loulac: You are correct...there is no great reason for the fan in the photo above. It was originally put there to dissipate heat from the fluorescent lights. Now it is used to disturb/strengthen stems of tomato seedlings. As the plant canopy grows taller, the lights are dimmed to recommended strength. Also use a series of boxes and boards below the trays to raise them. It is easier to raise and lower the plants than to raise and lower the lights. "Organic Homegrown Tomatoes $1000.00" ...that is cost price, not sale price.
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