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

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.

2014 ◽  
Vol 587-589 ◽  
pp. 276-282
Author(s):  
Meng Liu ◽  
Zi Qiao Li ◽  
Li Yang Ruan ◽  
Run Mu Yang ◽  
Jun Ya Wu

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.


Energies ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 527
Author(s):  
Babak Zandi ◽  
Adrian Eissfeldt ◽  
Alexander Herzog ◽  
Tran Quoc Khanh

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.


2021 ◽  
Author(s):  
Jingjing Zhang ◽  
Weihua Zeng ◽  
Shengli Hou ◽  
Yuqi Chen ◽  
Linyan Guo ◽  
...  

Abstract Street lighting, as the most essential and universal component of the urban lighting system, accounts for a large portion of public electricity usage. Therefore, improving street lamps working efficiency is vital for energy savings. This paper demonstrates the design of a smart street lighting system supported by the combination of NB-IoT and LoRa communication technology. By adopting an optimized street lamp control algorithm, the system can realize the automatic control of street lights according to the real-time traffic flow information. This system has been installed on Luyang Avenue, Lucheng City, Shanxi Province, China in May 2019. It managed to reduce the electricity consumption in this region significantly in June 2019, which was 18% lower than that in April 2019 and 19.7% lower than that in June 2018. By illustrating the unique advantages of this system in energy savings and cost reduction, this paper displays its potential for further application in the construction of smart cities on a large scale.


2019 ◽  
Vol 9 (5) ◽  
pp. 1025 ◽  
Author(s):  
Raffaele Carli ◽  
Mariagrazia Dotoli ◽  
Roberta Pellegrino

Investing in the optimal measures for improving the energy efficiency of urban street lighting systems has become strategic for the economic, technological and social development of cities. The decision-making process for the selection of the optimal set of interventions is not so straightforward. Several criticalities-such as difficulties getting access to credit for companies involved in street lighting systems refurbishment, budget constraints of municipalities, and unawareness of the actual energy and economic performance after a retrofitting intervention-require a decision-making approach that supports the city energy manager in selecting the optimal street lighting energy efficiency retrofitting solution while looking not only based on the available budget, but also based on the future savings in energy expenditures. In this context, the purpose of our research is to develop an effective decision-making model supporting the optimal multi-period planning of the street lighting energy efficiency retrofitting, which proves to be more effective and beneficial than the classical single-period approach and has never before been applied to the considered public lighting system context. The proposed methodology is applied to a real street lighting system in the city of Bari, Italy, showing the energy savings and financial benefit obtained through the proposed method. Numerical experiments are used to investigate and quantify the effects of using a multi-period planning approach instead of a single-period approach.


2021 ◽  
Vol 4 (1) ◽  
pp. 71-80
Author(s):  
Isty Cahyani Ismail ◽  
Ramli Rahim ◽  
Baharuddin Hamzah

One of the largest energy consumers in the world is buildings. The energy consumption comes from the lighting system. Energy use in buildings is generally 25% for lighting systems. The strategy used in building design is to reduce energy consumption while maintaining the best comfort in a building. The application of energy-saving concepts from the building sector is optimizing the lighting system by integrating natural and artificial lighting systems. This study aims to determine the light intensity in the integrated lighting system of natural and artificial manually and also to find out how much energy can be saved with the integrated lighting system manually. The research location is at the Mega Bank Makassar Tower Building. The research sample was selected by purposive sampling and the sixth floor was chosen as the research location. In this study, simulations were carried out using the DIAlux 4.13 program to integrate natural and artificial light and to calculate the amount of energy efficiency in the workspace. To obtain optimal light intensity and energy savings, a simulation was carried out by turning off half the light points in the workspace, especially the light points around the building openings. The simulation results show that the average integrated lighting quality meets the minimum lighting requirements and can save energy usage by up to 50%. Keywords: energy efficiency; integration lighting; workspace


2018 ◽  
Vol 10 (12) ◽  
pp. 4365 ◽  
Author(s):  
Ovidio Rabaza ◽  
Evaristo Molero-Mesa ◽  
Fernando Aznar-Dols ◽  
Daniel Gómez-Lorente

This article describes an innovative method for measuring lighting levels and other lighting parameters through the use of aerial imagery of towns and cities. Combined with electricity consumption data from smart electricity meters, it was possible to measure the energy efficiency of public lighting installations. The results of this study also confirmed that lighting measurements, installation material, luminaire position, and electricity consumption data can be easily integrated into geographic information systems (GIS). The main advantage of this new methodology is that it provides information about lighting installations in large areas in less time than more conventional procedures. It is thus a more effective way of obtaining the data required to calculate the energy efficiency of lighting levels and electricity consumption. There is even the possibility of generating street lighting maps that provide local administrations with up-to-date information regarding the status of public lighting installations in their city. In this way, modifications or improvements can be made to achieve greater energy savings and, if necessary, to correct the distribution or configuration of public lighting systems to make them more efficient and sustainable. This research studied levels of street lighting and calculated the energy efficiency in various streets of Deifontes (Granada), through the use of aerial imagery.


2018 ◽  
Vol 35 (3) ◽  
pp. 181-187
Author(s):  
Wojciech Grzesiak ◽  
Piotr Guzdek ◽  
Piotr Maćków ◽  
Krzysztof Zaraska ◽  
Michal Zbieć ◽  
...  

