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There's are different types of hydroponic lights. Quite simply, plants need light to grow. The job of a grow light is to provide the correct kind of light to bring natural light to your indoor garden. A micromole is a certain quantity of something, in this case, photons. A whole mole is a huge quantity of photons (roughly 6.02 x 10 PAR is light with wavelengths between 400 nm (nanometres) and 700 nm and it is measured in µmols (micromoles). Plants photosynthesise and grow when they are provided with PAR light (Photosynthetically Active Radiation).
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