“…Consequently, the usage of UV wavelengths in CEA is still in its initial stages (Wargent, 2016; Neugart and Schreiner, 2018). Although UV LED lighting is a new technology, research has been conducted on the effects of UV-A LED, as a part of different lighting systems or as a sole source of light, on the growth and metabolism of plants (Li and Kubota, 2009; Samuolienė et al, 2013; Khoshimkhujaev et al, 2014; Brazaitytė et al, 2015; Vaštakaitė et al, 2015; Lee et al, 2014; Brazaitytė et al, 2016; Goto et al, 2016; Rechner et al, 2017; Jensen et al, 2018). Some of these investigations showed that UV-A LED leads to higher total phenolic content, anthocyanin content, ascorbic acid concentration, and antiradical properties in leafy vegetables and herbs (Li and Kubota, 2009; Samuolienė et al, 2013; Brazaitytė et al, 2015; Vaštakaitė et al, 2015; Goto et al, 2016).…”