mate your light is way to far from the plant! your light will do nothing for you invest in a 250 watt cfl only 30 pounds,you will notice a diffrence strait away i cant see your grow room being the right temp and humity! when you flower your plant you decide when you want to harvest and cut it down when 70% of the white pistils are brown is about right,im a new grower myself but done a lot of net search before-hand,check out my grow