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Light treatment spectra, relative portion of red, λmax = 660 nm (R660), and far-red, λmax = 739 nm (FR), in their combination: Treatment 1—0% R660 + 100% FR; Treatment 2—30% R660 + 70% FR; Treatment 3—70% R660 + 30% FR; Treatment 4—100% R660 + 0% FR.
