Design & Development of a Solar Powered, CCT changing R-B-W LED Based Artificial Window

2018 ◽  
pp. 191-198
Author(s):  
Basudeb Das ◽  
Asit Kumar Sur ◽  
Saswati Mazumdar
Keyword(s):  
Light Output ◽  
Well Being ◽  
Lighting Design ◽  
White Led ◽  
Design Development ◽  
Visual Effects ◽  
Night Time ◽  
Solar Powered ◽  
Indoor Lighting ◽  
Dynamic Lighting

The concept of Artificial Window is being applied in indoor lighting design since couple of years and is easily available in market, but the main drawback of these artificial windows is their constant CCT (Correlated Colour Temperature) light output. The developed artificial window is a CCT changing system, which follows the preset pattern of daylight CCT throughout the day. It will very effective for those, who stay in a window­less room or a closed room. It is known that light not only has the visual effects but also has photo­biological effects. A dynamic light is very helpful in well being, positive mood, increased concentration, alertness consequently increased productivity. The developed system is solar powered at daytime; this window is powered by the SPV module directly without using battery. A small battery is being charged simultaneously which powers the system at night time. The window is made using two types of coloured LEDs: Red and Blue and Warm White LED. The new concept of dynamic lighting provides a very wide CCT range from 2300 K to 10800 K.

scholarly journals Towards a Sustainable Indoor Lighting Design: Effects of Artificial Light on the Emotional State of Adolescents in the Classroom

2020 ◽  
Vol 12 (10) ◽  
pp. 4263 ◽  
Author(s):  
David Baeza Moyano ◽  
Mónica San Juan Fernández ◽  
Roberto Alonso González Lezcano
Keyword(s):  
Blue Light ◽  
Emotional State ◽  
Spectral Composition ◽  
Lighting Design ◽  
Artificial Light ◽  
Visual Effects ◽  
Light Emitting ◽  
Interior Lighting ◽  
Indoor Lighting ◽  
Research Show

In recent years, articles have been published on the non-visual effects of light, specifically the light emitted by the new luminaires with light emitting diodes (LEDs) and by the screens of televisions, computer equipment, and mobile phones. Professionals from the world of optometry have raised the possibility that the blue part of the visible light from sources that emit artificial light could have pernicious effects on the retina. The aim of this work is to analyze the articles published on this subject, and to use existing information to elucidate the spectral composition and irradiance of new LED luminaires for use in the home and in public spaces such as educational centers, as well as considering the consequences of the light emitted by laptops for teenagers. The results of this research show that the amount of blue light emitted by electronic equipment is lower than that emitted by modern luminaires and thousands of times less than solar irradiance. On the other hand, the latest research warns that these small amounts of light received at night can have pernicious non-visual effects on adolescents. The creation of new LED luminaires for interior lighting, including in educational centers, where the intensity of blue light can be increased without any specific legislation for its control, makes regulatory developments imperative due to the possible repercussions on adolescents with unknown and unpredictable consequences.

scholarly journals Recommendations for Healthy Daytime, Evening, and Night-Time Indoor Light Exposure

2020 ◽  
Author(s):  
Timothy Brown ◽  
George Brainard ◽  
Christian Cajochen ◽  
Charles Czeisler ◽  
John Hanifin ◽  
...  
Keyword(s):  
Light Exposure ◽  
Present Report ◽  
Well Being ◽  
Lighting Design ◽  
Measured Quantity ◽  
Physical And Mental Health ◽  
Night Time ◽  
And Performance ◽  
Design And Practice ◽  
Health And Well Being

Ocular light exposure has important influences on human health and well-being through modulation of circadian rhythms and sleep, as well as neuroendocrine and cognitive functions. Current patterns of light exposure do not optimally engage these actions for many individuals, but advances in our understanding of the underpinning mechanisms and emerging lighting technologies now present opportunities to adjust lighting to promote optimal physical and mental health and performance. A newly developed, SI-compliant standard provides a way of quantifying the influence of light on the intrinsically photosensitive, melanopsin-expressing, retinal neurons that mediate these effects. The present report provides recommendations for lighting, based on an expert-scientific consensus and expressed according to this new measurement standard. These recommendations are supported by a comprehensive analysis of the sensitivity of human ‘non-visual’ responses to ocular light, are centred on an easily measured quantity (melanopic equivalent daylight (D65) illuminance), and provide a straightforward framework to inform lighting design and practice.

