Temps With 1500ppm Co2??

BTW, I think the best way to go on ac is to use a big window mount. I'm looking at the 24000 btu model at Home Depot for $500. I've never had much luck with the portables, even when I went to two of them.

My exhaust fans shut down 1 min before co2 is injected for 3 min. the temp runs in mid 90s
after 30 min. the exhaust fans turn back on. I do this 6 times in a 12 hour cycle. the plants thrive off this.

Got any finalized yield numbers or what not?? Especially in comparison to a non-CO2 grow in the same space...

born2killspam said:

Got any finalized yield numbers or what not?? Especially in comparison to a non-CO2 grow in the same space...

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i will in about 70 days haha

Was asking aes110.. I know this is your first go with this stuff..

i grew in 95 heat with 1500 ppm,s don't take it any higher as 1500 is apparently optimal

easygrinder said:

i grew in 95 heat with 1500 ppm,s don't take it any higher as 1500 is apparently optimal

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i have seen people take it up much higher.. the urban grower that runs around canada n the states shows peeps who routinely run 1600-1800 ppm

PPM is bound to be somewhat relative.. There is alot of room for error since its denser than typical air ontop of technical details regarding measurement.. 1800ppm on one meter in one room might read 1400ppm on another meter, or in another room with different air-flow etc.. A while back CO2 users were actually using 2000ppm as an optimal target.. Plants can still thrive even if its teetering the toxic level.. Should be noted though that actual toxicity levels will depend on the amount of light they get, and actually on O2 levels as well.. To a point anyways, there are limits..
I have a 32pg 1.9MB pdf that explains the limits on photosynthesis really well.. Anybody who wants it can pm me with an email adress that can accept that attachment..

i'd be highly interested


and i would think you can just upload/attach the file to here, born2kill

and btw flo...born2kill is right on with the ppm's argument


i have an article about it....even though its in relation to meters and such and not directly co2 meter...but its the same principle!

http://www.getbluelab.com/Support/Understanding+what+ppm+scale+to+use.html

the only reason i am running it higher is because of how stupid these meters are LOL

like when you turn it on and calibrate it, then unplug it and take it to your grow room, it resets, so theres really no way to calibrate it accurately indoors unless you have access to an open window..

and my meter runs about 100-150ppms above ambient (so when it should read 300-400 it reads 450-500

so i compensate by having the ppms at 1650-700

i guess i should have clarified earlier hehe

FLoJo said:

the only reason i am running it higher is because of how stupid these meters are LOL

like when you turn it on and calibrate it, then unplug it and take it to your grow room, it resets, so theres really no way to calibrate it accurately indoors unless you have access to an open window..

and my meter runs about 100-150ppms above ambient (so when it should read 300-400 it reads 450-500

so i compensate by having the ppms at 1650-700

i guess i should have clarified earlier hehe

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i dont think you are right about that...

some meters have automatic temperature compensation....

well i have the sentinel cppm1 and it says you should calibrate it before use, and that ambient air is 350-450 ppms.

i have had it outside on my balcony at night, about 50 degrees, as well as in my grow room at about 85 degrees, and both times the reader said around 450 ppms, but when i calibrated it outside, then brought it inside, it read about 383 ppms...

then when i unplugged it and took it into my grow room, it shot back up to 470 ppms. and i know that cant be true cuz my plants are suckin up the gas in that mofo LOL

damn bro...my fault


thas my non reading ass....

i thought you was talking about water meters

blah, i confused my own self

haha naw man my co2 meter

Need to read... all of this... later, subscribed.

What are your surroundings like? Do you live in highlands, lowlands, near roads/industry? Ambient CO2 levels can vary themselves.. Might be the actual concentration and not the meter that is off.. If thats the case then your compensation would be incorrect for your target.. Harmless, and probably the right thing to do though since IIRC you have an absurd amount of light..
I'll get that pdf sent.. If you or anybody has a means of hosting it, please do.. The forums won't accept pdf attachments that size though.. Been there, tried that..

i live about a quarter mile off of the beach, away from town, away from any type of industrial complex. i get a rough sea breeze all day every day, and ambient co2 levels at sea level are supposed to be 350 ppm roughly.. and id say im at sea level haha

but i do have 2400w enclosed in a 4x8 footprint 8 feet high, which is a nice amount of light so i dont think the extra co2 is gonna hurt my kiddos hehe

using co2 has increased yield by about 75% compared to a non co2 enriched room. Its amazing how fast they grow and
the amount they yield with co2

Not sure if this post is useless but my temps right now are 90-100 without co2. I've moved my non air cooled 400 watt hps 8 inches from the tops of plants and they are growing like crazy for an indica. I think you could easily grow at 100.f I do have fresh air coming in though.

Past 1600ppm is poisouns for plants. I'm sure they'll still grow though. Over 4000 ppm co2 is poison to humans.