Santa Cruz, California
With an input of 38 watts per square foot the flowers will not be as large, dense or potent as they would be under a more intense light. Your idea of eliminating two of the six trays seems sound.
Place the four trays in a square configuration. The trays cover between 36 and 49 feet depending on how closely together they are placed. At 36 square feet (11 square meters) the garden has a light input of about 66 watts per square foot. If there is a foot distance between each tray, the garden measures 49 square feet (15 square meters) the light input will be 49 watts per square foot. Obviously, keeping the 4 trays close together so the plants receive the brightest light is the most efficient use of the light.
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