Analysis of circadian light in the retrofit of artificial lighting in a university building
DOI:
https://doi.org/10.46421/entac.v20i1.5848Keywords:
Artificial lighting, Circadian rhythm, Circadian light, Computational simulation, ALFAAbstract
The discovery of intrinsically photosensitive retinal ganglion cells (ipRGC) has confirmed the impact of light on the circadian rhythm and alertness levels in humans. This discovery has led to the development of metrics to assess the non-visual effects of light. The WELL Certification, in its "Circadian Lighting Design" topic, states that a minimum 275 Equivalent Melanopic Lux (EML) should be achieved for at least 4 hours at workstations during the day, with electric lighting being permissible to meet this metric. The objective of this study was to analyze the retrofit design of the artificial lighting system in a higher education classroom in terms of its circadian potential. This design aimed to improve visual comfort, energy efficiency, and compliance with NBR ISO/CIE 8595:2013, without considering the circadian potential of light during its development. Therefore, computational simulation was conducted using the ALFA tool to analyze the melanopic/photopic ratio (M/P) and the EML metric. The M/P ratio yielded neutral results for all simulated conditions. None of the tested luminaires achieved 275 EML in 100% of the viewing directions.
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