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Title: Tunability of the circadian action of tetrachromatic solid-state light sources

An approach to the optimization of the spectral power distribution of solid-state light sources with the tunable non-image forming photobiological effect on the human circadian rhythm is proposed. For tetrachromatic clusters of model narrow-band (direct-emission) light-emitting diodes (LEDs), the limiting tunability of the circadian action factor (CAF), which is the ratio of the circadian efficacy to luminous efficacy of radiation, was established as a function of constraining color fidelity and luminous efficacy of radiation. For constant correlated color temperatures (CCTs), the CAF of the LED clusters can be tuned above and below that of the corresponding blackbody radiators, whereas for variable CCT, the clusters can have circadian tunability covering that of a temperature-tunable blackbody radiator.
Authors:
 [1] ;  [2]
  1. Institute of Applied Research, Vilnius University, Saulėtekio al. 9-III, LT-10222 Vilnius (Lithuania)
  2. Department of Computer Science, Vilnius University, Didlaukio g. 47, Vilnius LT-08303 (Lithuania)
Publication Date:
OSTI Identifier:
22415169
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 4; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; BLACKBODY RADIATION; LIGHT EMITTING DIODES; LIGHT SOURCES; OPTIMIZATION; POWER DISTRIBUTION