scholarly journals Melanopic Limits of Metamer Spectral Optimisation in Multi-Channel Smart Lighting Systems

Energies ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 527
Author(s):  
Babak Zandi ◽  
Adrian Eissfeldt ◽  
Alexander Herzog ◽  
Tran Quoc Khanh
Keyword(s):  
Visual Pathway ◽  
Theoretical Concept ◽  
Lighting System ◽  
Case Scenario ◽  
Legal Requirements ◽  
Smart Lighting ◽  
Chromaticity Coordinates ◽  
Lighting Systems ◽  
Indoor Lighting ◽  
Planckian Locus

Modern indoor lighting faces the challenge of finding an appropriate balance between energy consumption, legal requirements, visual performance, and the circadian effectiveness of a spectrum. Multi-channel LED luminaires have the option of keeping image-forming metrics steady while varying the melanopic radiance through metamer spectra for non-visual purposes. Here, we propose the theoretical concept of an automated smart lighting system that is designed to satisfy the user’s visual preference through neural networks while triggering the non-visual pathway via metamers. To quantify the melanopic limits of metamers at a steady chromaticity point, we have used 561 chromaticity coordinates along the Planckian locus (2700 K to 7443 K, ±Duv 0 to 0.048) as optimisation targets and generated the spectra by using a 6-channel, 8-channel, and 11-channel LED combination at three different luminance levels. We have found that in a best-case scenario, the melanopic radiance can be varied up to 65% while keeping the chromaticity coordinates constant (Δu′v′≤7.05×10−5) by using metamer spectra. The highest melanopic metamer contrast can be reached near the Planckian locus between 3292 and 4717 K within a Duv range of −0.009 to 0.006. Additionally, we publish over 1.2 million optimised spectra generated by multichannel LED luminaires as an open-source dataset along with this work.

A field study of fluorescent and LED classroom lighting

2016 ◽  
Vol 50 (4) ◽  
pp. 631-650 ◽  
Author(s):  
N Gentile ◽  
T Goven ◽  
T Laike ◽  
K Sjoberg
Keyword(s):  
Secondary School ◽  
Field Study ◽  
Energy Savings ◽  
Electricity Consumption ◽  
Visual Comfort ◽  
Lighting System ◽  
Upper Secondary ◽  
Lighting Systems ◽  
Indoor Lighting ◽  
Academic Year

Indoor lighting is facing a massive retrofit to LED lighting. Research is needed to assess whether LED-based lighting can promote energy efficiency, boost visual comfort and support biological functions. This field study considered the lighting of four identical classrooms in an upper secondary school in Helsingborg, Sweden. Two classrooms were fitted with state-of-the-art ceiling pendants containing T5 fluorescent tubes and that had a direct/indirect light distribution (the control rooms). The other two classrooms were fitted with an experimental LED indirect lighting system (the experimental rooms). In the classrooms, 72 students aged 17–18 years performed their usual educational activities over a whole academic year. The light environment, electricity consumption, and students’ mood, light perception and saliva cortisol concentration were monitored. The two lighting systems produced only marginal differences. Overall, the experimental rooms were slightly preferred but achieved only small energy savings due to high parasitic losses.

scholarly journals Development and Implementation of a Self-Optimizable Smart Lighting System Based on Learning Context in Classroom

2020 ◽  
Vol 17 (4) ◽  
pp. 1217
Author(s):  
Baoshi Sun ◽  
Qiaoli Zhang ◽  
Shi Cao
Keyword(s):  
Student Performance ◽  
Light Emitting Diode ◽  
Environmental Parameters ◽  
Environmental Data ◽  
Color Temperature ◽  
Lighting System ◽  
Learning Context ◽  
Led Lighting ◽  
Smart Lighting ◽  
Lighting Systems

