The sun is an essential element for the survival and growth of most plants. It is one of the main actors of photosynthesis.

Sunlight is a tremendous and inexhaustible source of energy. All this energy is captured in the chlorophyllian cells of the plants (which gives them their green color). Indeed the leaves are real solar panels for the latter, the larger they are, the more they capture energy and therefore they can practice photosynthesis.

Sunlight differs from a simple lamp by its light spectrum. Plants are used to specifically absorb light corresponding to the spectrum of the sun. It is possible to approach it but hardly to equal it. Lighting a plant artificially requires a lot of energy, so it is very difficult to completely replace the sun.

Plants, just like us, have adapted to the cycle of the sun. It would not be beneficial to be permanently exposed to a light source. It is at night that they grow the most because their growth hormone, auxin, is partially destroyed by light.