FIGURE 2.

Shoot fresh and dry weights and leaf length on days 11 and 25 of lettuce “Rouxai” grown under six static lighting treatments delivered by warm-white (WW) or mixed blue (B; 400–500 nm), green (G; 500–600 nm), red (R; 600–700 nm), and far-red (FR; 700–800 nm) light-emitting diodes (LEDs). The number for each LED type is its photon flux density in μmol⋅m^–2⋅s^–1. Means followed by different letters within each parameter are significantly different based on Tukey’s honestly significant difference test (α = 0.05). Error bars show standard errors.