Fig. 6

Effects of supplementary lighting with different spectral compositions on tomato fruit firmness and color. Fruit firmness (A), L (B) value (lightness), a* (C) value (green-red: a* < 0 indicates green, a* > 0 indicates red), b* (D) value (blue-yellow: b* < 0 indicates blue, b* > 0 indicates yellow). Data are presented as mean ± standard error (n = 3 biological replicates). Different letters indicate significant differences at P < 0.05.