I have a 4 1/2' x 4 1/2' x 7' grow space with a 400watt HPS and a 600watt HPS. I was thinking of replacing the 400watt HPS with another 600watt HPS that a friend gave to me. Will this be too much light or is there such a thing as overkill when it comes to the amount of light you have? I use 9-3gal pots of soil and have avg about 1lb of dry smoke each cycle. (about 100 days per cycle) I just use FoxFarms Tiger Bloom for nutes and filtered water. Heat is already an issue but is manageable. Thanx in advance for any feedback.