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Can't help you on the ppm stuff. I usually go mostly organic, and half strength my fertz until near the second half of flowering, where I increase to full strength. Its also somewhat strain dependent, so watch for nutrient deficiencies. Only reason I'm posting is to say 'looks great so far'...

If your experiment is to test the COBs vs HPS on flowering, the only thing that makes sense is to veg them under identical conditions. Otherwise, the test is invalid. Post your parts list for your COB build. I'm probably going to build one for next summer, and it would help me a lot.

Here's the more expensive stuff we use. I'm not suggesting anyone use this stuff - just posting it as a frame of reference. http://metrosupplycollc.com/owens-corning-703-fiberglass-acoustic-board.html

No nutes yet. Looks genetic. Is there a name for it?

Flipping burgers is not an easy job.

Any idea of what this is?

Foil backing is not intended to deaden noise. Its function is to maintain the integrity of the insulation, and is used on the outside skin, away from the source of noise. Layers of plastic in the HRV will act as a moisture barrier, but I question its effect on preventing condensation. I'm not...

Would a hot water heater running in your backyard attract attention? Almost certainly, because it's so unusual. I'm not sure anyone would put two and two together, and think 'grow room', but it would look odd. I think it also somewhat depends of the type of area you live in. Do people...

Good thread. I use this one, because I'm a cheap skate. Its the same old design I've been using for decades. https://www.amazon.com/gp/product/B005MMSTNG/ref=oh_aui_detailpage_o09_s00?ie=UTF8&psc=1

Thought I'd add my 2 cents on the insulation sound proofing question. I work in the fan manufacturing industry, and we mostly use fiberglass insulation to reduce noise levels, 1" to 2" (foil backed if it's on the outside of the fan housing). Most of it is loosely packed insulation, but we do...

Oh ya - wardens are complete dicks sometimes. I had one try to give me a ticket for no boat registration ON MY SAIL BOARD. Somehow I talked my way out of it. Once they wanted to bust me for OREGANO they found in my backpack during a camping trip. Another time I got a ticket in the BWCA for no...

Cops are people. Some of them are okay. Some of them are jerks. Power corrupts, though, so you've got to watch your ass. Know your rights. You don't have to answer their questions. They WILL try to convince you that it's in your best interest to talk. It never is. They'll say things along...

Now, now, now. Sticks and stones... You are a sensitive one, aren't you? Certainly nothing to prove about my claims of genetic importance, correct? Other than that, you are the one making a claim. One can not prove a negative, so the burden is on you. And please, stop making shit up...

I was thinking 6-8 oz, too

My phone's camera shows the tell tail lines under a magnetic ballast, while my normal camera doesn't.

I haven't grown since the 90s, when jack Herr, White Widow & Northern Lights were easy choices from seed banks in Europe. Now I'm back, and the amount of choices are driving me nuts. Too many choices have me in analysis paralysis. Help be find something exceptional. I grow with a 1kw HID (MH...

Why not just put a MH bulb in the Gavita? I skeptical that any 315w light has as much penetration as a 1kw HID.

I water until I get just a small bit of runoff. I use soil, and runoff is just washing away nutrients. You definitely want to fully saturate the soil, as more frequent intervals with less water will result in a dry bottom, and the roots don't go where it's dry. I think flushing is a bunch of...

No - you are doing it right. Don't start fully saturating until the plant is larger. I water in a circle around the plant.

Not sure I agree with you there. I mist my seedlings, and yes - I start them under a 1kw MH. No issues whatsoever. Only downside is the cost of electricity. Up side is that they get lots of light. You've got to know how to water, though, and misting is part of the equation. Misting anything...