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I am about to make my grow room airtight so I can use CO2. The lights (2 600W HPS) I'm using will be aircooled with less than 10 feet of venting from start to finish. I assume its best to have the pressure in the room be a little bit positive so that I don't suck the CO2 out through any leaks in...

I was planning on buying some kind of CO2 tank and ppm meter contraption. How do you maintain a good level of CO2 in the room?

Well I can see that at least my hoods aren't 100% airtight. So I can't really air cool the lights without changing the pressure in the room a little bit. If I was just using say a 300CFM fan pushing air through my leaking lights wouldn't that increase pressure in the airtight room? I'm a noob...

Okay I'll have to pick one of those up. Are you using CO2?

Okay that makes sense. How do I go about tracking root temps?

90 seems a little high, are you using CO2? And is 60 degrees when the lights are off? Are you saying that in your experience bud quality doesn't suffer from the extremes of that tempurature range (stretching, fluffiness etc.)? I know plants will still look pretty good in a wide range of...

Cool thanks. Any suggested temperature range for the leaves when using CO2?

I am about to make my grow room airtight so I can use CO2. The lights (2 600W HPS) I'm using will be aircooled with less than 10 feet of venting from start to finish. I assume its best to have the pressure in the room be a little bit positive so that I don't suck the CO2 out through any leaks in...

I have a thermometer encased in black plastic hanging at the top of my canopy. Since it is black the temperature it gives me is about 5-10 degrees (F) hotter when it is directly exposed to the light. I currently have a white piece of paper shading it so that it gives me a more accurate reading...

The perpetual grow (harvesting every two weeks or so) works better when you have multiple lights and/or more powerful lights. That way you can keep a light lower so it is close to the smaller plants and another light up higher for the taller plants. If I was doing it under a 400W light I would...

I wouldn't let them get that tall. IMO it would be better to use 6-8 plants in 8 inch pots and start them flowering at no more than 12 inches. LST and Scrog are cool but they take more veg time and you have to mess around with your plants a lot. SOG is the best way to get the most bud out of...

What does this mean exactly? Sorry I'm a little slow :eyesmoke:. I was told to use an intake fan only so that I don't suck the CO2 out of the room.

The rule of thumb with lighting is 50W per square foot. Grams per watt is a good indicator of how omptimal everything in the grow went. With artificial lighting you are better off having a higher ammount of small plants because the light can't penetrate very far through the canopy. My last...

I'm trying to figure out what the minimum cfm rating my venting fan should be. I'm growing in a closet that is about 200 cubic feet and I'm using two 600W lights. The room is soon to be airtight so that I can use CO2 (So I want to keep the temp in the 80's). The lights will be air-cooled with...

I'm trying to figure out what the minimum cfm rating my venting fan should be. I'm growing in a closet that is about 200 cubic feet and I'm using two 600W lights. The room is soon to be airtight so that I can use CO2 (So I want to keep the temp in the 80's). The lights will be air-cooled with...

I'm using H2O2 along with my airtsone so I assume there's plenty of O2 in the water. I want everything to be optimal though, so is it really worth it to upgrade from the airstone?

Would this work, or is there a better kind you would recommend?

The ppm on my tap water doesn't change either, no matter how long it sits out. I wouldn't worry too much about chlorine in tap water, some growers say it helps keep the water and roots clean. So by "cleaning" the chlorine out of your water you could be doing just the opposite. I've always used...

Are you asking how long it would take for that stuff to evaporate?

So you are saying airtsones are more effective than just an air hose because a higher ammount of little bubbles is better than a small ammount of big bubbles?