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=== Low frequency light ===
Low-frequency light is constituted of red light in the visible spectrum, "far range" and infra-red.
Red light promotes cell elongation in plants, in cannabis, this manifests as stretching of the stem. While not visible to the human eye, far-red light is also photosynthetically active<ref>Dr. Bruce Bugbee (2019) - https://www.youtube.com/watch?v=sS7aAcacfgk&ab_channel=ApogeeInstrumentsInc.</ref>
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