Illumination is one of the most important environmental factors in the classroom. Researchers have discovered that lighting settings have significant impact on students’ performance. Although light-emitting diode (LED) lighting systems can precisely control brightness level and correlated color temperature (CCT), existing designs of LED lighting control systems for classrooms are focused on energy-saving but lack context-based illumination control ability. In this study, a smart lighting system with continuous evolution capability was developed. It can adjust brightness, CCT, and illuminance distribution dynamically according to specific learning context. This system allows not only manual control, but also automatic switching of scenes by integrating with school schedules. Based on existing knowledge about lighting preference, 10 lighting modes confined in the comfortable zone of Kruithof curve were proposed for various classroom scenarios. Moreover, a classroom environmental data-processing framework for collecting and analyzing learning context, illumination settings, environmental data, and students’ performance data was introduced. This framework can help researchers explore the correlation between student performance and environmental parameters.

A REAL-TIME INTEGRATIVE LIGHTING SYSTEM FRAMEWORK BASED ON MACHINE LEARNING

2021 ◽  
Author(s):  
D. Durmus
Keyword(s):  
Decision Making ◽  
Evolutionary Algorithms ◽  
Real Time ◽  
Initial Conditions ◽  
Large Data ◽  
Psychological Needs ◽  
Lighting System ◽  
Smart Lighting ◽  
Lighting Systems ◽  
Human Factors Research

Smart lighting systems are based on sensors and tunable lighting systems are increasingly more prevalent, but collecting, analysing, and using the large data generated by these sensors are challenging. Inspired by research on evolutionary algorithms, it can be hypothesized that an adaptive lighting system can operate in real-time by adjusting its output through a decision-making algorithm based on data mining techniques. Such an adaptive lighting system requires two-order input from users; initial and continual. Initial conditions provide training to the system through human factors research investigating the interaction between humans and their environment. Continual conditions are provided by data collected through sensors in real-time, and they continuously feed into the decision-making algorithm to adjust the output to meet occupants’ biological and psychological needs. Research indicates that artificial intelligence techniques, such as evolutionary algorithms, can emerge as good candidates for this framework.

Smart Control for Wireless Indoor Lighting System Based on ZigBee Technology

2014 ◽  
Vol 898 ◽  
pp. 792-796
Author(s):  
Dan Liu ◽  
Hong Yu
Keyword(s):  
Light Intensity ◽  
Real Time ◽  
Pulse Width Modulation ◽  
Low Cost ◽  
Lighting System ◽  
Smart Lighting ◽  
Zigbee Technology ◽  
Smart Control ◽  
Time Parameters ◽  
Indoor Lighting

ZigBee is a kind of low rate, low cost and low power technology to be used in cheap, fixed, portable and mobile devices in wireless sensor network. The wireless smart indoor lighting system based on ZigBee technology uses the chip CC2530 as the core. It can collect the light intensity signals of LEDs in real time; perform pulse width modulation (PWM) and wireless communications. The system can also display these parameters on a personal computer such as temperature, light intensity and so on. Even the real-time parameters may be transmitted to the mobile phone to monitor. As a result of the indoor tests that have been conducted, the smart lighting system is more humanized, safe and energy-efficient.

scholarly journals Smart Lighting Application for Energy Saving and User Well-Being in the Residential Environment

2021 ◽  
Vol 13 (11) ◽  
pp. 6198
Author(s):  
Moe Soheilian ◽  
Géza Fischl ◽  
Myriam Aries
Keyword(s):  
Literature Review ◽  
Energy Saving ◽  
Well Being ◽  
Residential Environment ◽  
Controlled Environment ◽  
Lighting System ◽  
Smart Lighting ◽  
Residential Environments ◽  
Lighting Systems ◽  
Lighting Application

The idea of smart lighting has emerged over the years in commercial and industrial environments, with a focus on energy saving. With the advancement in technology, smart lighting can now offer opportunities in addition to energy saving to users in home environments for the provision of a comfortable atmosphere and the maintenance of user well-being. Currently, research in the smart lighting field is predominantly dedicated to energy saving in non-residential environments; meanwhile, the residential environments have not been explored. Therefore, a literature review was conducted to provide an overview of smart lighting systems’ effect on energy and well-being in the residential environment. Current research is mostly limited to designing and developing a smart lighting system in a controlled environment, with a limited evaluation of well-being and comfort. The review shows that residential smart lighting application possibilities and opportunities are not widely and thoroughly explored.

