So I can't find anywhere just how close or far lights should be hung from each other. Building a very large grow room. 32' x 24'. Plan on eventually running 18 lights. Have 6 for now. Is 18" on the length and 5 feet on the sides in between each light enough space? Can the lights be overcrowded? Power isn't an issue. Have 200 amp service will be running off its own panel. Have Titan Helios 8 controller for now. Cooling not issue either. Really just want to know about lighting space right now before i get installing. Cut down to 5 a row? 4 a row? Add another row? Teach me Thanks