Lets also keep in mind that everyone needs to know a little electrical with high tech lighting, fans, co2 valves, relays, in todays gardens (or youre gonna burn your house down)!

I have an extensive electrical background, I see post's all the time telling how they are going to use 1600w to 2000w or even higher lighting systems. Not realizing that at 1600w you are pulling almost 14 amps, at 2000w you are pulling 17.5 amps just for lights. ( formula for amount of amps your lights will draw: Watts divided by Volts) ( ex. 1600w/ 115v = 13.92 amps ) Most homes in the USA are wired with 15 or 20 amp circuts, If you plug in this many watts into one circut you are very close to the limit, so if you plug in something else it will trip the circut breaker or worse cause a fire.
Also when you run amperage close to the breaker limit, specially in older homes the wiring will heat up inside the walls and potentialy start a fire ( notice in the winter time all the house fires caused by space heaters in the news )
So Please eveyone consider the electrcal demand needed when designing a grow space. Most HID systems above 800watts, you are going to need a dedicated circut just for your lights. ( an outlet that runs directly to your CB panel and nowhere else in your home).
It would suck to loose your house to a fire, then be charged with cultivation of a controlled substance, and then try to collect insurance.