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What was the initial investment?
Probably around $150 the light was the expensive part. $70 for a light T5 Ho 4' lights 4 Total $15 for a pump $5 for the air stones $20 for PH down and 1 Part nutrient solution $5 for PH litmus paper $15 for the plastic tray from Ikea $10 for the sheet of 2" foam, 1" would have worked better $10 for a 50 pack of grow plugs $3 seeds The light stand I made out of left over Al extrusion from the 3D printer project I never finished. As of yesterday that's only $75 per lettuce not including energy costs (figure heat in the winter doeskin count). elizabeth Buttercrunch Lettuce. Need a verity that doesn't grow very tall and can tolerate warm weather w/o being bitter.