weenmeoff;2922579 said:
Thanks Nis! I'll try the cheap version for now.
Thanks Rad! The CO2 set up with controls sounds complicated and expensive. I'll need to do more research but for now I will try the cheap route that Nis suggested.
When you say with a large enough fan, the co2 you add would be gone in a minute, but wouldn't it be replaced with more at the same time...?
Well, yes, there will be more co2 added each minute, more A/C added cooling each minute, and more heat from LEDs extracted each minute.
Think for a minute about about A/C in a car.
When you want to take full advantage of the cooling, you punch on the recirculate button- it works but the air starts feeling stale. Your body craves the oxygen from the outer air because in a confined space you are using up the oxygen in the air. This is similar to your plants locked in a room with no outside air wanting more co2 - this is the time in which you want to add co2.
When you turn off the recirculate in your closed car, the A/C is a little less effective but the air is better. The amount of air moved in your car is now similar to a bathroom fan. There is enough air flow to eliminate odors and keep the air somewhat fresh. The A/C still works well. Supplementing co2 would still be good for plants. If you only have a 30-50 CFM fan in your tent, this would be similar.
But A/C with the windows up is still too hot when you first get into a car that has been sitting in the baking sun. When you want to cool down fast you roll down at least one window on each side of the car. Driving at 30 mph your car cools down from 130F to ambient air temperatures in under a minute. For that first minute A/C doesn't matter, the goal is to get that overheated air out of the car as soon as possible. There is plenty of oxygen to breathe and the air is as fresh and cool as outside.
In my opinion, running hundreds of watts of light in a flowering room is like that overheating dashboard in a car, you often need to push around A LOT of air to cool things down. Once you are pushing that much air, there is no need to add oxygen or co2. There is fresh air to breathe every second. When the lights are burning bright, the co2 just gets flushed outside by the moving air.
The time when additional co2 has time to accumulate in the air is the time when the exhaust fan is off. If the exhaust fan is off and the lights are on, adding co2 is beneficial to your plants. But the largest length of time when the exhaust fan is off, the lights are also off. During the hours of darkness, plants breathe differently: plants breathe in oxygen and breathe out co2. Adding co2 with the lights out makes it harder for plants to do their night time breathing. For co2 to be beneficial to the plants you really need the controllers that add co2 only with exhaust fan off and lights off. Without the controllers, you are spending your money to do some good in the daytime and mostly bad at night.
If you have your exhaust fan removing air from ONLY around your lights and not air from the room, then you can benefit from added co2 without an expensive controller, but still only when the lights are on. You still want your co2 generator to turn off and on when your lights turn off and on. A chemically reacting container won't do that unless it has a way to be opened and closed. The expense of doing it right is why I don't add extra co2.
weenmeoff;2922579 said:
Still no concrete signs of sex yet. One of the clones now has alternate nodes though.
I saw that in your last photo. Good stuff happening
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