My New Grow

[StrongZZZ]

Wht is the temp inside the tent during "daylight" hours?

Temp is between 68 and 78 and humidity is little harder to control between 35% 60%. I have a humidifier but cannot keep humidity at stable level...

 

[Buds Buddy]

Temp is between 68 and 78 and humidity is little harder to control between 35% 60%. I have a humidifier but cannot keep humidity at stable level...

Then your humidifier is probably too small. I use a 6 gallon & it's controlled by a Saturn 4. Ink Bird makes a $29 RH controller that you can set for the RH you want. It will turn your humidifier off & on so it stays close to the RH you set it for as long as your humidifier is big enough to do the job. You can pick up a used Saturn 4 for about $50 & they control heaters, AC, Co2, Exhaust Fan & RH. I love mine. Made life much easier when it came to climate control.

 

[Jack420]

Looking good in here !!

 

[Sativa1970]

Your Relative humidity ( RH ) is humidity relative to the temperature. Warm air holds more moisture. 78deg at 35%RH will be 68deg at 50%, if the water vapor in the air remains consistent.

It could also be the meter. A miscalculation of 4 degrees would equal the 10% RH loss. Set your meter outside and check the local current conditions to verify it is calibrated.

If you have confidence in your meter then your exhaust fan is exhausting the humidity a little faster than you are creating it.

What is your RH outside the tent?

 

[StrongZZZ]

Appreciate that. I due believe it's my RH, cause I am constantly refilling my humidifier. I turnt the fan down to 225CFM and I see the humidity automatically picked up. Thanks again

 

[StrongZZZ]

Hello there! Just wanted say to eveyone. Im new and a beginner. Please be nice Veg week 4

 

[StrongZZZ]

Then your humidifier is probably too small. I use a 6 gallon & it's controlled by a Saturn 4. Ink Bird makes a $29 RH controller that you can set for the RH you want. It will turn your humidifier off & on so it stays close to the RH you set it for as long as your humidifier is big enough to do the job. You can pick up a used Saturn 4 for about $50 & they control heaters, AC, Co2, Exhaust Fan & RH. I love mine. Made life much easier when it came to climate control.

It is very small for my 5x5 tent. 3 years ago when it was brand new it worked perfect. Just old age I guess. Speaking of old age, my hurricane inline fan 435CFM is acting like the motor is going out. It runs almost the same speed on high then it does on low. Does hurricane fans eventually go out over time? What's the life expectancy of a basic inline fan? My filter is a Phresh 450CFM. another question, does the fan have to have a higher CFM rating then the filter or does the filter have to have a higher rating? Sorry guys, just random questions.

 

[cjsbabygirl313]

Your Relative humidity ( RH ) is humidity relative to the temperature. Warm air holds more moisture. 78deg at 35%RH will be 68deg at 50%, if the water vapor in the air remains consistent.

That is weird - in my tent as the temp goes up, the RH goes down and as the temp goes down the RH goes up. Its ticking me off TBH! See what I mean:

Temp and RH

• cjsbabygirl313
• Nov 14, 2021

 

[Buds Buddy]

It is very small for my 5x5 tent. 3 years ago when it was brand new it worked perfect. Just old age I guess. Speaking of old age, my hurricane inline fan 435CFM is acting like the motor is going out. It runs almost the same speed on high then it does on low. Does hurricane fans eventually go out over time? What's the life expectancy of a basic inline fan? My filter is a Phresh 450CFM. another question, does the fan have to have a higher CFM rating then the filter or does the filter have to have a higher rating? Sorry guys, just random questions.

I would think the life expectancy would depend on how much hot air is being moved through the fan drying out the bearings & how often it's used. It's not needed as much in Veg as it is during flower. I'm not sure, but I think they design the filters & give you the rating of the fan size required.

 

[ppm Charlie]

Temp is between 68 and 78 and humidity is little harder to control between 35% 60%. I have a humidifier but cannot keep humidity at stable level...

If you are running LEDs you should probably run 80-85 deg F. HID or HPS 70-75 deg F.

 

[StrongZZZ]

If you are running LEDs you should probably run 80-85 deg F. HID or HPS 70-75 deg F.

Thanks...

 

[StrongZZZ]

Wht is the temp inside the tent during "daylight" hours?

76 to 82

 

[TwitchVee]

Hard to be nice when you bring me nothing to complain about or critique. Great job.

 

[Buds Buddy]

If you are running LEDs you should probably run 80-85 deg F. HID or HPS 70-75 deg F.