Luminous Environment and the Perceived Environment

2019 ◽  
pp. 15-21
Author(s):  
Banu Manav
Keyword(s):  
Experimental Studies ◽  
Light Output ◽  
Lighting Design ◽  
Lighting System ◽  
Main Concept ◽  
Healthy Environment ◽  
Perceived Environment ◽  
Efficiency Cost ◽  
Lighting Systems ◽  
User Friendly

In lighting design, the main concept is to achieve a healthy environment, which addresses energy efficiency, cost, maintenance, and quality. User-friendly lighting systems shall be adopted to architecture and interior architecture. User control over the lighting system is important, by dimming or increasing light output, by changing the colour of the light sets the inner atmosphere and affects user mood. Standards and codes on lighting shall also be evaluated by means of these topics. The paper aims to analyse how the luminous environment is affective on the perceived environment. Hence, a series of experimental studies and recent research will be evaluated in regard to understanding and designing luminous environment.

Lighting Design Taking into Account the Non-Visual Effects of Light

2020 ◽  
pp. 95-114
Author(s):  
Agnieszka Wolska ◽  
Dariusz Sawicki ◽  
Małgorzata Tafil-Klawe
Keyword(s):  
Lighting Design ◽  
Visual Effects

scholarly journals Student Homelessness: Sheltering Our Future: An Adaptable Approach to Underutilised City Spaces

2021 ◽  
Author(s):  
◽  
Caryl Ramos
Keyword(s):  
Urban Space ◽  
Modular Design ◽  
Well Being ◽  
Test Site ◽  
Urban Setting ◽  
Homeless Population ◽  
Future Application ◽  
Design Development ◽  
Urban Context ◽  
The City

<p>The increasing housing demands from population growth creates a persistent housing shortage and unaffordability in our cities. Students are one demographic that is dramatically affected as they move closer to their education provider for study. The student influx at the start of the semester creates a large demand in the already inadequate housing market. Students with a limited budget have reduced accommodation options and this consequently drives many into a state of homelessness. A study from University of Otago measures that over a quarter of New Zealand’s homeless population are students (Amore, 2016). This considerable number of students are living in cars, tents, couch-surfing and sleeping rough for weeks during their studies. The desperate situation impinges on the student’s health and well-being and thus their academic performance.  In this context, the scope of this research focuses on the requirements of homeless tertiary students in the urban setting. Their vulnerability, insecurity and distress are explored to provide direction to solutions that will alleviate the existing problems of their insufficient living environments. As proximity to the education providers and amenities are key factors, this thesis examines underutilised and leftover spaces within the city as opportunities for inhabitation, and to create efficient use of urban space. Currently, there are successful examples of activating overlooked laneways into vibrant spaces. However, these transformations rely on the activities in the lane and the interventions are largely landscaping and installations. By investigating the successful regeneration of previously undesirable and neglected spaces through architectural re-imagination, this thesis identify laneways to be a potential site to the urgent need for shelters.  The architectural experiments and design development are informed by the combination of site challenges and programme to form an overall design-led research. The thesis tests how temporary modular design has a significant role in the design of economic and adaptable solutions for the increasing issue of homelessness. This establishes that through a critical design, we may shelter those in desperate need within the urban context. The architecture provides a safe environment that is empathetic to its users and the larger urban scale while also creating a statement and awareness to homelessness. The thesis concludes with the design framework for a single test site and assesses its suitability for future application to other leftover spaces in the city.</p>

Development of a psychological pathway model linking lighting quality to well-being in indoor café environments

2018 ◽  
Vol 27 (3) ◽  
pp. 390-401 ◽  
Author(s):  
Dong Hyun Kim
Keyword(s):  
Structural Equation ◽  
Well Being ◽  
Pathway Model ◽  
Aesthetic Judgement ◽  
Pathway Models ◽  
Negative Feelings ◽  
Indoor Lighting ◽  
The Impact ◽  
Psychological Pathway

The aim of the study was to investigate whether indoor lighting quality would have any systematic impact on psychological well-being of people working in café environments. Earlier studies have mostly focused on the impact of lighting in typical workspace environments through laboratory settings. The present study was conducted under two different real café environments; one with daylight, another without daylight, with a total of 66 customers’ participation. Two psychological pathway models that linked customers’ self-reported lighting quality, pleasantness, aesthetic judgement of space appearance, environmental satisfaction and feelings of eye discomfort were developed. Application of structural equation modelling produced strong fits to these two models, one with daylight, another without daylight, in which quality of lighting was linked with environmental satisfaction and feelings of eye discomfort in both cafés. The results suggest that under a non-daylit café environment, providing good quality lighting can both directly and indirectly promote environmental satisfaction and decrease negative feelings of eye discomfort, while under a daylit café environment, perceived lighting quality was only indirectly linked.

