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Air Temp disparty (night vs day)

downhill21

Well-Known Member
Still working out the quirks of my new 8x8x8 closed environment grown room. Soil (Roots Organic original), 1000 watt HPS in a 48" Vertizontal reflector, CAP 4 controller, bottled co2 (still new to me), no changes in nute regimen from last, dialed in grown room (roots organic liquid line).

When the HPS comes on the room comes up to about 81F, which I think is just about where I want it, but it gets down to 65 or so when the light is off. I'm seeing some real stretch in the plants which I didn't see in the last room. Lots of space between nodes. Flowers themselves are just as big as last room but the new room seems to have fewer flowers in a cola...that "spiral" of flowers up the last 8" rather than a big fat, flowers all the way around cola that I had before.

This is a SOG application, so plants in the same room may be 60" tall (inc smart pot) or 30", depending on age / stage of development. Thus it's tough for me to raise and lower the reflector. Adding pulleys / yo yos would also rob me of about 6" of vertical growing room, so reluctant there as well.

I don't yet have a co2 sniffer / monitor so I'm relying on the chart to dose the right amount of co2. (the last grow room had no co2 but was constantly refreshed with outside air). This room is CGE....no ventilation. I'm still sealing up the room to reduce co2 consumption. 5 fans, inc one sweet ECOplus 16" reciprocating wall mount. They go 24/7.

Changes from last environment:
Flower Room 1: constant fresh air from outside, 600 watt HPS, no environmental controller, 2 fans (none reciprocating), sealed reflector with lamp heat vented outside. This reflector also stayed in place....no moving it up and down base on plant height. 4x8x6 closet, closet door often open to help moderate temps. I don't think I recall whether fans went off at night or ran 24/7.

Flower Room 2: 99% sealed environment, 1000 watt hps, 48" open (not vented) vertizontal reflector, bottled co2 shooting for about 1100-1200 ppm, 5 fans running 24/7, no ppm sniffer.

Lastly, as I've gotten used to the co2, I've run out on occasion. When this happens, I open the grow room door and blow conditioned house air into the room until I refill co2.

Thanks for your help, guys. I've gone from 2-2.5 ounces dry of Sour Diesel #2 (Humboldt seeds) to 0.75-1.25 ounces dry with this flower room change. I imagine that ultimately this room will outperform the last, but working out the kinks is painful.
 

vostok

Well-Known Member
Leave the c02 out of the equation untill you have everything dialed in correctly, add the c02 in amounts easily managed, and 'OBSERVED' from memory you are looking at 70ppm, look to reducing your temps further, and introducing some 'blue' light to reduce stretch, etc by adding some Mh light ....some how ...lol
 

SnapsProvolone

Well-Known Member
Drop a space heater in the dark cycle. Enough biomass and temperature drops will cause RH to spike while limiting dehumidifier efficiency. Powdery mildew would show up in that case.
 

downhill21

Well-Known Member
Leave the c02 out of the equation untill you have everything dialed in correctly, add the c02 in amounts easily managed, and 'OBSERVED' from memory you are looking at 70ppm, look to reducing your temps further, and introducing some 'blue' light to reduce stretch, etc by adding some Mh light ....some how ...lol
You really think 80-82 is still too high? I had no idea that blue light reduced stretch. I hear ya on the "some how," but I'll come up with something somehow. Lastly, if I do w/out the co2 for the time being, the only source of "fresh" air will be leaving the door open to the grow room and blowing it in from the rest of the basement. I suspect that the furnace and water heater exchange enough air with the outside that this basement air may be co2 rich enough but what do you think?
 

downhill21

Well-Known Member
Drop a space heater in the dark cycle. Enough biomass and temperature drops will cause RH to spike while limiting dehumidifier efficiency. Powdery mildew would show up in that case.
Definitely gonna throw a space heater in there for the night cycles. My controller doesn't have a "night device" so I'm going to have to throw that on a thermostatically controlled switch. Unlike everything else in this hobby, space heaters are cheap and easy found at thrift stores and such (where I find myself doing a lot of shopping lately). My RH is on the high side of OK too at about 60. I'm thinking I'd like to reduce it to 50-ish. Thoughts? No dehumid right now but will be picking one up soon. I'd read that RH wasn't as big a factor as temp, light, etc so it's not been my first priority.
 

SnapsProvolone

Well-Known Member
Temperature also affects humidity thus making it a critical factor. If your at 55% @ 80 degrees and temperature drops to 75 degrees your humidity will be 65%.
 

vostok

Well-Known Member
If you own the place do as you will ...! but if you are renting look to buying a used door and affixing vent gear to the door, passive inlet at the bottom, hot air pumped out at the top, but yeah correctly dial in everything first, as c02 used in big grows, is very expensive, I no longer buy in c02, prefer the burner or even just talk to your babes is enough for me
 

downhill21

Well-Known Member
Drop a space heater in the dark cycle. Enough biomass and temperature drops will cause RH to spike while limiting dehumidifier efficiency. Powdery mildew would show up in that case.
Provolone, I found a Lasko reciprocating, thermostat-controlled tower heater on Craig's List for $30 and I'm diggin it. I imagine I see an improvement already...some foxtailing I've not seen in a while. The sucky thing about such changes is the waiting period to see if I'm moving the dial in the right direction or not, and by how much. Patience was never my strength.

Gonna pull out the "window mount" type a/c I built into the room and replace it with an electric dampened vent arrangement...see how that rolls for awhile. In a few months it's gonna get much hotter than it's been here, and I'm looking forward to how that dynamic plays out. If it gets too hot, I'll have to either move a helluva lotta air, or I'll have to dual-hose portable ac it. I'm too small to spend the cash on a mini split. My temps currently have been up at night to 70 and down during "day" to about 78F, so I think I've got both the spread under control and the peak temps. If any of you are still reading this, your thoughts on where the temps are now, por favor?

Next, and last (I think) essential task is to better light and air seal the door into the room. Currently light leaks out all around it and I'm sure I lose co2 too (though I'm not currently running it). Oh, and I will get a co2 meter / controller....maybe May or June.

I'm going to run a short garden hose from a washtub with threaded spigot to a Little Fuck water filter (or whatever it is) so I no longer have to fill gallon jugs and let them sit over night to evap any chlorine (we don't have the other, more problematic chloromine or whatever they call that chem). Put a watering want on it and save myself some time. Any ideas on how I adapt this to feeding them? I'd like a system like they use at carwashes, that injects the cleansers into the water midstream, drawing them from wall mounted, inverted jugs of soap that screw into the dispenser. A good DIY design would be perfect as I'm handy and like free, or at least cheap.

Thanks for your help guys. I hope these questions aren't already out there and I'm wasten your time. Please tell me if so. I did search. Bon vivant!
 
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