Indoor Lighting Design Research Articles

Research on Integrated Art Design of Building Exterior Finishing with Photovoltaic Application Technology

This study is based on the cold regions of China, namely severe and cold regions. By fully utilizing photovoltaic technology, local green energy can be reasonably utilized, and feasible reference can be provided for architectural design in cold regions of China. Based on the “dual carbon” goal, the application of photovoltaic technology in building skins is discussed. Through the research of this project, it is possible to clarify ways to reduce carbon emissions and promote local green and sustainable development. Examples were provided to illustrate the main manifestations of photovoltaic building integration. Through the specific application and analysis of photovoltaic housing projects, photovoltaic curtain walls, photovoltaic components, and photovoltaic materials in the skin system, it is explained that photovoltaic materials can play an important role in participating in the shaping of building form and space. The key to the integration of photovoltaic building technology is to find the best balance between energy, comfort, indoor lighting environment, economy, and design aesthetics.

Light4Health eLearning Course: health research for interior lighting design. Re-thinking design approaches based on science

This paper presents the results of ‘Light4Health’ (L4H), a three-year EU Erasmus+ Strategic Partnership grant project (2019-2021), which investigated, systematized and taught health-related research on the impact of natural and artificial light on human health and well-being relevant to indoor lighting design. The objective was to re-think evidence-based lighting design approaches for residential, working/educational, and healthcare spaces, in order to develop a novel cross-disciplinary eLearning platform, that intersects lighting design and current peer-reviewed health research through a select combination of the most relevant research, methods, and tools. The content was developed through teaching workshops with international researchers, teachers, and students. Participating students were introduced to the application of relevant research and new metrics, in order to produce creative lighting design proposals. Students were able to inform lighting design approaches that support health and well-being without compromising creativity via the tools and methods developed through the health sciences. With this project, participants and consortium members have narrowed the gap that exists between research and the practice/application of lighting, by translating research from complex scientific jargon into various tools for designers to use. The knowledge gained, was consolidated into an open-access online curriculum for international lighting design students, educators and professionals via the free eLearning Moodle platform (https://course.light4health.net/).

Indoor lighting design for healthier workplaces: natural and electric light assessment for suitable circadian stimulus.

Light, especially daylight, plays a critical role in human health as the main timer for circadian rhythms. Indoor environments usually lack the correct exposure to daylight and are highly dependent on electric lighting, disrupting the circadian rhythm and compromising the health of occupants. The methodology proposed assesses the combination of natural and electric lighting on circadian rhythms for operational environments. The case study chosen examines a 24/7 laboratory area representing an open-plan shift-work area. Several electric lighting scenarios under different sky conditions have been assessed, considering a variable window size and resulting in a spectrum which establishes the indoor circadian regulation performance according to the amount of light perceived. A set of configurations is presented to determine optimal electric lighting configuration based on natural light conditions in order to ensure a suitable circadian stimulus and the electric lighting flux threshold for different scenarios, benefiting occupants' health while also ensuring energy conservation.

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

It is a common opinion that LEDs emit a very high amount of energy in the blue range, which could be potentially harmful to our visual tissues. This study focuses on the LED lamps used for interior lighting and was carried out base don the parameters of 15 LED lights collected by inspectors from the Consumer Council of Castilla la Mancha, Spain. The samples were acquired at random from various commercial establishments. The luminaires acquired in collaboration with the public administration can be placed in any workplace or home. The following is a study of the nominal risk of blue light. The results show that these LED luminaires comply with relevant regulations, and none of them pose a risk to the retina because they all belong to the risk-free group.

A New Trend for Indoor Lighting Design Based on A Hybrid Methodology

A New Trend for Indoor Lighting Design Based on A Hybrid Methodology

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

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.

