Melatonin Suppression under LED Lighting Focused on Spectral Power Distribution Differences

  • Hong, Seong-Kwan ;
  • Kim, Kyoung-Sil ;
  • Kim, In-Tae ;
  • Choi, An-Seop
  • Received : 2015.06.11
  • Accepted : 2015.07.02
  • Published : 2015.08.31


Changes in melatonin concentration levels by differences in CCT of white LED light focused on Spectral Power Distribution (SPD) differences compared to the same CCT of conventional fluorescent light were analyzed. For this, melatonin concentration levels in saliva samples were taken over four different experiments at seven-day intervals. In 71.4% of participants, it was confirmed that melatonin concentration is suppressed by exposure to light, and a slight difference was observed by different CCTs. In addition, Experiment II with a high CCT was relatively high in terms of the melatonin suppression rate compared to Experiment III. A key finding was the possibility that different SPDs under a particular CCT of white LED light compared to the same CCT of conventional fluorescent light could have the same effect on the melatonin suppression.


Circadian Rhythm;Correlated Color Temperature (CCT);Melatonin Suppression;Spectral Power Distribution (SPD);White LED Luminaire


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Supported by : National Research Foundation of Korea (NRF)