We evaluate the effect of three major monochromatic light spectrums on the nutrition quality of okra leaves, by assessing flavonoids, anthocyanin, chlorophyll, carotenoid and water content; and also on stress and senescence. To achieve this, okra was grown under three different LED-based illumination of red (635.03 ± 1.33nm), green (522.27 ± 1.46nm), and blue (455.45 ± 1.80nm) for a daily light integral of  with a 18/6-h light/dark photoperiod; the growing period was separated into three different phases of growth with each phase lasting 20 days, and studied using non-destructive UV/VIS/NIR spectroscopy. Results demonstrated that specific wavelength might regulate production of metabolites compounds to control vegetables’ quality.

LED, fluorescence spectroscopy, reflectance spectroscopy, horticulture lighting, okra, plant metabolism, plant physiology, light spectrum.