Indoor lighting optimization: a comparative study between grid search optimization and particle swarm optimization

Design of an indoor lighting system involves, in general, a number of design parameters, viz. maintained average illuminance, uniformity of illuminance, unified glare rating, lighting power density. These design parameters are mutually conflicting and at the same time constrained because recommended value of each of the design parameter is to be satisfied simultaneously by adjusting design variables which are also bounded by upper and lower limits. An indoor lighting design problem involves a small number of design variables, such as spacing between adjacent luminaires, mounting height of luminaires, and the objective function is non-differentiable and thus suitable to apply both the grid search optimization and particle swarm optimization methods. This study compares the performance of these two methods to find out optimized design solutions for a set of indoor lighting design strategies, usually come across by lighting designers. An objective function is formulated by assigning weights to the design parameters, where a specific design strategy can be selected by adjusting the weights. This study reveals that the performance of PSO is significantly better to meet the qualitative aspect of lighting ambiance; however, the improvement is not significant than the grid search method when a design strategy puts stress upon the quantitative aspect of lighting.

Optimization of luminaire layout to achieve a visually comfortable and energy efficient indoor general lighting scheme by Particle Swarm Optimization

ABSTRACT The design of an indoor lighting system for a sustainable building should comply with the recommended maximum limit of lighting power density. The occupants’ visual comfort and visual performance are to be ensured by complying with some mutually conflicting lighting design parameters, such as maintained average illuminance, overall uniformity, and maximum unified glare rating, to the recommended limits. Judicious balance among these multiple conflicting design parameters is a practical design problem. This article aims to address these aspects of indoor lighting design by applying a particle swarm optimization (PSO) algorithm in a developed lighting computation program. The objective function is formulated with maximum or minimum limits for the design parameters recommended by international standards. The effectiveness of the developed program is evaluated by designing an indoor lighting system with commercially available luminaires for an office space that ensures optimized visual comfort, energy efficiency, and initial cost. Optimized results are validated by DiaLux simulation and a maximum deviation of 2.27% is found. Thus, the results show good agreement with DiaLux simulation and significant improvement in the uniformity of illuminance (0.90) compared to the recommended minimum value (0.70) and in discomfort glare (16) compared to the recommended allowable maximum value (19). The developed program establishes the usefulness of the PSO algorithm to optimize the luminaire layout for an indoor general lighting scheme.

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

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.

LIGHTING DESIGN FOR THE AGING EYES

Lighting allows users to accomplish their tasks, feel safe and understand the surrounding environment. Therefore, it is an inseparable component of buildings. Building codes, energy standards and regulations determine the required illuminances to provide visual comfort. However, the existing requirements are constituted considering healthy eyes only. Different visual comfort requirements for people with visual disabilities, in particular for elderly people, are not clear. The world’s older population continues to grow remarkably. In fact, the illuminance requirements show great difference for elderly people. For instance, an average 60 years old eye requires three times more illuminance than an average 20 years old eye. Therefore, a lighting design that complies with the regulations may not satisfy elderly users’ needs.Elderly spend most of their time indoors thus indoor spaces should fulfill their needs. Indoor lighting design and visual comfort are vital to prevent accidents and falls. Though such technical information is critical, it has not sufficiently covered in literature from elderly users’ perspective. For that reason within this study, technical lighting design recommendations for residential areas from previous research have been offered to obtain visual comfort for elderly users. Different visual requirements of each space type are emphasized to promote accessible design for elderly. The research aims to contribute to literature and guide future research on elderly indoor comfort. Article DOI: https://dx.doi.org/10.20319/mijst.2017.33.185194 This work is licensed under the Creative Commons Attribution-Non-commercial 4.0 International License. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc/4.0/ or send a letter to Creative Commons, PO Box 1866, Mountain View, CA 94042, USA.

Integrating building information modeling and virtual reality development engines for building indoor lighting design

BackgroundLighting simulation tools are extending the functionality of Building Information Modeling (BIM) authoring software applications to support the lighting design analysis of buildings. Although such tools enable quantitative and qualitative analysis and visualization of indoor lighting, they do not provide an interactive environment between users and the design context. Moreover, their visualization environments do not allow users to experience visual phenomena such as glare. In addition, lighting energy consumption generated from traditional tools is often separated from the 3D virtual context of the building. Therefore, an incorrect interpretation by designers regarding the relationship between their desirable lighting design and energy feedback may occur.MethodsThis research proposes a method and develops a BIM-based lighting design feedback (BLDF) prototype system for realistic visualization of lighting condition and the calculation of energy consumption.ResultsThe results of a case study revealed that BLDF supports design stakeholders to better perceive and optimize lighting conditions in order to achieve a higher degree of satisfaction in terms of lighting design and energy savings for future occupants.ConclusionsThe developed system utilizes an interactive and immersive virtual reality (VR) environment to simulate daylighting and the illumination of artificial lights in buildings and visualizes realistic VR scenes using head mounted displays (HMD). BLDF allows users to interact with design objects, to change them, and to compare multiple design scenarios, and provides real-time lighting quality and energy consumption feedback.

