Temperature & Humidity

[Dooby420]

Hello all! :)

Finally got my 400w MH set up ;)
I also got a thermometer/hygrometer
Right now I'm looking at about 84 degrees Farhrenheit and 40% relative humidity.

I'm not too sure, but I think its a bit too warm in here :2cents:
I have an exhaust fan right now but it really doesn't do much with MH going :rolleyes:

I'm going to install a window A/C unit in the next room, hopefully this will help cool things down a bit. ;)

Any tips about where my temp./humidity should be around? Or what else I can do to regulate things in the gro room?

Any help would be GREATLY appreciated, its too damn hot!

Thanks peeps :smoke1:

-DooB

[bigsmoker420]

84 degres isnt that bad u should be fine as long as it doesnt reach over that the ac unit sounds like a good idea u should keep the temp around 75 to 82 thats what i was told but 84 really isnt that bad for it

[CB]

84 isnt bad but with summer comes higher temps... can ya aim a fan at the light to help cool it?

what kind of exhuast fan are you using now and how big is ya intake?

when ya hit 90 it's time to panic for sure :eek:

grow on

[Dooby420]

I just have a standard oscillating fan blowing outwards in the rear of the room, I just now put another oscillating fan near my window and its gently blowing back and forth towards the light and the ladies ;)

Temperature has stabilized at about 86 degrees, humidity has dropped to 30%. :eek:

I have to rely on these fans right now but I will hopefully have my A/C unit installed tomorrow and I will able to place the fan in a way that it blows the cool air from the A/C into the grow room. 2thumbs

It's definately hot as hell in here for me and the light doesn't help matters at all :rolleyes:

I was thinking somewhere around 70-75 would be comfortable for me and my ladies :D

Thanks for the help guys

[Dooby420]

By the way I forgot to ask, is 30-40% humidity okay? I know I dont want it really humid but then again is there a limit to how dry it can be?

And another question, the grow room's walls are painted white so this should help with reflecting the light, right? ;)

-DooB

[CB]

sounds like ya dont really have an exhaust or intake right? just fans blow'n the air around?

can ya vent to the attic?

4x4 inch dayton to the attis with a 12x12 inch intake will sort it out :D

and as far as Rh goes i dont worry to much about untill flower...

few froozen jugs of water in front of a fan works pretty good as well ;)

grow on

[Dooby420]

sounds like ya dont really have an exhaust or intake right? just fans blow'n the air around?

can ya vent to the attic?


hehe Yes this is true, I have a fan in the grow room pointing out, and another fan directed towards the lights and ladies.:D

Unfortuneately venting to the attic can't be done :( I wouldnt even really call it an attic more like a crawlspace on the top of the house :rolleyes:

I will try putting some frozen jugs of water in front my "intake" fan and see what happens. ;)

Either way, temp has stabilized now it's just a matter of cooling it down a bit 2thumbs

Thanks again :)

[wakka]

I have read where plants use light efficiently when it is in the eighties. I keep my temps around eighty one. kind of like a warm summer day. I drop the temps a little towards the end of flowering as if it was getting toward the end of summer, beginning of fall.

they seem to like it like that.

[Cranky]

heres a thought for peeps without venting and what not that are having probs with heat..

flower at night with big lights and use floros to veg with by day;)

can be slap bang in the middle of summer and ya can get away withit:)

cranky

[Dooby420]

Okay today makes day 15. :D

Last night I ran the light all night and this morning I checked the temp and it was a blistering 92 degrees :eek: :eek:

So I turned it off and put the girls in the dark room and right now it is a comfortable 83 for them. :cool:

The bad part is now I'm definately gonna need that A/C unit :mad:

Should I put the fan directly on them when the Mh is going or have it go back & forth as it is now?

-DooB :rasta:

[ZenLunatic]

Hey Doobs... any chance you can get another fan in there? Why not cover both? Have one small fan blowing directly on the bulb to carry the heat away and one blowing directly on the plants... cover both bases...
Same way we go about it here since we don't have the luxury of an air cooled hood....

Cheers and good green mojo flyin at ya...

zL

[Dooby420]

Hey Doobs... any chance you can get another fan in there? Why not cover both? Have one small fan blowing directly on the bulb to carry the heat away and one blowing directly on the plants... cover both bases...
Same way we go about it here since we don't have the luxury of an air cooled hood....

Cheers and good green mojo flyin at ya...

zL

Hey Zen,
I have my "intake" fan oscillating from the plants to the light and back. I am scared of putting it directly on the plants they are still very lanky and they flop around when the air blows on them directly :(

Hopefully the stems will thicken up but its been a few days with air hitting them and no real change :mad:

[ZenLunatic]

Won't be long before the stems thicken up bro... usually notice a difference after roughly 7-10 days here... And just to clarify (my apologies, still working on first coffee of the day) I meant one directy on the bulb and one for the plants... but keep it oscilating, you're absolutely right there. Keep that air circulating. :D

[ice#1]

if you add co2 then getting into the lower 90's won't be a problem either i've heard that adding a wet towel helps raise the hum.

[Dooby420]

I think the heat is finally taking its toll on the girls :mad:

Right now it's about 83 degrees, been in the mid-to-upper 80's for most of the day.

This afternoon I checked on them and two of the girls leaves were kinda drooping towards the ground.

Looks kinda like heat exhaustion to me but who knows.

I know they're not thirsty because the soil is still nice and moist so it has to be the heat right?

