Less heat or more light?

78 is supposedly the ideal temperature. I have seen pot grown at higher temps and there were definitely issues. The grower thought everything was just fine. Of course, alot of people grow at higher temps and think it is "just fine". Well with the type of genetics we grow, yes its still going to be good. If you dont think your crop is taking a hit because of higher temps then you just dont know.

I disagree with "plants stop growing at 86°". They require more co2 at higher temps but I had a run where my temps were 84-88 a whole cycle and the results were still better then average. no co2 added. Its going to be dif for dif strains but id say 90 without co2 is pushing it. Id drop it to 300w. Your plants may look ok for now but I wouldnt risk heat stressing them over a extra 100w.

I stay between 75-79 lights on and 70-68 lights off now and my girls couldnt look happier

buy some dry ice or make a CO2 generator out of some yeast and sugar and 90's isn't a problem. well i should only say that as long as your closet it sealed you say that you have an intake and outake fan...is this passing through a hood? or just the room? if you're venting the room than c02 isn't an option.....but not only would co2 let you run higher temps but it would also increase yeilds.

yea Co2 is a option and can really increase yield .. atlest it look like it at the pics I have seen (no experiance here)

but be carefull .. dont run it in your bedroom Etc.

I have my grow room in my appartment .. so for me its a no go (just my oppinion) but I wouldnt bother .. Ill use the time/work/money on a cool tube or AC insted ..


BTW
Im working as a metel worker/welder and have for the last +20 years .. so I could have realy easy and cheap acces to Co2 tanks and all the ventils and stuff that follows ..

I think I am just going to play it safe on this one and run at 300w. I am really low on medicine and would hate to have to start over. After this grow temps should cool down enough in my area to use 400w and not be so hot.

Originally Posted by mnmobbin

I disagree with "plants stop growing at 86°". They require more co2 at higher temps but I had a run where my temps were 84-88 a whole cycle and the results were still better then average. no co2 added. Its going to be dif for dif strains but id say 90 without co2 is pushing it. Id drop it to 300w. Your plants may look ok for now but I wouldnt risk heat stressing them over a extra 100w.

I stay between 75-79 lights on and 70-68 lights off now and my girls couldnt look happier

Yep, this right here. They will grow below 90s and they will finish with good smoke at the end. But you run that same strain over again at the proper temps and you will see the difference. The plants will be much happier and happy plants is good.

watch your crop closely and you will find that if your temps are in the 90s F your plants wont put on much new growth when the lights are on but grow alot by the next morning. although they look healthy, they are mearly staying alive in the higher temps and then producing new plant matter with the cooler temps at night. it really shows up outdoors. proper temps=constant growth=higher yeilds

oh, also, a sativa dominant strain will put up with much higher temps than an indica dominant strain. can't remember what you're working with, but if it's sativa 90 degrees during veg really isn't going to mess with it.