Effects of LED light spectra on lettuce growth and nutritional composition

T. Hytönen, P. Pinho, M. Rantanen, S. Kariluoto, A. Lampi, Minnamari Edelmann, K. Kauste, K. Mouhu, V. Piironen, L. Halonen, P. Elomaa

Research output: Contribution to journalArticleScientificpeer-review

11 Citations (Scopus)


Year-round greenhouse production in northern latitudes depends on the use of artificial lighting. Light emitting diodes provide a promising means to save energy during cultivation as well as to modify the light spectrum to regulate the growth and quality of the crop. We compared the effects of light emitting diode lighting with different spectral compositions on the growth, development and nutritional quality of lettuce (Lactuca sativa L. ‘Frillice’). We show that warm-white and warm-white supplemented with blue spectra provide equal growth and product quality compared to conventional high-pressure sodium lighting in the absence and presence of daylight. Our data indicate that for biomass accumulation, the far-red component in the light spectrum is more critical than green light or the red/blue ratio. Furthermore, we demonstrate that a red + blue spectrum increases the concentration of several vitamins in lettuce. However, biomass accumulation using this spectrum was insufficient when daylight was excluded.
Original languageEnglish
Pages (from-to)880–893
Number of pages14
JournalLighting Research and Technology
Issue number6
Early online date28 Mar 2017
Publication statusPublished - 2018
MoE publication typeA1 Journal article-refereed


  • artificial lighting
  • biomass
  • greenhouse production
  • nitrate
  • vitamin
  • LED lighting


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