Have you followed my grow room build Pepe? It's fun to document it as you go and it sounds like your in the same boat I was in not to long ago. This thread was a last minute thing. I had started it when the plants were already growing a little so it's not 100% up to date yet. If you have time or want to check out the build let me know ill link you to it. I also started from scratch. Power was a little issue, my grow is 150 feet from my house and I already had a 60 amp running to the side of my house for a garage I'm building. I just stole it for this. Length of wire affects the final amperage a little with losses over long distances.I don't know how I missed this journal till now, got my priorities straight and am properly subbed now. I am totally impressed with my 450 just with the monochromes on, the veg. growth rate versus MH is very noticeable. I'm starting on a new room in a pole building today. First step is to run a couple 110 circuits 120' underground. How many circuits/amps do you have run to your room?