scholarly journals ICT Driven Smart Lighting Solution “iLIGHT” for Smart Cities: A Conceptual Framework

2021 ◽  
pp. 78-95
Author(s):  
Dipak S. Gade
Keyword(s):  
Data Analysis ◽  
Power Consumption ◽  
Smart City ◽  
Smart Cities ◽  
Smart Devices ◽  
Lighting System ◽  
Research Papers ◽  
Smart Lighting ◽  
New Findings ◽  
Lighting Systems

Purpose: Smart Cities offers enhanced quality and performance of urban services using various ICT and Digital Technologies. It is a fact that more and more people are migrating to Smart Cities for better career opportunities and to have an enjoyable and comfortable life. With the ever-increasing population, Smart Cities always need to do better capacity management to best utilize and optimize the usage of available resources. One of such challenges faced by Smart Cities is the generation of electricity to meet the increasing demand for lighting. The objective is to have an efficient as well as an economical lighting system that can provide sufficient lighting to its infrastructure facilities, offices, Smart Buildings, Smart Parks, and Public properties. In this paper, I have proposed ICT based Smart Lighting Solution "iLIGHT", which is capable of meeting the lighting need of Smart Cities in a more efficient and economical manner. The advantages and limitations of "iLIGHT" are also discussed in detail. The analytics-based test results revealed that "iLIGHT" can reduce power consumption by almost 30%. I have also provided the summary of reviewed existing literature on the lighting solutions used by Smart Cities and the advantages and limitations of these lighting solutions. I also analysed different usage scenarios for indoor and outdoor Smart Lighting Systems in Smart Cities and their typical power consumption. Finally, I have covered information with respect to my future plans on the "iLIGHT" Lighting Solution. Design/Methodology/Approach: A systematic literature review is carried out for relevant white papers, data presented over relevant websites, available research papers and conference papers on Smart Lighting System for Smart Cities. I also interacted with SMEs and Industry professionals working on this research area. The collected research material is then properly studied and analysed to identify new facts and requirements related to Smart Lighting System. Based on the new findings and data analysis results, a new Smart Lighting Solution "iLIGHT" is proposed for Smart City Smart Lighting System. Findings/Result: Smart Lighting System for Smart City is a complex system and used not only for providing efficient lighting across the Smart City but also used to interconnect various smart devices across Smart City and to provide seamless data interactions across the connected products. The Proposed "ILIGHT" Solution for Smart Lighting System in Smart City, is safe, reliable, and less expensive in design and deployment. It can offer good energy efficient Lighting System for Smart City and if used with proper configuration settings then it can be extremely fast and economical to operate and maintain. Originality/Value: The information presented in this paper with respect to proposed "iLIGHT" Solution is original and genuine and is an outcome of interactions with SMEs, Smart City stakeholders and study and analysis of various research papers in order to understand the advantages and limitations of various Smart Lighting Systems used in Smart Cities across the globe. The paper has provided new findings with respect to Smart Lighting Systems for Smart Cities, and they are completely based on own data analysis and proposed new iLIGHT Solution. Paper Type: Technology oriented Research

scholarly journals IoT Enabled Smart Lighting System for Smart Cities

2021 ◽  
Vol 2089 (1) ◽  
pp. 012037
Author(s):  
V Dankan Gowda ◽  
Arudra Annepu ◽  
M Ramesha ◽  
K Prashantha Kumar ◽  
Pallavi Singh
Keyword(s):  
Information And Communication Technologies ◽  
Smart City ◽  
Energy Savings ◽  
Smart Cities ◽  
Energy Resources ◽  
Lighting System ◽  
Smart Lighting ◽  
Information And Communication ◽  
Lighting Systems ◽  
Indoor And Outdoor

