I just got done looking over your grow, this is wonderful!
Running 240 to lower the amps is a great idea, I guess having a elec. license paid off in the end huh?
I'm still not 100% sure how to run the 240 but it sounds relatively simple, and I can do some research on that when I run my own room.
My real question is about your sealed room. I understand it's fully sealed, with the ventilation only going through the lights, and you have a carbon filter. But I was under the impression that you wanted to pretty much dump the air contents of your room completely on a regular basis to keep it fresh. Is this just for the replacement of CO2? So that would mean with your CO2 tank you would never need to dump the air?
Obviously your setup has worked out for you! I have just heard from a few sources that the air needs to be renewed in order for the plants to be content.
Keep up the killer work man