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Home & Garden

How does red light effect the growth of plants?


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For starters: plants appear green because the green light that hits them is the least absorbed (most reflected or transmitted) of the visible wavelengths by chlorophyll pigments. The rest of the visible spectrum is captured as electrons and used to catabolize carbon dioxide and water into sugars.

The major wavelengths of light that are absorbed are at the boundaries of infrared and ultraviolet. They mostly use red and blue light to make sugars from CO2 and H2O, but the blue (higher energy) light has to be de-energized a bit, the red light is more readily usable.