Table 1 Photosynthetic photon flux density (PPFD) of far red (FR, 701–780 nm), red (R, 600–700 nm), green (G, 500–599 nm), blue (B, 400–499 nm), and ultraviolet-A (UV-A, 380–399 nm) for LEDs (light-emitting diodes) and HPS (high pressure sodium) lamp, and ratio of FR (PFR), R (PR), G (PG), B (PB) and UV-A (PUV-A) to total photosynthetically active radiation (PAR) of each light source

From: Growth, leaf anatomy, and photosynthesis of cotton (Gossypium hirsutum L.) seedlings in response to four light-emitting diodes and high pressure sodium lamp