Shoot fresh mass (grams) of lettuce ‘Rouxai’ grown without (control) or with supplemental end-of-production lighting of ultraviolet A (UVA; 315-399 nm), blue (B; 400-499 nm), green (G; 500-599 nm), and/or red (R; 600-699 nm) light for the last 6 d of production. The subscript value following each waveband represents its photon flux density in µmol·m−2·s−1. Data are the mean of two replications with 10 samples in each replication. There were no significant differences according to Tukey’s honestly significant difference test (α = 0.05). Pictures are representative plants from each treatment.
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