Semiconductor Lamp for Investigation and Control of Photophysiological Processes in Plants

  • Z. Bliznikas Vilniaus universitetas
  • K. Breivė Vilniaus universitetas
  • G. Tamulaitis Vilniaus universitetas
  • G. Kurilčik Vilniaus universitetas
  • A. Novičkovas Vilniaus universitetas
  • A. Žukauskas
  • P. Duchovskis Lietuvos sodininkystės ir daržininkystės institutas
  • R. Ulinskaitė Lietuvos sodininkystės ir daržininkystės institutas
  • A. Brazaitytė Lietuvos sodininkystės ir daržininkystės institutas
  • J. Šikšnianienė Lietuvos sodininkystės ir daržininkystės institutas


A semiconductor light-emitting diode based lamp with variable spectrum for investigation and control of photophysiologicprocesses in plants under artificial-climate conditions is described. High-power emitters with the peak wavelengths of the spectral powerdistribution functions at 453 nm (the flux density from 0 to 9 μmol/m2s), 640 nm (0 to 150 μmol/m2s), 660 nm (0 to 10 μmol/m2s) and731 nm (0 to 3 μmol/m2s) were used for the spectral ranges, which are responsible for control of the photosynthetic andphotomorphogenetic processes in plants.Results on the influence of variable-spectrum illumination of vegetables (lettuce Grand Rapids, radish Saxa) are presented. Analysisof photosynthetic and photomorphogenetic processes shows that these processes can be controlled by selection of a particular spectralcomposition of the incident light and circadian regime of illumination. Ill. 11, bibl. 4 (in Lithuanian, summaries in Lithuanian, Russianand English).