How does UV rays kill germs but grow plants?
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When we use ultraviolet to sterilise things, we use UV-C, which is the highest frequency/energy of ultraviolet. This is not the same as what we use in ultraviolet lamps for plants, which use UV-A and/or UV-B.
The lower energy of the light used for plants means they don’t do as much damage, as it is not ionising to most materials.
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