Thanks peeps

-DooB :rasta:

[TheStickiestofTheIcky]

The temps in my room have never been under 80 when the lights are on and sometimes as high as 90 with no probs. I might look for some other possible causes.

[CB]

Looks kinda like heat exhaustion to me but who knows.

I know they're not thirsty because the soil is still nice and moist so it has to be the heat right?



dont think it's heat at those temps....

are ya let'n the soil dry out? from ya pm and what ya post i tend to think over water maybe?

grow on

[Dooby420]

dont think it's heat at those temps....

are ya let'n the soil dry out? from ya pm and what ya post i tend to think over water maybe?

grow on

I'm not sure bro that might be the cause

I check the soil before I water and give them a little bit if the top of the soil is dry

I think I might hold off watering and see what happens :)

-DooB :rasta:

[ice#1]

how often do you water

[Cranky]

over watering=leaves will claw under(leaf tips will curl down/under)

under watering=leaves will droop,pliant will look limp.

cranky

[Dooby420]

how often do you water

ice - I usually water about every 12 hours or so, the top of the soil is usually dry every time I check between 12 hour intervals.

cranky - I am really starting to think I am overwatering since the plants are not really "limp" but the leaves do curl towards the ground but the plant is not like falling over :(

Last night only 2 plants were effected but this morning another one started doing this so its starting to freak me out a bit :eek: :eek:

I have not watered since yesterday afternoon and I think I'm gonna hold off watering for today and see what happens :rolleyes:

Thanks guys

-DooB :rasta:

[dredank]

that sounds like you might be watering abit to often. Might want to try waiting untill most of the soil is dry before watering. is the bottom of the soil/pot dry?

peace

[CB]

ice - I usually water about every 12 hours or so, the top of the soil is usually dry every time I check between 12 hour intervals.

pretty sure ya love'n em to death dooby

let the soil dry out to the bottom of the pot before ya water again... could go 2-3 days without watering depending on the plant size and pot size and soil ect.

last grow my plants where over 4 foot in 1 gallon pots and still only watered every 48 hours up to harvest

5 gallon buckets will let me leave town for a week with no worrys ;)

water untill ya get like 10% run off out the bottom then let it dry out 2-3 days before doing it again.... this will make the roots go and search it out and make them grow rather than not have to do anything at all.... heallthy and happy roots now will make you a happy smoker later

grow on

[Dooby420]

omg almost all my plants are becoming this way :mad: :mad:

I still haven't watered them in hopes of fixing the situation but it doesnt seem to be helping :(

Temp is 78 degrees right now with 33% humidity

Would placing them too close to the MH cause this problem or is it just overwatering?

-DooB

[Cranky]

yo dooby,ill over water 1 of my bb's tonight and will post a pic up...if your leaves are doing the same as the over watered BB then ya can stop sweating and just leave um to it for a few days;)

lights on at 8.30pm...they only just went off so we got a bit of a wait yet;)

until then

cranky

[Dooby420]

thanks cranky bro i really appreciate it 2thumbs

[Dooby420]

Alright today is Day 18 the plants look like hell :( :(

It's been almost 3 days since I last watered, but they still haven't looked any better... I figure maybe I should give them a drink a see what happens? The soil looks and feels dry as hell so I dunno :rolleyes:

Here are the plant conditions:


They are still in 20 oz cups, its Day 18, so maybe time to transplant?:rolleyes:
They sit approx. 1 foot away from a 400w MH
The average temp. is about 84 and average humidity is about 35%
The plants have air flowing over them via an oscillating fan
They were watered approx. every 12-18 hours before 2 1/2 days go, in which case they haven't been watered :eek:
They were receiving 18 hours of light but I recently cut it back to 16 to save on energy and help with maintaing proper temps. :rolleyes:


I also had another thought, the cotys are starting to turn yellow a bit so maybe time to give them a bit of fert? :hmmmm:

Thanks for all the help guys 2thumbs

-DooB :rasta:

[Dooby420]

WOOT today is Day 20 and they are starting to bush out nicely :)
They are a lush healthy green and looking great :D

I finally got the window A/C unit installed, quick question though:

Both the A/C unit and 400w MH are standard 3-prong adapters that plug into the wall.
The A/C unit has a fan that runs continuously (or until turned off) and a compressor that kicks on/off on its own depending on air temp.

When the compressor kicks on, it pulls some extra power and for a split-second my MH dims out and then its okay. The A/C and MH light are plugged into different outlets but they are pulling from one circuit (same room).

I dont know too much about electricity so my question is will this do any damage to my light system/AC unit/circuit breakers or fuse box? It's kinda got me worried :rolleyes:

Thanks all

-DooB :rasta:

[WilliamClarkeQuantrill]

It is defenitely not a good sign, but its not really the end of the world either. As far as damage to the light system, with metal halides it is surely going to shorten bulb life. Towards the end of the bulbs life the dip in voltage might be enough to make the arc go out as well. Concerning the a/c unit, over time the slight amount of extra amp draw as well as heat resulting from the voltage dip at comp. start up will have some negative effect on comp. life. However both are somewhat minimal and often overlooked as a true problem. Its really quite common.

You should make sure all connection points are tight and not gettign warm on the power supply cords. Do away with all extension cords. you might even feel the breakers plastic face to see if it is getting unusually warm to the touch compared to the others in the box.

Just keep a constant watch on all the electrical connection points over the long haul and you should be able to catch any real problems before they cause any dammage.



toke it easy :smokin: