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Flowering clones will grow all kinds of weird shit for a while. It's pretty funny.

I've read this before. How is it supposed to be done? Everytime I grew in coco it's roots all the way to the surface... Seems hard to take a sample. Especially one that would represent the whole medium.

Yeah, cobs are smaller -> narrower light beam -> must be run higher up. If you make the light emitting surface smaller you have to move it further from the plants. Otherwise you just light a part of the canopy. If you make the emitting surface larger you have to move it closer (unless you have a...

Yes.

You are free to continue being clueless. I'd suggest you don't, but it's your choice. If you do wish educate yourself, you could start by figuring out why 100k lux hps is quite a bit less light than 100k lux of white led. That's easy.

Your posts are so filled with misunderstanding and just plain wrong, that it would be way too much work to do... You should do the work yourself if you are interested in knowing what is true.

You, you are wrong. Go and read up.

You seem to know very little about light and even less about lighting technology.

^green promotes leaf expansion, right? Obvious benefit for leafy greens.

The sun is 0.5 arc degrees on the sky. It's small. The same apparent size as the moon. You can strech your arm out and still block the moon with your thumb. You could do that with the sun, but like you said: better not try it. A small soft box, like the one you posted, placed at about a meter...

^ the sun is a point source on earth, but the sky provides diffuse light.

Didn't read every page so not sure if this was pisted already, but I'm just going to do it. Here's some european oi!

Pretty low efficiency. CRI probably doesn't matter much. Not enough light for your area... enough for a 2*2 maybe.

Air pumps are noisy. No way around it. They are all noisy. And more noise from the airstones and bubbles. You can build an enclosure for your pump and reduce the noise and you can make your buckets quieter by adding mass (lower resonant frequency). Still pretty noisy. Too much for me even though...

No. The 28.5cm*44cm and few mm thick aluminium boards are all that's needed. Yes, they take up a lot of area, but I'm fine with it.

Mass of the heat sink doesn't dissipate heat. The surface area does. Why cram the diodes and spend money on big heat sinks when most of us don't want hot spots anyway? i've show these boards many times, but these four boards run at 80w each. Each has 308 diodes and they have no additional heat...

I would like to know the difference between 301h and 301b. Please explain.

Fify

Yes, if you fix the problems and let it grow it will be just like a plant that was healthy from start. Sometimes fixing things and letting the plant grow takes so long that it makes more sense to start over.

Quite possible. I once had a tray of cuttings for four weeks and nothing happened. Then I realized they were in quite cool spot. I moved them to ~24c and most rooted in less than a week.