Anyone do a dwc under a diy light yet?

Was wondering if anyone has done a dwc grow under a diy cree cob light yet. I was reading on another site and seems ppl were having problems but I dnt think it could be the light.

It's not the light lol, it's the absence of heat. Got a friend that RDWC and he switched to cobs and is now switching to coco

What kinds of problems? I would think that the lack of radiant heat is a good thing, helping keep rez temps down easier? I'm interested in DWC, but without a chiller I won't do it.
I always thought/think that undercurrent, led, and sealed CO2 would go great together.
I'm going to work on a new nutrient mix this round and see if I can settle some lingering slight issues. Lowering K and upping P and Mg.

That's what I thought, keep the rez temps down so I don't understand why people are having issues. I wanna try a dwc but not if its not going to work

I am doing it currently and the combo works fantastic together. Defiantly need a dehumidifier though cause of the evaporation.

RM3 said:

It's not the light lol, it's the absence of heat. Got a friend that RDWC and he switched to cobs and is now switching to coco

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I would think coco would be a bigger struggle than DWC. With its tendency to hold on to water.
That is the problem I have in the area I am at now with low temps. It takes a very long time for coco to dry out and can't feed as often as I would like

Greengenes707 said:

What kinds of problems? I would think that the lack of radiant heat is a good thing, helping keep rez temps down easier? I'm interested in DWC, but without a chiller I won't do it.
I always thought/think that undercurrent, led, and sealed CO2 would go great together.
I'm going to work on a new nutrient mix this round and see if I can settle some lingering slight issues. Lowering K and upping P and Mg.

Click to expand...

Everyone that I've seen says it looks like a defficancy they can't pin point

Old picture. You are correct though without a chiller don't even start root rot is killer man.

licoricetree said:

I am doing it currently and the combo works fantastic together. Defiantly need a dehumidifier though cause of the evaporation.View attachment 3684148

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Are you vegging with the blur pls led and then flowering with the dot because I've only herd of issues when it's dwc under diy

licoricetree said:

Old picture. You are correct though without a chiller don't even start root rot is killer man.

Click to expand...

I would argue that to chill or not all comes down to your location / situation.
Large volume of water better and get rid of that POS "commercial" hot ass air pump heating your system up.

Look - NO Chiller!

Did last grow under a DIY light. No deficiencies under the light at all.Currently working on a 16x 3590 for a 5x5 room. Sold my kind l600 and advanced 600 both garbage lights.

OneHitDone said:

I would argue that to chill or not all comes down to your location / situation.
Large volume of water better and get rid of that POS "commercial" hot ass air pump heating your system up.

Look - NO Chiller!
View attachment 3684151

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Ya i agree it is location 2 like concrete in basement stuff like that. Just as long as you can keep water below 70 you should be ok.

@churchhaze doesn't use a chiller (I think). Synthetic only. I have ran synthetic RDWC with a chiller. Works very well under cobs.

My temps were fine, but at some point people need to think about using creative strategies to get away from the HID mentality that represents the standard go-to solution. Maybe 500w of cobs in a 4x4 doesn't need the same 250-300 CFM exhaust the HID needed. Think about raising temps while also using less energy. Perhaps even locate the exhaust at ground level and intake at the top. It goes against the natural thermal pathway but if it takes less energy and produces the desired temps, it's not a problem it's a solution.

IME, chiller >> no chiller.

Set out a bucket of tap water and see how fast it climbs to 70. If it never reaches or stays at 70 you'll get by, if it goes beyond about 70, you might consider a chiller.

Once those roots take hold, buckle up for explosive growth.

COBs work great over DWC from what I can tell.

OneHitDone said:

I would think coco would be a bigger struggle than DWC. With its tendency to hold on to water.
That is the problem I have in the area I am at now with low temps. It takes a very long time for coco to dry out and can't feed as often as I would like

Click to expand...

A friend of mine had the same problem and now he is switching to a RDWC system.

@CannaBruh you are correct about the explosive growth with cobs.

I've never tried using a chiller before so I don't know much of an improvement I'd see. I can tell you that the only times I've ever gotten root rot is when there was a confirmed problem with the airpump/airstones.

If the temperature of your grow area is in check, there's no reason why your water would be hot.

Not low temps...but lower temps.
If your temps are low...then there is your issue.
If your temps are high...there is your issue.
But using lower ends of the temp range, say 76 instead of 80, plus the lack of radiant...there is your led climate difference.
The goal is there for you temps in everything, ambient, rez, leaf. Whatever it takes to maintain those thresholds, is up in the air and up to the user. But the goal is to keep it in the range, not to use to a chiller or not. So who cares about that...we are talking about performance in a dwc system.

I have never had major issues with any medium and a deficiency...soil, coco, rockwool, coco/soil, even short term dwc vegging(never flowered dwc). I do think that I'm not getting everything out of my plants...but hey are in no way lacking or outright deficient. Especially since mixing jacks. All I think when I hear of nutrient issues is...that company got you with their "proprietary blend of secrets".

What I want to improve myself is getting beyond Mg(not walking the line of not enough) and possible P defs in coco specifically. What I have been seeing for years is purple petioles. It could be Mg related, but P is also a possibility. Like I said I don't think it is major, and don't know if it a problem or just genetics. But I get purple petioles and have never been able to shake them. So now I'm going to try to change my mix substantially in those areas.
Or I could be fucked and it's an antagonist effect I'm missing...high K?
Testing is needed.

If coco is too wet, use smaller pots until the plants are large enough to drink the watering up before it goes stagnant. Also, coco hold a shit load of water. I squeeze that shit until it is fluffy dry (still damp as fuck though) and then pot in that, not packed down or compressed, nice fluffy damp coco. Too wet = no O2 = why the hell are you using coco.

COBs do put off heat under the LES... put the backside of your hand or face under one, it's warm.

I Ran 960 watts of vero29's with a 13 gallon res. Check it out

https://www.rollitup.org/t/the-dawg-fathers-diy-vero29-960-watt-5x5-scrogg.897056/