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Indoors, light determines growth. Horticultural LED bars provide a spectrum suited to growth or flowering, and hang above the crops at an adjustable height. Aquarium LED lights illuminate the tank and its plants, and a timer automates the lighting cycles.
Generally allow 14 to 16 hours of light per day for leafy greens and vegetative growth, and 12 hours for flowering. The article Getting started with indoor hydroponics helps you size the lighting.















