Photon flux densities of lighting treatments.

Actual individual waveband, total (300–799 nm), and yield photon flux densities [8] delivered in each lighting treatment. Treatments consisted of different combinations of blue (B; 400–499 nm), green (G; 500–599 nm), red (R; 600–699 nm), and far-red (FR; 700–799 nm) light to achieve a target total photon flux density (TPFD) of 176 μmol∙m−2∙s−1. Yield photon flux density (YPFD) ranged from 99.2 to 160.3 μmol∙m−2∙s−1. Subscripted values of the lighting treatments denote waveband photon flux densities in μmol∙m−2∙s−1.