ANALYSES ON OCCUPANT PATTERNS AND ENERGY CONSUMPTION IN RESIDENTIAL BUILDINGS INCLUDING THE COVID-19 PANDEMIC

2021 ◽  
Author(s):  
B. Manav ◽  
E. Kaymaz
Keyword(s):  
Energy Demand ◽  
Residential Buildings ◽  
Well Being ◽  
Lighting Design ◽  
Occupancy Patterns ◽  
Lighting Energy ◽  
And Performance ◽  
Mental Well Being

In the last years, as a result of environmental concerns, changes in lifestyle during the COVID-19 crisis, the role of healthy buildings in addition to the main lighting design principles are highlighted. Therefore, today’s lighting design issues include social well-being, mental well-being, and physical well-being more than we discussed in the last century. Hence, we are familiar with occupant-centric and performance-based metrics for residential and non-domestic buildings. The study analyses the extended occupancy patterns, daylight availability, and annual lighting energy demand through a case study in Bursa, Turkey including the COVID-19 pandemic scenario.

scholarly journals Monitoring the Interannual Spatiotemporal Changes in the Land Surface Thermal Environment in Both Urban and Rural Regions from 2003 to 2013 in China Based on Remote Sensing

2019 ◽  
Vol 2019 ◽  
pp. 1-17 ◽  
Author(s):  
Yuanzheng Li ◽  
Lan Wang ◽  
Liping Zhang ◽  
Qing Wang
Keyword(s):  
Land Surface ◽  
Thermal Environment ◽  
Well Being ◽  
Urban Heat Islands ◽  
Central China ◽  
Human Reproduction ◽  
Night Time ◽  
Rural And Urban ◽  
Significance Levels ◽  
Moderate Resolution Imaging Spectroradiometer

The thermal environment is closely related to human well-being. Diurnal and seasonal variations in surface urban heat islands (SUHIs) have been extensively studied. Nevertheless, interannual changes in SUHIs as well as in land surface temperatures (LSTs) in cities and their corresponding villages remain poorly understood, particularly using data from several continuous years to analyse change rates and corresponding significance levels. Using Aqua/Terra moderate resolution imaging spectroradiometer (MODIS) data for 2003–2013, we explored not only the interannual changes in annual and seasonal mean LSTs in rural and urban regions which were identified based on modified criteria, but also the SUHI intensities (SUHIIs) for these cities. The results showed that most of LSTs and SUHIIs did not change significantly (p≥0.05). Their changes exhibited clear spatiotemporal agglomeration and variation laws. The rural region LST change rates, which exhibited significant changes, were generally highest in the summer, with most of values of 0.1–0.5°C (yr−1) during the daytime across China, except for the Xinjiang autonomous regions, and 0.1–0.2°C (yr−1) during the night-time. The rates were lowest in the winter, with most of values of −0.4 to −0.1°C (yr−1). The rates of daytime SUHIIs with significant changes were generally highest in the summer, with most of values of 0.1–0.3°C (yr−1), and lowest in the winter, even with most of values of −0.4 to −0.1°C (yr−1) in northern central China. During the night-time, most of rates were 0.0–0.1°C (yr−1). In China, most of the changes in the surface thermal environment were harmful to humans at both large national and local urban scales. The changes could lower thermal comfort levels, harm human health, affect human reproduction rates and lives, and increase the energy consumed for refrigeration or heating, thereby increase emissions of greenhouse gases.

Nominal risk analysis of the blue light from LED luminaires in indoor lighting design

Optik ◽  
2020 ◽  
Vol 223 ◽  
pp. 165599
Author(s):  
David Baeza Moyano ◽  
Silvia Baeza Moyano ◽  
Miguel Gómez López ◽  
Alejandro Salcedo Aznal ◽  
Roberto Alonso González Lezcano
Keyword(s):  
Risk Analysis ◽  
Blue Light ◽  
Lighting Design ◽  
Indoor Lighting
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