cost me $1.85 a month to run my grow, with a 150w cfl on 18/6, and an intake fan. it works wonderous, ive grown 3 plants, i dont have much room so i can only grow 1 at a time. every plant i have grown has been healthy, and had a good yeild regardless of using cfls for flowering. i grew some strawberry cough my second time around and i still cant get over how high the shit got me for my cheap ass grow setup, although its cheap its fucking nice. its semi-professional and i spent under 50 dollars. plus some household items i had around too, so probably about 100 dollars total but some items i used had more sentimental value than being worth money..