Fig. 1From: Growth, leaf anatomy, and photosynthesis of cotton (Gossypium hirsutum L.) seedlings in response to four light-emitting diodes and high pressure sodium lampColor spectrum of light-emitting diodes (LEDs) and high pressure sodium (HPS) lamp. PPFD (μmol·m−2·s−1): photosynthetic photon flux density. Black line represents the visible spectra of solar radiation in the 380–780 nm rangeBack to article page