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Dude, a PC case? Really? Do you really think you will get anything out of that setup? Are you that clueless?
How the hell are you going to check the pH of water with nutrients mixed in when most nutrients turn the water brown or black? Good luck...
This guy doesn't want to do research or learn, he wants everyone to tell him what to do.
Why don't you just do your own research and figure it out for yourself instead of coming in here and expecting everyone to do all the work for...
Hold the pot on the ground, grab the stem with the other hand and pull as hard as you can.
EC is essentially the same as TDS (well, TDS is based on EC, but lets not get into that now) and it is a measure of the electrical conductivity of...
600 watt HPS are the most efficient in terms of lumens/watt, so you would be much better off with two 600s.