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Is it possible to run c02 without a closed loop system?

It's working great! I settled on an 80gph which cycles my system twice an hour and lots of air stones. I'll update with pictured when I put it to use. :)

I am running multiple undercurrent and water chilled 8x4 tents under ... a lot ... of Vero29 Cobs. My water temps are consistently 65-70f but my air temps can reach 90f even with a huge duct fan pulling air out. For reasons I don't want to get into, I can't lower the heat in my otherwise very...

Thanks! I should add that I ran into some issues with this setup. With a 320 gph pump my water was changing over every 5-7 minutes. My design called for running the buckets in series and this lead to the first tank filling up while the last tank remained half full as the 1" passive draining...

So I am just about finished designing my undercurrent DWC system for multiple 4x8 tents. Parts list: 1 x 55 gallon barrel 9 x 5.3 gallon square black buckets w/ lids 15 x 1" double threaded bulkhead fitting & 15 x 1" pond hose adapters from Home Depot 3 x 1/2" double threaded bulkhead...

Yeah, you're wasting your time THIS time, as I already bought the drivers when I had a different design in mind, but you're not wasting your time for my next design for a bigger space. Which is coming real soon. Both you and MW have been a big help though. Your DIY gave me an idea of where to...

It's been 6 years since this original post. Has any of the conventional wisdom changed on RDWC feeding? I am building an undercurrent system and I've read a lot about the Lucas formula but can't help but feel the plants would grow better under something different. Is there anyone else who can...

8lb is 1386g/sq m. I'm going to say it's not possible. If you are pulling that from a 4x8 tent I'd like to know how. No disrespect intended.

Good luck getting 6-8lb in a 4x8 with any method. A proper led room SHOULD be way more efficient than any other setup. Check out growmau5 for his yields.

I don't think I'll need dimmer knobs. To my understanding the Vero29's run very efficient even at 80w. I was looking at some charts and apparently ~800PPFD is the sweet spot where diminishing returns start. Check THIS chart out. I dug up an LED calculator that someone had posted on rollitup...

I know, MW. Your advice has been valuable. I'm trying to dial it in is all. No lights will go to waste ... always more grow rooms. As for the driver I bought the kind with a third wire to fit your own dimmer.

My design is already for 2000w. I'm worried about bleaching the plants at 62.5w/sqft with the Veros. Without running CO2 it seems like a waste. Can you point me in the right direction as to dimmers? Any idea on the footprint of a single COB?

sixstring! I originally based my build around yours. Thank you for chiming in. I don't think I'll even need the fans with the custom aluminum heat sinks I bought. They'll act as a frame AND heat sink. I bought the fans as a backup only. I'll probably be using thermal adhesive in place of...

Err ... 1400mA and 2100mA.

So after much more research on COB efficacy I'm reading that 20-30w/sq ft is actually more than enough, and the latter sometimes too much light. I probably should have bought the 1.2mA driver but instead I chose the 2.1mA. As of now I'd be running the chips at ~80w, in a 4x8 that's 62.5w/sq...

By harness I ment the molex premade connectors. Pretty much what you're talking about. So again, the COMPLETED list of supplies for my LED build - 6 x HLG-320H-C2100B Mean Well drivers = $504.60 - 24 x BXRC-30E10K0-D-73 (Vero29 7th gen 3000k 38.7v) COB LEDs = $598.43 (3500k was unavailable...

Reading that it's not best to run them at full capacity. If I bought 6 of the HLG320H-C2100B drivers I'd meet my 2kW goal and be running them at 80%. To my understanding 50% is optimal. Thoughts? Will I burn them out at 80w per LED? I'd be totaling 320w per LED x 6 for a total of 2kW

Aww balls. I was basing those drivers off of another comparable build, although I guess he shot for 250w. I'd like to maximise it. I'm sure I can find a driver that will run them at 400w, yeah? As for the harness yes I can rig that up myself but I was referring to the LED harness.

Thank you!!! This was exactly the information I needed. So as it stands, this is my build: 10 x BXRC-30E10K0-D-73 (Vero29 7th gen 3000k 38.7v) $250 10 x BXRC-35E10K0-D-73 (Vero29 7th gen 3000k 38.7v) $250 5 x 709-HLG240H-C1400B (250.6W89-179V 1400mA IP67 CC 3 in 1 Dim) $320.50 5 x 4.850"x36"...

Great. Thanks for all of your expertise. Last question: Can I mix two Vero29 x 3000k and 2 x 3500k on the same driver, granted they have the same exact specs otherwise?