Abstract The pace of urbanisation has risen tremendously during the last few decades. To provide a higher quality of life, urban dwellers will require a greater variety of improved services and apps. The term “smart city” refers to integrating contemporary digital technology in the setting of a city to improve urban services. There are possibilities to create new services and connect disparate application areas with each other as a result of the use of information and communication technologies in the smart city. However, to make sure the services in an IoT-enabled smart city environment remain running without depleting valuable energy resources, all of the apps have to be maintained using energy resources that are kept at a minimum. IoT can enhance a city’s lighting system since it uses more energy than other municipal systems. An intelligent city integrates lighting system sensors and communication channels with enhanced intelligence features for a Smart Lighting System (SLS). To control lighting more efficiently, SLS systems are built to be autonomous and efficient. We cover the SLS and evaluate several IoT-enabled communication protocols in this article. Furthermore, we evaluated several use scenarios for IoT enabled indoor and outdoor SLS and generated a report detailing the energy consumption in different use cases. By using IoT-enabled smart lighting systems, our research has shown that energy savings are possible in both indoor and outdoor settings, which is equivalent to a forty percent reduction in energy usage. Finally, we went through the SLS in the smart city research plans.

Development of an Indoor Intelligent Lighting System Based on Occupants’ Positioning

2021 ◽  
pp. 2159041
Author(s):  
Heng Luo ◽  
Tingfei Zhang ◽  
Youmin Zou ◽  
Chenxu Liu ◽  
Xinyu Hu ◽  
...  
Keyword(s):  
Energy Efficiency ◽  
Energy Consumption ◽  
Error Rate ◽  
Reference Signal ◽  
High Energy ◽  
Transmission Model ◽  
Lighting System ◽  
Total Energy Consumption ◽  
Smart Lighting ◽  
Lighting Systems

China accounts for more than 22% of the total energy consumption worldwide. Building energy consumption, among which consumption in public buildings was about 40% took the second place. With the problems of high energy waste, error rate and complexity of the control systems available, an indoor intelligent lighting system based on occupants’ location is proposed in this paper to improve the energy efficiency of the current lighting systems indoors. The transmission model of electromagnetic wave in free space is optimized in both aspects of reference signal strength and attenuation coefficient radiation in complex environment dynamically based on which occupants’ positions are obtained. The smart lighting system will turn on or off corresponding lights adaptively to provide a more energy efficient platform. Experimental results show that the proposed system is able to improve the energy efficiency of indoor lighting by at least 15%, with a lower error rate below 2% compared with the existing lighting systems based on voice control.

Analysis on Light Environment and Efficient Creation in College Student Dormitory of Chongqing

2014 ◽  
Vol 587-589 ◽  
pp. 276-282
Author(s):  
Meng Liu ◽  
Zi Qiao Li ◽  
Li Yang Ruan ◽  
Run Mu Yang ◽  
Jun Ya Wu
Keyword(s):  
Energy Efficiency ◽  
College Student ◽  
Electricity Consumption ◽  
Field Investigation ◽  
National Standards ◽  
Lighting System ◽  
Efficiency Optimization ◽  
Lamp System ◽  
Lighting Systems ◽  
Indoor Lighting

This paper aims to probe into the feasibility and applying strategy of the energy-efficiency optimization of college dormitory lighting system in Chongqing. It takes a college dormitory located in chongqing as an instance, through questionnaire and field investigation, the conclusion indicated that the indoor illumination during the daytime cannot meet the relevant national standards. And over 80 percent of the students are unsatisfied with the indoor lighting. The research on the optimization program of Photoconductive lighting system and energy efficiency lamp system demonstrate these two programs can save 5.7 tons of standard coal per year and 1.67 respectively. Then model the photoconductive lighting system. Finally it takes the Photoconductive lighting system and energy efficiency lighting systems promoted and compared in college dormitory of Chongqing to draw a conclusion that the annual savings of the system are approximately 21.8-22.4 million kwh electricity which equals to 8.72-8.94 one thousand tons of standard coal. This quantity is equivalent to a half of the electricity consumption of Chongqing Dadukou 2012 January-April.

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.

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