'Light' is one of the most important factors for the growth of plant. For instance, when the wavelength and/or strength of light changed, the plant changes shape and/or the nutritional content.

Some pigments of the plant absorb specific light (wavelength) and these reactions are caused. LED, which allows you to select the emitting colors, makes the experiments possible that the features of growth are extracted.

【Photosynthesis】
lighting energy is used in an important photoreaction, the synthesis of carbon dioxide and water into organic compounds. The pigments called chlorophyll play a role in this reaction by absorbing light.

【Photomorphogenesis】
This is a photoreaction that induces qualitative changes in a plant, such as seed germination, floral differentiation, flowering, development of cotyledons, chlorophyll synthesis, stem elongation, and so on. The pigments called phytochrome and cryptochrome are involved in this process.