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before I do this, is it actually a good idea?

If you have a densely packed jungle it can be worthwhile, but not in your case.

it wasn't actually my light. Just a similar one. My light is a ISH170. Which is i think is basically the same as the newer ish150v. The two boards are ISH150. Slightly bigger than the ISH120. My driver is ELG-150-C2100-3Y

I have a LED board like this with a non dimmable 150w driver. Each board is 85w. Can i simply add two more boards, keeping the same driver? Sharing 150w between 4 boards instead of 2? And if so, it is there a noticeable efficiency increase?

No. You calculated the probability that a given 6 in a row would be male. You neglected the 7th event. But more importantly, you need the probability that any 6 of the 7 would be male. There are 128 different possible combinations of 7 seeds. From 7 males, to 7 females, to everything in...

three scope 75 strips, and two ish150 boards, in a tent 120cm x 90cm.

I have one of the basic LEDs that are supposed to be fine with no heatsink, but I would just prefer if it were cooler. Is it worth adding for example various heatsinks from computer parts to the top of it. Obviously the heatsinks designed for such boards is an option but then you are defeating...

completely submerge it in water and keep it there. changing the water every day for a while.

The sensible route would be to chuck it. Personally I would cut that cola, or else it will spread. then excise the worst part and water cure the rest. But I'm not sensible.

I have Neemazal T/S which is 10g/l azadirachtin. I believe this is pretty much the same as Azamax? I am not sure if i have root aphids, but I have had them in the past and want to prevent them. I don't even know what language the Neemazal instructions are in.

rapid rooters would be best. All mix is possibly a bit over fertilized for this stage. Probably would be fine though.

i have placed cuttings in brown beer bottles of water. Replacing the water every few days, and it just works. Probably slower than other methods, but it still works.

how do you know how much light to give early autos without overdoing it or simply wasting electricity? I have a couple of 30w 6700k CFLs. I could use a 150W HPS but 98% of the light would be directed to the soil so it doesn't seem worthwhile. With photoperiod plants I woudn't be bothered, but...

That is not a proper extraction fan. Really that is a duct fan. Quite loud too. Black Orchid have some perfectly good proper fans. But they will be more expensive. also consider getting bigger than you need, and using a speed controller to slow it down. This is how to achieve really low volume

most led lights have red and blue diodes and end up producing purple light. White light has all colours of light. no problem

no they dont

surely the issue of which best reflects the light is easily settled, and there should be one clear answer. My vote is for white btw.

it has the amount of watts that i want to be using, and is fanless,which i like. But i dont know how well the leds compare to others in its class. https://supergrowled.com/product/fatpharm250/

this flea stuff is made by bayer none of this stuff is available as it is banned.

mostly an alcohol solvent