Sup guys. We just got our 600w HPS/MH with switchable ballast We were curious how much it would cost per month so I found this calculator: http://www.citytrf.net/costs_calculator.htm All you might need to find is what your rate is on your energy bill. Mine in the philly area was around 0.13. Running 24/7 it will cost $56 a month. Little bit more than I thought...but not a bad investment by any means.
29USD a month here, with 550w running! Twice/trippel as much in a week, getting 2x300w more and 2x200w.
got a 467w 2700k CFL setup, using right now at 12/12 costs me .40 a day 36.66 a quarter and 146 a year, id say thats still alot cheaper then buying the shit lol
i have a sensor connected to my electric meter and thats linked to a display box so it tells me how much im using and i can estimate my bill before it comes through the post lol cost me £80 for the equipment and its the best invesment ever. i only use £1 a day and i run 400w in one grow room for 12 hours a day and 150w in the second for 24 hours a day. i also run my xbox all the times, tv, pc and my oven etc is all electric =/ that site tells me i use ALOT more then i am but its a good estimate lol nice find