Hello all, I have a tent I plan on using for 2 Auto plants, the size of the tent is 70x70x160cm. The light I have is the Mars II 400. As I understand this light is actually only 250watts. I'm wondering if this light will be enough for the 2 plants, and if adding an additional light around the same wattage would significantly increase yields? I also keep seeing how one light for each plant might be better. Any help is much appreciated!