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Cai, W.; Yue, J.; Dai, Q.; Hao, L.; Lin, Y.; Shi, W.; Huang, Y.; Wei, M. |
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Title |
The impact of room surface reflectance on corneal illuminance and rule-of-thumb equations for circadian lighting design |
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Journal Article |
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Year |
2018 |
Publication |
Building and Environment |
Abbreviated Journal |
Building and Environment |
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Volume |
141 |
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Pages |
288-297 |
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Keywords |
Lighting |
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Abstract |
Recently, corneal illuminance attracts much attention because it is closely related to important functions of indoor lighting. Especially, applying circadian light in the built environment places a challenging requirement on indirect corneal illuminance. In this work, rule-of-thumb equations are proposed to guide circadian lighting design: (i) for artificial lighting, Ecor,avg (i) = (Φ/C1) · ρ/(1−ρ′), where Ecor,avg (i) is the average indirect corneal illuminance at standing or sitting positions, Φ is the initial flux from luminaires, C1 is a constant comparable to the total room surface area, ρ is the reflectance of the surface where the first reflection occurs, and ρ′ is the area-weighted average of surface reflectance; and (ii) for daylighting, Ecor,avg (i) = C2 · WWR · ρ/(1−ρ′), where C2 is a constant, and WWR represents the window-to-wall ratio.
The equations above are validated by comparing against numerical simulation data obtained with the Radiance software. For artificial lighting simulation, various combinations of room surface reflectance, initial light distribution, and WWR are investigated; and for daylighting simulation, different combinations of surface reflectance, WWR, and geographic location are analyzed. The good fits to simulation data indicate that the proposed simple equations can provide reasonably accurate results for quick feedback at the field. It is also demonstrated that room surface reflectance has a dominant impact on indirect corneal illuminance. The approach of improving surface reflectance is more favorable than increasing luminaire flux or expanding window area, and therefore should be the recommended approach to achieve quality and efficient circadian lighting. |
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0360-1323 |
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GFZ @ kyba @ |
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1929 |
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Author |
Calvo-Sanz, J.A.; Tapia-Ayuga, C.E. |
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Title |
Blue light emission spectra of popular mobile devices: The extent of user protection against melatonin suppression by built-in screen technology and light filtering software systems |
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Journal Article |
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Year |
2020 |
Publication |
Chronobiology International |
Abbreviated Journal |
Chronobiol Int |
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1-7 |
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Keywords |
Measurements; Blue light; blue light emission; light control software; mobile devices; screen technology |
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Abstract |
Blue light, with wavelengths shorter than 440-450 nm, is the most energetic radiation of the visible spectrum for the human eye, and its possible multiple effects on the human nervous and other systems have become a line of research by many investigators. The use of mobile devices whose screens emit various amounts of blue light is common nowadays. This study evaluated the efficiency of the blue light screen and control software technologies of eight different mobile devices. Emitted screen spectra of the different mobile devices according to different conditions of blue light emission software control were obtained using a spectrograph, and the derived spectra were compared with the melatonin suppression action spectrum. The amount of blue light emission and predicted melatonin suppression varied according to the unique software control and screen technology of each device. AMOLED screen technology, compared with other screen technologies, achieved better control of blue light emission. The effect of blue light filters depends on the screen technology; however, the melatonin suppression index of mobile devices is not reduced sufficiently by the use of blue light-attenuating software. |
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Departamento De Fisica De La Atmosfera Y Astrofisica, Universidad Complutense De Madrid , Madrid, Spain |
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English |
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0742-0528 |
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PMID:32649241 |
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IDA @ john @ |
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3048 |
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Camejo, D.; Frutos, A.; Mestre, T.C.; del Carmen Piñero, M.; Rivero, R.M.; Martínez, V. |
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Title |
Artificial light impacts the physical and nutritional quality of lettuce plants |
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Journal Article |
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Year |
2020 |
Publication |
Horticulture, Environment, and Biotechnology |
Abbreviated Journal |
Hortic. Environ. Biotechnol. |
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61 |
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1 |
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69-82 |
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Plants; Antioxidants; Bioactive compounds; Enzymes; Growth; lettuce; Lactuca sativa |
