Е-Публикации
Технически университет - София

Abstract: The circadian efficiency of indoor lighting is a crucial quantity, giving evaluation of the non-visual stimulation of body cyclic processes, influenced by light. The paper presents an investigation of the influence of mixed light - daylight and electrical light on people estimated by means of α -opic irradiance, α -opic efficacy of luminous radiation and α -opic equivalent daylight (D65) illuminance for different positions in an educational laboratory. The correlated color temperature (CCT) of the artificial lighting is changed as well as the viewing directions of the observers. To estimate the circadian efficiency of lighting in the scenarios considered radiometric measurements of the spectral power distribution of light are taken. The results confirm that daylight conditions are the best for entrainment of the human circadian rhythms, but artificial lighting can also contribute for such an effect.

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