![]() The light spectrum is composed of red, orange, yellow, green, blue, indigo and violet light. Light quality refers to the wavelength or color of light. Hydroponic lettuce and herbs: 6-12 inches.Seedlings: 4-6 inches (move your light up regularly as they grow). ![]() But even with LED and fluorescent lights, maintaining a proper distance helps to ensure healthy plant growth. Keeping sufficient distance between plants and a light source is especially important when using bulbs that produce a lot of heat, like incandescent and high-pressure sodium. A more efficient lightbulb will produce more light with fewer watts of energy. Light bulbs should report both watts and another measure of light intensity such as PPF, lumens or foot candles. ![]()
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