Fig. 5
From: Optimizing LED lighting spectra for enhanced growth in controlled-environment vertical farms
Spectral composition of the five lighting treatments used in the study. The bars show the photon flux density (µmol·m⁻2·s⁻1) contributed by each LED wavelength: blue (B, 450 nm), green (G, 530 nm), deep red (DR, 660 nm), and far red (FR, 730 nm). Treatment W included only white light, while other treatments received various combinations of supplemental DR and FR light. The final treatment (WDR122FR60) had the highest total photon flux density, with both DR and FR doubled.
