Avaliação da iluminação natural no ambiente construído considerando o ciclo circadiano humano

Abstract

Light is a fundamental element for human health and well-being because, in addition to impacting visual comfort, it directly influences biological rhythms through hormonal regulation and circadian synchronization. This dissertation investigates the effectiveness of natural lighting in meeting the needs of the non-visual (circadian) system in a classroom of the Postgraduate Program in Built Environment at the Federal University of Juiz de Fora (PROAC – UFJF), based on the ABNT NBR 15215-4:2024 standard. The main objective was to assess whether the natural lighting in the room is sufficient to meet the recommended melanopic parameters, using the melanopic equivalent lux (MEL) as a metric. The methodology adopted a literature review and a case study with computer simulation using DIALux software, a solar chart, and the Lucas Spreadsheet. The results indicated that, during both the winter and summer solstices, the natural lighting in the room under analysis is insufficient to meet the demands of the visual and non-visual systems during the period of use. In both cases, the need for supplementation with adequate artificial lighting was observed, especially with LED luminaires with low correlated color temperature (TCC ≤ 3500 K), to ensure visual comfort and efficient circadian stimulation.