rh too high when lights off? 60%

NeWcS

NeWcS

Well-Known Member
So I have been in a battle with PM for some time now. Nothing major and nothing that is affecting the plants. It shows up around week 6. Not on the fan leaves, but the sugar leaves, right next to the bud on some of the lowers.

I haven't seen any in a couple weeks since I used Dragon Juice-PM(A local company I think) and greencure but I wanted to ask you guys about my temps and humidity. So the room my 4x4 is in stays around 45% hum. When my lights are on the hum. is normally around 45%. I'm not sure of the hum. when the lights are off, because I don't go in there but my high is normally around 55-60% on the min/max meter. I would assume this is when the lights are off.
Code: 
min; 64d 30% rh
max; 78d 60% rh
I know I could hook up my a/c as it has a dry mode and use that to just regulate the rh in the entire room. But based on the electric use, ~750w I can't use it. I have been doing all I can to be as energy efficient as I can. Took down my t5's and replaced them with led tubes in my veg and nursery tents. 100% led in flower. So with that said I need to do this on the lowlow. So if you guys think I need to get that 60% lower, could I buy a small dehum. and put it in the 4x4 to come on when the lights go off?

I have an oscillating fan blowing across the canopy and a 6" 440 cfm duct fan going 24/7. I have a dampener system setup.It's a passive input pulling air from within the room. There is an 4" can-fan on a thermostat that kicks on when the temp goes over 84 and pulls air from outside. It goes off when it gets to 74. Its also on a timer so it only works when the light are on. When the fan turns off the dampener going outside drops and opens another from air in the room.
 
Deltagreen

Deltagreen

Well-Known Member
NeWcS said:
So I have been in a battle with PM for some time now. Nothing major and nothing that is affecting the plants. It shows up around week 6. Not on the fan leaves, but the sugar leaves, right next to the bud on some of the lowers.

I haven't seen any in a couple weeks since I used Dragon Juice-PM(A local company I think) and greencure but I wanted to ask you guys about my temps and humidity. So the room my 4x4 is in stays around 45% hum. When my lights are on the hum. is normally around 45%. I'm not sure of the hum. when the lights are off, because I don't go in there but my high is normally around 55-60% on the min/max meter. I would assume this is when the lights are off.
Code: 
min; 64d 30% rh
max; 78d 60% rh
I know I could hook up my a/c as it has a dry mode and use that to just regulate the rh in the entire room. But based on the electric use, ~750w I can't use it. I have been doing all I can to be as energy efficient as I can. Took down my t5's and replaced them with led tubes in my veg and nursery tents. 100% led in flower. So with that said I need to do this on the lowlow. So if you guys think I need to get that 60% lower, could I buy a small dehum. and put it in the 4x4 to come on when the lights go off?

I have an oscillating fan blowing across the canopy and a 6" 440 cfm duct fan going 24/7. I have a dampener system setup.It's a passive input pulling air from within the room. There is an 4" can-fan on a thermostat that kicks on when the temp goes over 84 and pulls air from outside. It goes off when it gets to 74. Its also on a timer so it only works when the light are on. When the fan turns off the dampener going outside drops and opens another from air in the room.
Click to expand...
Have you tried running your exhaust 24/7, at six weeks I'm sure your plants are releasing a lot of moisture when the lights are off. Also what's the temp and humidity in the room your tent is in when the lights are off?
 
NeWcS

NeWcS

Well-Known Member
Yes, I have my exhaust on 24/7

I just put a min/max in the room so i'll have a reading soon.

Is 60% too high?
 
NeWcS

NeWcS

Well-Known Member
Great! I just ordered a small dehum.
Gonna put it on a timer to run only when lights are off.
**edit** just going to run it 24/7 as it wont turn on once it gets power. The on/off has to be pressed after it receives power. Oh well.
 
Last edited:
Kingrow1

Kingrow1

Well-Known Member
Forget tent humidity if you have extraction.

Measure humidity outside the tent and this is your exact humidity end off.

Dont put humidity and temp meters under the lights, noobie error.

60% humidity is fine for all stages, quite often thats what my country is and grow tents.

:-)
 
Kingrow1

Kingrow1

Well-Known Member
NeWcS said:
I have a probe at plant level and one 3 feet off the ground...
Click to expand...
If light radiation hits the probe it causes false readings, shading will help.

I merely quote it just incase, there a whole science to reading air temps :-)
 
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