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What humidifier are you using? Anyone try or use one of these 12 head from house of hydro? http://thehouseofhydro.com/store/p88/12_Disc_Mist_Maker.html

What temps do you run and what humidity levels? I am learning about VPD and realize I am having an issue with to low humidity (room is ~2 weeks old in flower at about 50% humidity). I setup a humidifier yesterday to try to get it up to around 65 percent which is the low end of recommended for...

I tried getting my humidity up to even 60 percent and lowering room temp to 76 (low 80's canopy temp) but could not get the rh past 55 percent. I have a humidifier I am going to setup and use to get rh up to where it needs to be and see how things go.

I just looked up VPD, was not familiar with it.. very interesting and also tells me I am running my humidity to low. Been at ~50 percent rh with mid to high 80's canopy temps while running co2. Maybe I will lower temps a little and up humidity to 65 percent range.. don't want molds.. but also...

Ahh okay, thank you

The Enter drive efficiency in % for total wattage field, what is that exactly and what is the answer for 3590's 3500k CD bin 36v?

I was looking for the latest version of the diy cob calculator, I searched for DIY COB LED Calculator here in this forum no results for it, not on the first page anyways. Go to google, search same thing, first result in google.. why is that? I do have a question about the calculator though...

Just put in my order for 6 4 cob kits from timber.. these will go over 2 4 x 4 trays. I will put 4 cobs per bar (aluminum angle), 3 bars per tray, what distance should I have between them, 3 foot bar, cob on each end and spaced 12" apart for the other two?

From thread I linked earlier Ethylene ... A concern with high Co2, especially over ~1,000 ppm, is ethylene buildup. Even low ppm concentration of ethylene gas can affect flower (inflorescence) size, plant growth rate, seed set (for breeders), senescence, etc. If grow rooms or greenhouses are...

Yes that is one opinion and may be true, but there is also other opinions that differ, figured it won't hurt anything to vent once or twice a day as long as I filter the air properly going in and out. I just want it to remain sealed when not in use.. if air would travel through on its own when...

Yeah, like I mentioned earlier, would have two inline fans, one pulling from room through a can carbon filter going out and another pulling in outside air through hepa filter. I just want to be sure when they are not running that no air can go in or out through the inline fans, not sure how to...

I currently am running at 1500ppm, may dial it down to 1200 though and compare overall growth, see if I notice any significant change. I would rather not vent but figure I would rather be safe than sorry and as long as I filter the incoming air real good it should not have any negative...

Here is an interesting thread about co2 levels and talks about ethylene buildup https://www.icmag.com/ic/showthread.php?t=221893

Its a big room, 28 x 28 approx but only 28 mid sized plants total. I don't know if 15 mins once a day is enough, I could do it once after lights off and another before lights on or even mid lights on too. I am only 2 weeks into flower now (first run in this room) have not exchanged air at all...

I used blue planet high yield in my rdwc systems, very nice nutrient line, no complaints and very cheap. I use canno coco line now as I am not doing rdwc anymore but definitely recommend blue planet. Use code medgrower1 on blueplanets website for discount.

I was thinking of using a can carbon filter in the room, have it suck from room and blow out through the attic and attach a damper to the side wall going outside. Then having another inline fan attached to my hepa filter (looks like a can filter but its just a hepa filter) I was thinking of...

There really is nothing bad that can happen refreshing the air once a day after lights out as long as you filter from molds/bugs.. but there could be benefit from bringing in all new fresh air. Problem is you will find polar opposite opinions on almost every aspect of growing on forums/google...

I have central air, dehumidifiers and heat in the room, thermostat auto changes between heat and ac when needed.. dehumidifiers have been keeping it at ~50 percent, that is during 90% + outside humidity as well, so hopefully the environment is decent.. just want to get all new air in once a day...

I am running a sealed room, I am using a co2 generator. I want to exchange air once a day after lights out. But I want to keep room air tight when not running a fan to do this. How do I do the intake and exhaust and keep it air tight when not running (will run maybe 15 minutes a day when...

Most new growth seems to be looking ok, still have a bit of wrinkling on the one strain though, will go have a better look tonight after lights on.