Kush , It depends what size area are you planning to have to work with? you want to keep the elect. the same and get 4 plants with a decent yield. Well you have to pay to play my friend, your gonna have to expect a little jump in the elect to get 4 plants going. Id suggest a 400w if you can afford it. I am running a 400w hps in my flwr area and i have 150w mh and 105w cfl in the veg area and just a few smaller cfls in the clone area. my bill has jumped significintly over the past few grows as i've added more lights along the way. But i have gotten great results from a perpetual grow setup. if you get yourself a good 400w setup and put 4 plants in a 3x3 or 4x4 area you will get yourself some good results. don't forget to get your air and temps in line and you'll be good to go.