Dude, if you want to know the approximate cost of running all that. Get your electric bill and check the kilowatt hours used and divide it into your electric bill cost. That will give you the cost of each kilowatt hour.

Ok, now that you have that number (mine was .14 cents) write it down so you can remember it. Now take the bulb wattage and multiply it by the hours of operation you will be using it. So you a 250 for veg multiplied by how ever many hours you run it DIVIDED by 1000. That number will give you how many kilowatt hours it will be (Example: a 400 watt lamp running for 18 hours will use 7.2 kilowatt-hours).

Now take the cost of each kilowatt hour and multiply it with the kilowatt hours used and that will be the cost of running that light for those many hours a day.

So for a run down, I have a 430W HPS running at 18hrs a day. So 430 x 18hrs/1000 gave me 7.7 kilowatt-hours....Now take that 7.7 and I multplied that with my cost of each kilowatt-hour (which, for me was .14 cent). That then gave me 1.08. So it cost me $1.08 a day to run that 430HPS on 18hrs a day. So 1.08 x's 30 days in a month and that gives me a little over $32 extra for that set up.

Do you get it? If not I'll be glad to do the numbers for ya if you can figure out the cost of each kilowatt hour on your electric bill!