Purpose The purpose of this paper is to present issues related to the design of a modern lighting system based on LED technology. The developed system provides lighting with a high colour rendering index (up to 98); it also has many innovative functions, which make its implementation bring significant energy savings and increase the comfort of work. Design/methodology/approach In contrast to typical solutions, the dynamic synthesis of white light from six component colours was used in the presented project. This process is controlled by a microcontroller, and there is a colour temperature sensor in the feedback loop. The communication between smart luminaires and sensor modules is provided by means of a ZigBee wireless network. Findings The correctness of the proposed methodology has been proved by measurements and laboratory tests. Research limitations/implications The process of improving the lighting system is continued and significant changes in the spectrum of used sensors are expected. Practical implications The proposed system based on mixing light from six components is an innovative solution that besides undoubted advantages entails a more elaborate electronic circuitry. However, good characteristics of the obtained light, as well as the possibility of compensating for changes in colour temperature of natural light and reducing the impact of aging of LEDs, in the authors’ opinion, make the proposed solution find its place on the market. Originality/value The proposed solution is original, both in terms of the light mixing technique and advanced functionality offered by the system.


2015 ◽  
Vol 43 (15) ◽  
pp. 1696-1706 ◽  
Author(s):  
Gionata Cimini ◽  
Alessandro Freddi ◽  
Gianluca Ippoliti ◽  
Andrea Monteriù ◽  
Matteo Pirro

2013 ◽  
Vol 284-287 ◽  
pp. 2215-2219
Author(s):  
Ching Hai Lin ◽  
Hsin Chuan Kuo ◽  
Chao Tsung Lee

In this paper, an intelligent garbage can model-based differential evolution algorithm (IGCMDE) is proposed to simulate human social organization by its population system, based on the differential evolution algorithms (DEs) and the logical framework of the garbage can decision model with group meeting. When faced with issues such as unclear goals and technologies, participators turnover, etc., representatives of all participating parties will communicate, argue, compromise and adapt with each other, in order to find a solution to the problems. Group meetings are conducted to choose the best solution in a more objective, reasonable and efficient way. At last, we used IGCMDE to optimize the fuzzy controller with fuzzy logic control theory. We present a method for daylight blending control with two novel contributions: 1) smart luminance sensing; 2) daylight luminance control. The proposed method was implemented as an intelligent lighting system in a parking tower environment. The result demonstrated that IGCMDE possesses an excellent search performance and the intelligent lighting system showed significant energy savings.


2021 ◽  
Vol 1 (4) ◽  
pp. 261-271
Author(s):  
LILIS ROKHAYAH

Based on the phenomenon that we encounter in Mathematics Learning from Primary School to Upper Secondary School or Vocational High School, it is still not satisfactory. Mathematics learning tends to still be at the achievement of curriculum targets or books used as compulsory books. Learning is still dominated by teachers, where learners are more likely to accept the knowledge provided by teachers without the process of processing the existing potential. Learning does not emphasize on the understanding of the material studied and is not associated with the actual experience of the participants. In other words, the learning of mathematics is not meaningful because the learning has not been associated with the scheme that has been possessed by learners. Based on the above phenomenon, research was conducted on the use of three-dimensional learning media in improving the understanding of the concept of point distance, line, and field of XII OTKP-2 students in SMK Negeri 1 Bandung academic year 2021-2022. This research is a classroom action research that aims to improve students' understanding of mathematics learning concepts by using three-dimensional learning media on the material of point distances, lines, and fields in XII OTKP-2 class SMK Negeri 1 Bandung academic year 2021-2022. Each learner can use this three -dimensional learning media in accordance with their interests, and potential. Because the learning media used is the result of the learners themselves, it means that this learning media will be better understood by learners and more interested. ABSTRAKBerdasarkan fenomena yang kita temui dalam Pembelajaran Matematika mulai dari Sekolah Dasar sampai dengan Sekolah Menengah Atas atau Sekolah Menengah Kejuruan masih belum memuaskan. Pembelajaran Matematika cenderung masih pada pencapaian target kurikulum atau buku yang digunakan sebagai buku wajib. Pembelajaran masih didominasi guru, dimana peserta didik lebih cenderung menerima pengetahuan yang diberikan guru tanpa proses pengolahan potensi yang telah ada. Pembelajaran kurang menekankan pada pemahaman akan materi yang dipelajari dan tidak dikaitkan dengan pengalaman nyata peserta didk. Dengan kata lain, pembelajaran matematika belum bermakna karena pembelajaran belum dikaitkan dengan skema yang telah dimiliki oleh peserta didik. Berdasarkan fenomena di atas, dilakukan penelitian tentang penggunaan media pembelajaran tiga dimensi dalam meningkatkan pemahaman konsep materi jarak titik, garis, dan bidang peserta didik kelas XII OTKP-2 SMK Negeri 1 Bandung tahun pelajaran 2021-2022. Penelitian ini merupakan penelitian tindakan kelas yang bertujuan untuk meningkatkan pemahaman konsep belajar matematika peserta didik dengan menggunakan media pembelajaran tiga dimensi pada materi jarak titik, garis, dan bidang di kelas XII OTKP-2 SMK Negeri 1 Bandung tahun pelajaran 2021-2022. Setiap peserta didik dapat menggunakan media pembelajaran tiga dimensi ini sesuai dengan minat, dan potensi yang dimilikinya. Karena media pembelajaran yang digunakan adalah hasil dari buatan peserta didik sendiri, artinya media pembelajaran ini akan lebih dipahami oleh peserta didik dan lebih tertarik.


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