Figure 3.

Effect of LED spectra on Chlorophyll a (A), Chlorophyll b (B), Carotenoid (C), and Chlorophyll a/b ratio (D) of hemp seedlings at 30, 60, and 90 DAT. Here and subsequent figures: L1, MW 240 (Red 35% + Blue 25% + Green 40%); L2, FS 240-UV (Red 40% + UVA and Blue 26% + Green 29% + Far red 5%); L3, MB 240 (Red 85% + Blue 15%); L4, PF 240 (Red 70% + Blue 30%). All treatments used a photosynthetic photon flux density of 300 µmol m⁻² s⁻¹. Column height indicates the mean, vertical bars indicate the standard error of the mean (n = 4), and different letters indicate significant differences at p < 0.05.