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Leafy vegetables, including lettuce (Lactuca sativa L.), are considered to be healthy due to their high content of fiber, folate, carotenoids, phenolic and antioxidant compounds, minerals, and vitamins A, C, and K. Recently, LEDs are being used extensively as a supplementary light source in indoor agriculture due to the economical and physiological advantages that this artificial illumination offers compared to traditional fluorescence illumination. In this work, two commercially important lettuce varieties, Batavia Lettony (green leaves) and Batavia Diablotin (red leaves), were used to study the impact of LEDs (white and red–blue lights) and fluorescent illumination on their quality and health properties. Changes in the photosynthetic photon flux density from 250 to 400 µmol m−2 s−1 of fluorescent light increased growth parameters (leaf number, fresh and dry weight, and percentage of dry matter) of B. Lettony plants. We observed a positive impact of red–blue LED illumination on growth parameters analyzed in B. Diablotin plants compared to plants grown under fluorescent light at 250 µmol m−2 s−1. Leaf texture significantly increased in B. Lettony plants grown under 400 µmol m−2 s−1 fluorescent and LED illumination compared to that of plants grown under 250 µmol m−2 s−1 fluorescent light. This variable was only increased under red–blue LED illumination in B. Diablotin plants. Accumulation of bioactive compounds, such as anthocyanins and vitamin C, was higher in B. Diablotin plants grown under 250 µmol m−2 s−1 fluorescent light. Nutrient content in the foliar part was not modified under the light conditions used, except the Ca2+ content of B. Lettony plants grown under PPFD 400 µmol m−2 s−1 fluorescent light. Catalase (CAT) and peroxidase (POX) activities were differentially modified by light conditions in B. Lettony plants. However, POX activity was only modified in response to light conditions in B. Diablotin plants. Thus, this study demonstrates that LEDs could be used as an alternative to produce food under sustainable conditions. In this sense, although several horticultural studies have been conducted to establish the effectiveness of LEDs in lettuce growth, additional investigations are necessary to determine the optimal conditions for the use of LEDs to promote lettuce production and the accumulation of beneficial components, such as vitamins, minerals, fiber, and antioxidant compounds. |
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Department of Plant Nutrition, CEBAS-CSIC, Campus Universitario de Espinardo, P.O. Box 164, 30100, Espinardo, Murcia, Spain; |
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Springer |
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English |
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English |
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2211-3452 |
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IDA @ john @ |
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3393 |
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Author |
Cammaerts, M. C., & Cammaerts, R. |
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Title |
Effect of nocturnal lighting on an ant’s ethological and physiological traits |
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Journal Article |
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2019 |
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MOJ Ecology & Environmental Sciences |
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4 |
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5 |
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211-218 |
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Animals |
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Artificial nocturnal lighting affects the nature, an impact best studied on vertebrates that are directly depending on the presence or absence of light. Here, we examined on an ant species taken as a model the effects of artificial nocturnal lighting on eleven physiological and ethological traits. Ant workers maintained under nocturnal lighting showed a decrease or a change in their level of activity, food consumption, locomotion, orientation ability, audacity, tactile perception, social relationship, learning and memory. This was largely observed during the night but the effects persisted, at a lower extend, during the day |
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IDA @ intern @ |
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2735 |
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Author |
Campisi, D.; Gitto, S.; Morea, D. |
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Economic feasibility of energy efficiency improvements in street lighting systems in Rome |
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Journal Article |
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2017 |
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International Journal of Energy Economics and Policy |
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7 |
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1 |
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190-198 |
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Economics; Energy; Society; LED lighting; LED; real options |
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This study evaluates an investment project concerning the redevelopment of the public lighting of the Municipality of Rome. In particular, we consider the replacing of the traditional lamps of the system with LED lamps. We consider the factors that affect this kind of project: the cost of energy, the manteinance cost, the investment cost and the Weighted Average Cost of Capital (WACC). Our results underline the reduction of energy consumption and of the maintenance costs, lower emissions of CO2 into the atmosphere, the reduction of light pollution, the positive effects on road safety and the indipendence by incentives. |
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Department of Industrial Engineering, University of Rome Tor Vergata, Italy |
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Elsevier |
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IDA @ intern @ |
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2629 |
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