First time I've ever heard this. I don't think it matters what type of light you use. VPD is VPD & light doesn't play a role in that other than the amount of heat it puts out. 77 F with 60 - 70% RH is considered the perfect environment for growing weed during Veg no matter what light you use. 77F with 30 - 40% for Flower. However, a lot of us run lower temps in flower to bring out more Trichomes & Terpenes along with some colors. I flower at 75F until the last couple weeks & then my AC goes on 68F to bring out any colors.
I'm not sure I could even reach 85F with LED's in my tent. Not going to test it though... lol. HPS... I can get to 100F no problem. I'd only use HPS if I was growing in a cold shed, garage or basement.

 

[TwitchVee]

First time I've ever heard this. I don't think it matters what type of light you use. VPD is VPD & light doesn't play a role in that other than the amount of heat it puts out. 77 F with 60 - 70% RH is considered the perfect environment for growing weed during Veg no matter what light you use. 77F with 30 - 40% for Flower. However, a lot of us run lower temps in flower to bring out more Trichomes & Terpenes along with some colors. I flower at 75F until the last couple weeks & then my AC goes on 68F to bring out any colors.
I'm not sure I could even reach 85F with LED's in my tent. Not going to test it though... lol. HPS... I can get to 100F no problem. I'd only use HPS if I was growing in a cold shed, garage or basement.

I run an LED fixture in my 5x5 and it reaches well over 85f even with the driver outside the tent. Depends on your region. 68f doesn't bring out colors or help trichome production, it's your night temps that do that. or rather, the difference between day temp and night temp. My day temps usually stay at 79f-81f and night temps generally hover around 65f. Anything over 81F (strain dependent) runs a risk of melting your trichome heads or stressing them into going amber before they're ripe, leaving you with a full blonde head of hair on airy junk

 

[ppm Charlie]

76 to 82

I generally run 82-86 deg F. during veg and 80-83 deg F during initial flowering. Mid-flower around 80 deg F. Late flower 78-80 deg F. Week before harvest - stress them a bit with drought and 68-72 deg F.

Leaf surface temp is a very important thing for photosynthesis. If you search the web for: "leaf surface temperature studies of cannabis" you will find commercial LED light vendor infrared camera studies. Those studies compare the leaf surface temps of HID/HPS vs LEDs.

Growers get the good photosynthesis with HID/HPS at tent/room temps of 70-75 deg F. The cannabis leaf surface temp studies indicate growers need a tent/room temp of 80-85 deg F to have the same amount of good photosynthesis using LEDs. I guess it has to do with the light spectrum of HID/HPS vs LED.

All cannabis strains light intensity and temp dependent but, in general, that's the word..

 

[ppm Charlie]

I generally run 82-86 deg F. during veg and 80-83 deg F during initial flowering. Mid-flower around 80 deg F. Late flower 78-80 deg F. Week before harvest - stress them a bit with drought and 68-72 deg F.

Leaf surface temp is a very important thing for photosynthesis. If you search the web for: "leaf surface temperature studies of cannabis" you will find commercial LED light vendor infrared camera studies. Those studies compare the leaf surface temps of HID/HPS vs LEDs.

Growers get the good photosynthesis with HID/HPS at tent/room temps of 70-75 deg F. The cannabis leaf surface temp studies indicate growers need a tent/room temp of 80-85 deg F to have the same amount of good photosynthesis using LEDs. I guess it has to do with the light spectrum of HID/HPS vs LED.

All cannabis strains light intensity and temp dependent but, in general, that's the word..

My nighttime temps 67 to 68 deg F.

 

[ppm Charlie]

Those cannabis leaf surface temp studies were conducted without CO2 enhancement.

 

[TwitchVee]

I generally run 82-86 deg F. during veg and 80-83 deg F during initial flowering. Mid-flower around 80 deg F. Late flower 78-80 deg F. Week before harvest - stress them a bit with drought and 68-72 deg F.

Leaf surface temp is a very important thing for photosynthesis. If you search the web for: "leaf surface temperature studies of cannabis" you will find commercial LED light vendor infrared camera studies. Those studies compare the leaf surface temps of HID/HPS vs LEDs.

Growers get the good photosynthesis with HID/HPS at tent/room temps of 70-75 deg F. The cannabis leaf surface temp studies indicate growers need a tent/room temp of 80-85 deg F to have the same amount of good photosynthesis using LEDs. I guess it has to do with the light spectrum of HID/HPS vs LED.

All cannabis strains light intensity and temp dependent but, in general, that's the word..

Yeah I don't mess with ?CO2 until the last month and I like to tick my light up a couple ticks every few days towards the last several weeks to avoid the surface temp issues because I noticed it causes premature trich development if not undue stress. I'm at the 'work smarter, not harder' age and i'm definitely not gonna think about it.

 

[ppm Charlie]

Yeah I don't mess with ?CO2 until the last month and I like to tick my light up a couple ticks every few days towards the last several weeks to avoid the surface temp issues because I noticed it causes premature trich development if not undue stress. I'm at the 'work smarter, not harder' age and i'm definitely not gonna think about it.

Smart man!