I started with a 1000w HPS, 2 circulation fans, heater (when needed) in the main room, 3 48"shoplight fixtures and 1 fan in veg. room. My monthly bill was $240. I added a 250w MH and the bill was $250. I recently added a 4 bulb 48" fixture, 2 8" inline fans, 6oow HPS digital, humidifier and a...