Light spectrum composition of white LED and fluorescent.

Photon flux density of Photosynthetically Active Radiation (PAR: 400–700 nm) and Extended Photosynthetically Active Radiation (ePAR; 400–750 nm) are present in μmol∙m−2∙s−1. Light spectrum of UV (300–400 nm), blue (400–500 nm), green (500–600 nm), red (600–700 nm), and far-red (700–800 nm) are present in percentage of total photon flux (300–800 nm). R/FR is the photon flux density ratio of red to far-red light. PSS represents Phytochrome Photostationary State. The light composition of white LED and fluorescent light was measured by a spectroradiometer.