“…Studies have shown that light emitting diodes (LEDs) has the advantages of low heat generation, long service life, good spectral performance, and easy control ( Amoozgar, Mohammadi & Sabzalian, 2017 ; Ferreira et al, 2017 ). In plant factory research, the adoption artificial light sources such as LEDs have proven to have great potential in the regulation on plants growth development ( Dutta Gupta & Agarwal, 2017 ; Efremova et al, 2020 ). In addition, LED can exhibit the advantage of inducing a significant change in plant growth, especially in closed plant factories ( Saito, 2010 ), while significantly increasing the area under cultivation of plants and reducing the shortage of farm land resources ( Kozai, 2013b ).…”