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But Ampermeters with internal shunt should be already calibrated, or not?

Well, why not just add a simple 2A DC analog amperemeter to the linear pot!

And now I have a monkey on my shoulder screaming at 670nm :mrgreen:

In my book this also mean that plants can uptake more than a bunch of selected macro/micro nutrients...

This mean that weed can uptake lead, arsenic, cobalt, and nickel?

For what I know, you filter the water to remove the chlorine which is bad if you go full organic (if you are using chem/mineral fert maybe you can avoid that). But you also remove all the other stuff, so you must supplement cal/mag to your filtered water.

Not bad, and I can find Vero's family on Ebay in europe

I'm micro and stealth and I'm using the same kind of chinese LED used by the solutions you posted above, 66w total. I'm just not using that old red/blue spectrum, only white light. Still the heat is an issue if you want keep it silent and smell free. So I will start some test with COD led...

Well, my grow space is so small that DIY was the only option, the great guys who write in this forum section were truly inspirational.

ahhh, by the way.... my two cents for your next run, forget the SCRGOG and try LST. You can start LST earlier and is easy in such small environment.

Maybe you can try the Supercrop technique? I saw some supercropped autos around and they respond well apparently. Northen Light is not easy to handle in a standard grow room, with a PC you really have to train it hard!

Well Triplec, you're supposed to use the SCROG net to keep the plant down!

Now we have just one small problem, find this shit in Europe :mrgreen: