![]() 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. Watts are a measure of the amount of energy needed to produce light, rather than a measure of the actual intensity of the light.Lumens measure how bright the light is to the human eye, and do not measure some of the important wavelengths that plants need to grow. ![]()
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