Adding UVA and Far-Red Light to White LED Affects Growth, Morphology, and Phytochemicals of Indoor-Grown Microgreens

White light emitting diodes (LED) have commonly been used as a sole source for the indoor production of microgreens. However, response microgreens to inclusion ultraviolet A (UVA) and/or far-red (FR) white LED remains unknown. To investigate effects adding UVA and FR LEDs on plant biomass, height, concentrations phytochemicals, four species including basil, cabbage, kale, kohlrabi were grown under six treatments. The first three treatments (control) two (adding whole growth period or last 5 days). Another consisted total photon flux density (TPFD) all was same. percentages photons in TPFD 23% 32%, respectively. Compared LEDs, throughout did not affect height except where 9% reduction observed regardless light. On contrary, addition increased heights by 9–18% kohlrabi, treatment, compared LED. Furthermore, UVA, reduced phenolic contents, antioxidant at least one species. There no interaction between above quality traits In summary, more sensitive UVA; however, may reduce yields phytochemicals some