The impact of room surface reflectance on corneal illuminance and rule-of-thumb equations for circadian lighting design

Cai, Wenjing; Yue, Jiguang; Dai, Qi; Lian-jie, Hao; Lin, Yi; Shi, Wen; Huang, Yingying; Mao, Wei

doi:10.1016/j.buildenv.2018.05.056

Cited by 60 publications

(40 citation statements)

References 30 publications

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“…This paper proposed an analysis with scale model. This technique is called 'reference office' as a lighting assessment methodology (13,(32)(33)(34)(35).…”

Section: Methodsmentioning

confidence: 99%

Investigation of the relationship between depth of overhang and amount of daylight indicators in office buildings of Kerman city

Kermani

Nasrollahi

Mahdavinejad

2018

Environ Health Eng Manag

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Background: The use of daylight in offices has become an effective strategy to improve the quality of indoor space and energy efficiency. There is enough potential to have daylight autonomy in Kerman as a city with more than 300 sunny days a year. Therefore, this study aimed to investigate the relationship between facades configuration and the amount of daylight in office buildings of Kerman. Methods: This study was carried out based on the simulation in DesignBuilder software (DBS). In this study, 36 typical rooms, with the same physical characteristics (4 m×6 m×4 m), with window-to-wall ratio (WWR) between 10-90% with four overhang depths (0, 0.5, 1 and 1.5 m) were modeled. Results: Based on daylight utilization, the results indicate that an optimal WWR for a room with 1 m overhang depth ranged from 50% to 70%. Also, the room with 0.5 m overhang depth and without overhang, had suitable daylight while WWR was at least 50%, but the room with 1.5 m depth would not encounter glare problem even when WWR was 90%. Conclusion: The results confirm that overhang depth and WWR have significant effect on daylight parameters such as daylight factor (DF), work plane illuminance (WPI), and WPI ratio. Hence, these insights can be useful for designers to design buildings with lower energy use and higher daylight quality, when enough light is provided in office rooms.

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“…This paper proposed an analysis with scale model. This technique is called 'reference office' as a lighting assessment methodology (13,(32)(33)(34)(35).…”

Section: Methodsmentioning

confidence: 99%

Investigation of the relationship between depth of overhang and amount of daylight indicators in office buildings of Kerman city

Kermani

Nasrollahi

Mahdavinejad

2018

Environ Health Eng Manag

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“…The examination of the studies so far completed on light pipes shows that none of them has investigated the relationship between installations using light pipes and non-visual effects like circadian entrainment in their users [18,19]. The currently available tools to predict corneal illuminance will allow designers to decide whether one room receiving natural light can have positive effects on the health of its users.…”

Section: Introductionmentioning

confidence: 99%

Flat Glass or Crystal Dome Aperture? A Year-Long Comparative Analysis of the Performance of Light Pipes in Real Residential Settings and Climatic Conditions

Sibley

Peña-García

2020

Sustainability

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This paper presents the first comparative study of its type of the performance of light pipes with different types of apertures: a flat glass versus a bohemian crystal dome. Measurements were taken at 20-minute intervals over a period of one year in the bathrooms of two newly built identical houses of the same orientation located in Manchester, UK. The comparative analysis of the data collected for both light pipes types reveals that the crystal domed aperture consistently outperforms the flat glass one. Furthermore, the difference in the recorded horizontal illuminance is most marked during the winter months and at the end of the one-year experiment, indicating that the crystal dome has better performance for low incident winter light and higher resistance for the long term effect of weathering and pollution. This study provides strong evidence based on long term real measurements. Such evidence informs architects’ decisions when weighing up the aesthetic considerations of a flat glass aperture versus the higher illumination levels afforded by a crystal dome aperture with higher resistance to weathering and pollution.

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“…En la retina, además de los conos y bastones, responsables de estas funciones visuales, están las células ipRGC presentes en toda la retina del ojo, más sensibles a la radiación de longitudes de onda de la zona de los azules, con el pico de máxima sensibilidad en 480nm, responsables de la entrada por el ojo de la luz necesaria para, a través de una ruta no formadora de imagen, regular el reloj biológico. Si bien no tenemos suficiente conocimiento de los efectos fotobiológicos y no visuales de la luz, se debe analizar la cantidad de luz que puede llegar a la córnea [25] y, lo que es más importante, a la retina. La diferente distribución retiniana de las ipRGC y su población, dependiente de la edad, indican que la exposición nasal es más efectiva que la exposición temporal, y la exposición inferior a la luz parece inducir una respuesta mayor que la exposición superior [26].…”

Section: Discussionunclassified

Proposal to calculate the circadian component in lighting projects

Sánchez‐Cano¹,

Pérez²,

Aporta³

2019

Opt. Pura Apl.

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There are international norms which define methods for characterizing indoor luminaries in terms of photopic considerations and visual requirements, but lighting impacts in humans in others ways than those. Light in buildings is part of the environment, the discovery of the ipRGC cells in the human retina, and its associated action spectra, lead to the introduction of initial concepts such as circadian action functions and circadian action factors. An innovative methodology is proposed and evaluated to simulate potential melanopic contribution of the lit environment to the occupants of an indoor space. By performing measurements and efficiency simulations based on real LED luminaries, we are determining which parameters could be calculated in melanopic terms. Our measurements lead us to follow a method to differentiate and complement photopic and melanopic contributions of sources. These melanopic illuminance metrics require irradiance-wavelength-dependent measurements; recalculating polar curves, modifying data files, and spectral reflectance characterization to evaluate the melanopic contribution of the lit environment. We validate a simulation model through a comparison between the experimentally measured lighting values and those provided as output by commercial lighting design software DIALux.

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The impact of room surface reflectance on corneal illuminance and rule-of-thumb equations for circadian lighting design

Cited by 60 publications

References 30 publications

Investigation of the relationship between depth of overhang and amount of daylight indicators in office buildings of Kerman city

Investigation of the relationship between depth of overhang and amount of daylight indicators in office buildings of Kerman city

Flat Glass or Crystal Dome Aperture? A Year-Long Comparative Analysis of the Performance of Light Pipes in Real Residential Settings and Climatic Conditions

Proposal to calculate the circadian component in lighting projects

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