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What is the perfect sealed room?

A

adz007

Member
Hi Guys
Please list the numbers you use in your sealed room in a similar format to below.

Lights On
CO2: 1200ppm (was 1500 but next run will be 1200 after reading this https://www.icmag.com/ic/showthread.php?t=221893).
Temp: 85F (is a bit lower in the mornings but aircon set to come on at 85F)
RH: 75-85%

Lights Off
CO2: 500-700ppm (CO2 burner set to go off an hour before dark and ppm goes down to 500 but gets back up to 700 as the plants are putting out CO2)
Temp: get down to about 75 during lights out
RH: Gets up to 90% something I'm a bit worried about. Anyone have any thoughts on this?
 
Jnugg

Jnugg

Active member
Veteran
Sounds like you need a dehumidifier as those RH levels.are insanely high both lights on and even more so lights off.
 
frankenstein2

frankenstein2

Astronaut Status
Veteran
If your running your equipment the right way, and moving air like you should, there should be a 10 degree swing from day to night. ( 10 degrees cooler during lights off. 85 is about the hottest my sealed room ever get's . I have co2 as well. Humidity stays between 50-55% because I run perpetual. Even at night the humidity stays there. You really need a dehuey, bad.
 
moses wellfleet

moses wellfleet

Well-known member
Moderator
Veteran
Ok be like that then...the thread on VPD is very interesting, I haven't seen that before. Info from spurr I usually top draw, dunno why he was banned.

I run the same temps and RH as you during lights on, without some kind of dehumidification you will get way more than 5% increase at lights out provided you have the average 10% temp drop. You have not invested in the essential equipment if you don't own a dehuey.

I have never seen Any detrimental effects from high co2 levels during lights out. I have stopped even measuring it as I don't think it is relevant.
 
A

adz007

Member
frankenstein2 said:
If your running your equipment the right way, and moving air like you should, there should be a 10 degree swing from day to night. ( 10 degrees cooler during lights off. 85 is about the hottest my sealed room ever get's . I have co2 as well. Humidity stays between 50-55% because I run perpetual. Even at night the humidity stays there. You really need a dehuey, bad.
Click to expand...

Yeah Im looking at buying one at the moment but I'll probably try to keep it around 75-80% as from what I've read this seems like the optimal range according VPD. Just about to finish my first run in a sealed room so I'm still working things out, but going well so far.

moses wellfleet said:
Ok be like that then...the thread on VPD is very interesting, I haven't seen that before. Info from spurr I usually top draw, dunno why he was banned.

I run the same temps and RH as you during lights on, without some kind of dehumidification you will get way more than 5% increase at lights out provided you have the average 10% temp drop. You have not invested in the essential equipment if you don't own a dehuey.

I have never seen Any detrimental effects from high co2 levels during lights out. I have stopped even measuring it as I don't think it is relevant.
Click to expand...

Sorry Moses didn't mean to "be like that" I just think that our 2 threads are different :) and thanks for your input always interesting to find out how others run their setups :)

In spurrs thread (https://www.icmag.com/ic/showthread.php?t=221893) about CO2 I think he says the optimal CO2ppm at night is around 400ppm but I dont think its as important as I also get ok results with ppm higher than 400.
 
O

overbudjet

Active member
Veteran
I..M.O.H. at 75~80% rh ,you will hit the wall before harvest did you ever see what PM can do,do yourself a favor buy a big dehu.
 
A

adz007

Member
overbudjet said:
I..M.O.H. at 75~80% rh ,you will hit the wall before harvest did you ever see what PM can do,do yourself a favor buy a big dehu.
Click to expand...

Hi overbudjet thanks for the input and advice. Its hitting 85% at night which I think is definitely too high so I'm freaking out a bit and will be purchasing a dehumidifier for the next run. I have a week left to go so hopefully it goes ok and I will will keep a close eye on things. In general I think around 75% is fine maybe lower in that last week, I used to think it had to be around 50% was optimal until I read up about VPD and there's a great thread on another site called "lies-our-fathers-told-us-humidity" a good read if your interested. With high humidity good air circulation is a must to help prevent the PM. I try to post up some pics later.
 
Green_science

Green_science

Active member
If you can cope with it, the higher the humidity the better, (within reason <90%).

I know guys who accept loosing some harvest to mold just to grow at these higher RH's because they feel even after the loss of crop to some mold they still out yield what they would get growing at lower humidity.

The science behind it is simple, higher relative humidity = stomata open more, and for longer periods, since stomata are responsible for Co2 intake..... well you do the math.

By far the biggest fruits I have ever seen, have been grown at 70%+ RH in Co2 enriched rooms.

Trick is to have dehueys, and massive air movement

Rest of the numbers you said look fine, GL
 
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