The Intensity of LED Grow Lights Affects Plant Growth and Photosynthetic Characteristics

1. The intensity of LED grow lights affects plant growth and morphological characteristics

The germination rate of seeds under light conditions is higher than that under dark conditions, indicating that seed germination is dependent on light. 100μmol/m²/s light intensity promotes the growth of seedling hypocotyls and roots, and the taproot also grows best under 100μmol/m²/s, while the light intensity of 47 and 20μmol/m²/s is conducive to the growth of sprout stems. As the intensity of the LED grow lights decreases, the solanum lycopersicum doesn't grow well.

2. The intensity of LED grow lights affects plant pigment synthesis and photosynthetic characteristics

The content of chlorophyll and carotenoid is the lowest at 15μmol/m²/s, and the content is highest at 60μmol/m²/s. The carotenoid content of orchid seedlings under medium light intensity was significantly higher than that under low light intensity and high light intensity. Low light intensity increases the content of chloroplasts, chloroplast pigments and electron carriers in plant leaves.

Carotenoids can use excess LED grow lights to protect leaves from photoinhibition. Under high light intensity, the leaves of Lactuca sativaL have oxidative damage. In order to avoid the damage caused by this stress or reduce the degree of damage, a series of protective measures are automatically activated.

High light intensity promoted the increase of total phenolics, total glutathione and ascorbic acid (Vc) content and CAT activity of broad bean seedlings, while low light intensity promoted the increase of anthocyanin content and SOD activity of broad bean seedlings.

Studies have shown that strong light promotes the accumulation of monoterpenoids, and its content decreases under low light. The intensity of the LED grow lights of 310μmol/m²/s is beneficial to the increase of the total flavonoid content in the leaves, stems and roots of ginger seedlings.