Abstract
Daylight and lighting seem to be a key tool for people’s well-being, however, there are no specific and agreed recommendations that address both photopic and melanopic aspects in educational environments. The present work analyzed melanopic light in four teaching environments considering photopic indoor lighting, daylight depending on the window orientation, location of the observer in the room, and their line of view. The façade direction, daylight at 11.00 a.m. for six months from October to March, and the characteristics of each classroom, such as reflectance of the surfaces, location of the luminaires and their spectral and spatial power distributions, or calculation points affecting the melanopic light reaching the corneal vertical plane of a hypothetical control observer were studied. For this evaluation, classrooms were experimentally treated and simulated using DialuxEvo software, and the computer-generated values resembled the experimental values. Once the study was performed, an improvement proposal, based on LED lighting, was made to optimize the classroom lighting considering the melanopic requirements, which we ensured that users who passed through these classrooms had an adequate amount light at any time of the day. Our results simplify to the greatest lighting projects and enable designers to carry out optimized evaluations of specific environments from both the photometric and circadian perspectives.
Highlights
Light is a powerful stimulus that regulates and influences different physiological functions, such as the endocrine and behavioral systems, sleep-wake cycles, alertness and disruption of circadian rhythms [1,2]
Indoor lighting projects are dependent on the reflectance of the walls, position of the furniture, the number of luminaires located in the ceiling and their spatial power distribution or the spectral power distribution (SPD) of the lamps [1,3,10,11]
This paper checked whether the analyzed spaces complied with the photopic regulations and melanopic recommendations established by the International Commission on Illumination (CIE) when exclusively artificial light was present and when daylight and artificial light acted together
Summary
Light is a powerful stimulus that regulates and influences different physiological functions, such as the endocrine and behavioral systems, sleep-wake cycles, alertness and disruption of circadian rhythms [1,2]. Our method solves this gap, we describe an innovative way to address both issues knowing photopic illuminances and SPDs of the light reaching a plane This methodology provides important keys to lighting designers, without complex calculations founded in the revised bibliography, to develop architectural projects or scientific studies irrespective of the circadian metric, due to EDI and EML are related as it has previously described. The choice of the located number experimental pointswere for selected each classroom realistic evaluations Their urban design had to accomplish the absence of obstructions was based on the layout of each teaching space and covered the space where users near the windows of the building and approximately orthogonal façade orientations to should be positioned.
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