An Overview of Energy Efficient Lighting System Design for Indoor Applications of an Office Building

Indoor Lighting design of different types of buildings is a very challenging and technology oriented work. Building lighting designing has specific rules and regulations and can be varied depending upon the designers choice. As per National Building Code of India, buildings can be classified according to the use or the character of occupancy in one of the nine groups. These are Group A_(Residential), Group B_(Educational), Group C_(Institutional),Group D_(Assembly ),Group E_(Business), Group F_(Mercantile), Group G_(Industrial) ,Group H_(Storage) and Group J_(Hazardous) types of buildings. With the reduction of energy consumption, there should not be any sacrifice in quality and quantity of light required as per the lighting codes. The shortage of Electrical energy is increasing gradually. As it is the energy source of lighting, the lighting designers should be more concerned about energy efficient lighting system design. LED consumes less power than the conventional luminaires & maintains almost the same lighting level. So, lighting designers are using LED luminaires into their designs now a days. Also, renewable energy sources driven lighting systems should be used. It will be environmental friendly also. A proper lighting design requires consideration of the amount of functional light level provided, the energy consumed and the aesthetic effect supplied by the lighting system. The electrical lighting systems should also consider the impacts of, and ideally be integrated with, daylighting systems. Building lighting design focuses on three fundamental aspects of the illumination of buildings or spaces. The first is the aesthetic appeal of a building. Secondly, the ergonomic aspect: the measure of how much of a function the lighting can achieve. Thirdly is the energy efficiency issue to ensure that light is not wasted by over-illumination, light pollution, by illuminating vacant spaces unnecessarily or by providing more light than needed for the aesthetics or the task.

A step towards the optimization of the indoor luminous environment by genetic algorithms

Buildings are heavily responsible for energy consumption and CO2 emissions. Increasing their energy efficiency is in the direction of the EU strategies; and this is consistent with EU Energy Performance of Buildings Directive (EPBD 2010/31/EU), 2010. In this view the design and management of daylight and artificial light can play a fundamental role. In this paper, a method to optimize indoor lighting design from energy efficiency, economic and environmental viewpoints is presented. The optimization was developed through the Genetic Algorithms technique and the optimal layout in terms of number, location and mounting heights of luminaires in a generic office room was evaluated. Solutions with different types of light sources, nominal luminous flux and photometric distribution curves were compared and the cost effectiveness of these alternatives was also considered. The systems resulting from the optimization show increased uniformity of illuminance, a reduction of the number of luminaires and a decrease of the maximum UGR values, proving the effectiveness of the technique in the lighting design field. Results show that current methods for lighting design can still be improved to achieve optimal configurations in terms of energy efficiency and cost effectiveness.

The LED Technology: A Review of Effects on Indoor Lighting and Fixture Design

The LED Technology: A Review of Effects on Indoor Lighting and Fixture Design

Research on Key Technology of CAD for Crystal Lamp with Planar Distribution

Crystal lamp has been preferred in indoor lighting design because of its gorgeous effect of light. Crystal lamp has many same or similar elements in the structure, so using CAD technology can help designers to quickly design and model crystal lamp. In this paper, the planar distribution of crystal lamp has been divided into two kinds of situations such as the concentric form crystal distribution and the rectangular form crystal distribution. Aiming at each situation, mathematical analysis has been done and the pseudo-code been given respectively. Then a parameterized modeling plug-in for crystal lamp aided design based Rhinoceros platform has been developed by using VB language. By selecting the parameters and variables, the plug-in can automatically create 3D model of crystal lamp, thus realize the parameterized modeling and improve the efficiency of design.

