in the mountains of India. At high altitudes, there would be a very large vapor pressure deficit. Second, it's not like the stomates just snap shut when the vapor pressure deficit gets too high. Your plant might grow a little slower, sure, but I never said the conditions I grew this plant under were ideal. Third, it's not particularly dry where I live, and the humidity in my grow room was usually 40-50%. Maybe if I lived in Arizona I'd have to worry about the air being too dry, but I don't.

Quote Originally Posted by socialistpete
Khronik you order your seeds or go north to seed banks. Lately I've been going to Toronto and getting them in person. Are you going to vent with outside air this winter? I just put my next crop into flower today and with just the exhaust fan pulling air and leaving the intake fan off with the intake passage way still open I have maintained a temp of 84 all night so far under a 1000w HPS.
I considered getting my seeds in Toronto, but they're more expensive and still quite a ways from where I live. I just ordered them online from europe. I think it'll be more trouble than it's worth to grow in the winter, so I'll probably put my next crop into flowering pretty soon. I'll probably be ok flowering for a couple weeks in december, but I'm probably not up to having live plants in my attic in january and february. I think my attic is drafty enough that I don't need to worry too much about ventilation for the purposes of CO2 exchange though.

However, I live in a house with four other people. The guy that owns the house is cool with me growing, in fact he smoked a bit too much of my crop already. His girlfriend was very anti-pot until she actually tried it, now she's fine with me growing too! One of the other guys we live with smokes a fair amount anyway, and he's cool. Another guy we told about it, and he's cool too. There's just one guy left who lives here that doesn't know about me growing. He'd probably be cool with it, we just haven't told him yet. Anyway, if he's cool, I may be able to build a new grow room in the basement.

Of course that would be kind of expensive, and the guy that owns the house isn't sure he wants a grow room as a permanent fixture in his house.