Hi all. I'm new to the board. Here's my situation. I have a 400watt HPS mounted to a hood attached to a 6ft PVC frame that I built so I could raise and lower my light as needed via the chains that attach the hood to the frame. I'm running a deep water hydroponic system that features four 20 gallon tubs that have spots for 4 plants per tub. So as it stands right now I can have 16 plants going at once. My plants are growing incerdibly fast and it seems to me that 16 plants under one 400 watt HPS might be too much. They're already crowding each other and im just under a month into my operation. So can I have 16 plants under one 400 watt HPS? How close can you crowd the plants together? Will I get better yield from fewer plants that I grow larger? Or should I crowd up smaller plants and get a fast harvest of many plants? This is my first time growing so thanks for the info.