Humidity seems high at lights out
- Thread starter Skoal
- Start date
YisusPlant
Member
I'm just wondering, also very baked... I feel I'm having problems with the humidity. I actually could fix it a little with an electric heater (I don't really like to use it). The normal RH I have is 52%-64%. The plants are in the last days of 3rd week 12/12. With the heater on is around 40%-45%, what is sweet xD... I would like it even lower just because I read somewhere if you keep it around 35 45 you got better buds. I'm also using the heater while the light is off and I wanted to know what could be the problem of having warmer nights than days. (The range of temp is 21-27 C. )
Just trying to find out what others think, is my first grow and I'm doing for myself and to enjoy it but I would like everything going optimal... I hope I find you with time to answer =) I did many mistakes already and probably it will happen more times (I'm already worried about how the drying and curing will be... I really don't wanna fuck up xD)
nobighurry
Well-Known Member
I try to keep my night time temps within 5-10 deg if I don't run a dehumidifier or humidity raises significantly, if water vapor stays the same and temps drop humidity raises, colder air doesn't require as much moisture to become saturated as warm air, you want lower night time temps to bring out the colors and increase terp, plants respond positily to cooler night time temps but to much temp variation can cause issues I with indoor grows IMO
With lighting being adequate to begin with....the effect warmer nights, as compared to day (lights on) temps, will have, is less stretch of your plants. Vice versa, having cooler nights to days will create more stretch. The greater the difference, the more it will stretch, or not stretch. Naturally, temps are cooler with lights out, and humidity should be higher as well compared to 'daytime'.
YisusPlant
Member
thank for the answer blitz,
I'm not so baked now xD
and after the stretching finishes? (during bud formation time) is it too bad to have higher temp during lights off than lights on?
I have it set from 7 pm to 7 am to be the lights on, and always before to sleep the RH is also higher than in the mornings... when I wake up is around 55% - 23º (like 9 am, 2 hours after the light turns off). and while I'm here it gets warmer and lucky me if the RH goes under 50%.
I read before that it suppose to be very good to have very low (35%aprox.) RH during the last 2-3 weeks of flowering,
I got the VPD photo. I'm not so far from there xD
like I said, is my first grow so more wondering than actually knowing xD
Attachments
DailyBlastin
Well-Known Member
if you'd like to lower the volume of the air movement sound you should look at insulated ducting, i know the hardware stores sell 6inch insulated duct, im almost certain i havent seen pre-insulated 4inch at the hardware store but you might be able to find it online or you can just buy the insulation sleeves they sell at the hardware stores for 6inch ducting and cut it lengthwise so you can wrap it tightly around the 4inch duct, then duct tape or ziptie it in place. another thing you may way to consider is a true variac controller, alot of times the noise people think is from air movement is infact because of their crappy rheostat-style speed controllers, those controllers are complete junk, they function by quickly switching the fan on/off repeatedly to meet your desired "speed" this process will infact burn your fan out much quicker than it otherwise would, and as a by product the air whoosh sound is actually from the fan starting back up at full speed then being shut off constantly, the only proper way to control fan speed is with a variac controller which allows you to set a constant voltage at which to run the fan, so while full speed may be 120v you could set it to only get 60v constant and thatd be 50% speed- when i made the switch to variac controllers i discovered i didnt even need duct insulation, properly regulating the fan was enough for whisper quiet operation.
Last edited:
It's not an issue during mid to late flower to have temps 'backwards'..meaning higher during lights out. At the initiation of flowering...warmer nights help initiate flowering, but after your stretch is done and heading into the final phases...it wont have too much of an effect. To avoid any confusion in my explanation...here is a link that may help you....https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3935576/
coreywebster
Well-Known Member
There's a difference between absolute humidity and relative humidity.
RH goes up because temp goes down, doesn't mean that there is suddenly double the amount of water in that space.
RH goes up because temp goes down, doesn't mean that there is suddenly double the amount of water in that space.