Spectral distribution of the white background light (peaks at 451, 605, and 659 nm) and end-of-production (EOP) supplemental ultraviolet-B (UVB; peak at 309 nm), ultraviolet-A (UVA; peak at 368 nm), violet (V; peak at 404 nm), blue (B; peak at 444nm) and red (R; peak at 659 nm) light.

The white background light was applied at 200 µmol m -2 s -1 for 16 h/day throughout the 28-d production period (W 200 ; control). The EOP supplemental UVB radiation was applied at 3 µmol m -2 s -1 for 16 hours per day during the last seven days of the production period, while the EOP UVA, V, B and R lights were applied at a higher intensity of 60 µmol m -2 s -1 . The subscript number after each waveband indicates its photon flux density in μmol m -2 s -1 .