Growth promotion effect using natural sunlight spectrum LED for plant factory

In recent years, plant factories, which have a high affinity for cutting-edge technologies, such as IoT, AI, and robot technology, have been increasing attention. However, most plant factory companies are in deficit. Therefore, more efficient production method is required. In this paper, we focus on promoting plant growth using LED lighting, which has natural sunlight spectrum. For verifying sunlight LED cherry tomatoes are cultivated hydroponically by using conventional white light LED and natural sunlight spectrum LED. As a result, height growth increases by approximately 5 cm when sunlight LEDs are used. It is also confirmed that the time to harvest are about one week shorter, and the size is about 1 mm larger than average. Specifically, when sunlight LEDs are used, fruits diameter are 11 mm or more larger than that of regular white LEDs. Also, the average weight is about 2 g heavier.