Optimal LED-based Illumination Control via Distributed Convex Optimization

Abstract Achieving illumination and energy consumption targets is essential in indoor lighting design. The provision of localized illumination to occupants and the utilization of natural light and light-emitting diode (LED) luminaires can help meet both objectives. This paper presents several distributed optimal illumination control schemes that provide localized illuminance to occupants. The lighting system consists of multiple LED-based luminaires, each governed by an individual local controller. The illuminance requirements and energy costs for the lighting system are expressed as a linear programming problem that is solved in a distributed manner, using only local communication amongst the controllers. State-of-the-art accelerated first-order methods are applied to parallelize the optimization among multiple controllers. Practical aspects such as convergence rate, computational complexity and communication requirements are investigated via simulations.

Senior Living Environments: Evidence-Based Lighting Design Strategies

To review from an architectural lighting perspective the effects of indoor lighting on the health and well-being of people in senior living environments. The role of circadian rhythms in people with chronic disorders continues to be a focus of laboratory research and clinical trials. Beneficial, evidence-based indoor lighting design strategies are being considered for senior living environments, particularly for residents who have limited access to natural bright light. Articles published 2002-2012 reporting the results of prospective, randomized, controlled clinical trials (RCTs) were accessed using the U.S. National Library of Medicine PubMed site using the following search terms: "light, sleep, circadian, randomized, controlled, nursing home" and "light, sleep, circadian, randomized, controlled, elderly." The search resulted in 48 citations, of which 18 meet our pre-search criteria. Data from these RCTs indicate options such as programmable, 24-hour lighting algorithms that may involve light intensity, lighting duration, spectra (wavelength) and lighting timing sequences Valid and actionable data are available about circadian rhythms, sleep, and human health and well-being that can inform the design of lighting for long-term care. Evidence-based architectural design of a 24-hour light/dark environment for residents may mitigate symptoms of circadian disruption; evidence-based management of darkness is as important as evidence-based management of light. Further research is needed into the long-term circadian health needs of night staff members in order to understand the effects of shift work while, at the same time providing the highest level of care. Design process, elderly, evidence-based design, lighting, literature review.

Relationship between Irradiation Direction of the Light Source and Direction of Visual Axis

Retinal illuminance was the effective illuminance vector arrived at the retina;This article engaged in a study of the irradiation direction of the light source and the direction of the visual axis under two cases: the light source to regular reflection surface and irregular reflection surface, and tried to inquiry in what proportion of lighting flux can actually arrive at places needed and the retina based on the research of angle relationships, it can give guidance for indoor and outdoor lighting design.

Interactive Lighting Design with Hierarchical Light Representation

AbstractLighting design plays a crucial role in indoor lighting design, computer cinematograph and many other applications. Computer‐assisted lighting design aims to find a lighting configuration that best approximates the illumination effect specified by designers. In this paper, we present an automatic approach for lighting design, in which discrete and continuous optimization of the lighting configuration, including the number, intensity, and position of lights, are achieved. Our lighting design algorithm consists of two major steps. The first step estimates an initial lighting configuration by light sampling and clustering. The initial light clusters are then recursively merged to form a light hierarchy. The second step optimizes the lighting configuration by alternatively selecting a light cut on the light hierarchy to determine the number of representative lights and optimizing the lighting parameters using the simplex method. To speed up the optimization computation, only illumination at scene vertices that are important to rendering are sampled and taken into account in the optimization. Using the proposed approach, we develop a lighting design system that can compute appropriate lighting configurations to generate the illumination effects iteratively painted and modified by a designer interactively.

Simulating the illuminance and the efficiency of the LED and fluorescent lights used in indoor lighting design

In this study we simulate the illuminance and efficiency of four different types of reflector LED and fluorescent light sources for interior illumination. According to our calculation results of the examination of simulations and real situations, we find that the LEDs do perform better than fluorescent lights. We also consider the problems of glare with LED lights by utilizing a diffuser to protect the eyes. We are assured of the potential advantages of LED lighting in the future.