One of the biggest advantages to indoor gardening is the regulation of plant growth through the use of artificial sunlight. The most commonly used grow lights are metal halide, high pressure sodium, and fluorescents. Each has its advantages that I will briefly cover. Both metal halide and high pressure sodium lights are high intensity discharge, which mean the light they produce has a better ability to penetrate the plant leaves.
Fluorescent light can grow plants indoors, but produces much smaller plants and is generally considered to be far inferior to both metal halide and high pressure sodium lights. Fluorescent lights are most often used with seedlings or clones, as the light produced is gentler on fragile plants.
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