LED Museum Lighting: Back to Natural Light

2019 ◽  
pp. 81-88
Author(s):  
Andrei V. Aladov ◽  
Alexander L. Zakgeim ◽  
Anton E. Chernyakov

Article overviews prospects of application of adjustable polychrome LED luminaires based on RGB mixture principle for museum lighting. Such light sources allow creating of high-quality lighting systems with capability to adjust luminous flux and chromaticity characteristics with a wide range of correlated colour temperatures between 2800 K and 6500 K and high values of all colour rendering indexes: R1-R14. Application of adjustable LED light sources makes it possible to do artificial museum lighting similar to natural environment at the moment of creating of a piece of art by an artist, hence, to make its perception more precise. Possibility to adjust the correlated colour temperature allows creating individual lighting of paintings in compliance with the genre and subject of a work (a portrait, a landscape, time period, etc.). The article also briefly describes major theoretical, circuit design and software aspects of creation of a dynamically adjustable LED system of museum lighting and gives first examples of its application.

2019 ◽  
pp. 101-107
Author(s):  
Sergei A. Stakharny

This article is a review of the new light source – organic LEDs having prospects of application in general and special lighting systems. The article describes physical principles of operation of organic LEDs, their advantages and principal differences from conventional non-organic LEDs and other light sources. Also the article devoted to contemporary achievements and prospects of development of this field in the spheres of both general and museum lighting as well as other spheres where properties of organic LEDs as high-quality light sources may be extremely useful.


2019 ◽  
pp. 82-87
Author(s):  
Nina P. Nestyorkina ◽  
Olga Yu. Kovalenko ◽  
Yulia A. Zhuravlyova

The article analyses the operational characteristics of 10W LED lamps with T8 bulb manufactured by ASD (Russia), Smartbuy (Taiwan), and VOLPE (PRC) and 18W FL with T8 bulb manufactured by PHILIPS (Poland) including the dependence of these lamps on the supply voltage. The results of measurements show that: a) the period of stabilisation of electric parameters and luminous flux of LED lamps does not cause discomfort of illumination unlike the said FL, the luminous flux of which at the moment of switching on is 70 % of the nominal value, which is reached after 13 minutes; b) with nominal voltage of supply network, the value of luminous flux of 10W ASD LED-T8R-STD LED lamp (Russia) is 6 % less than the declared one, and that of Smartbuy SBL-T8-10-64K-A (Taiwan) and VOLPE LED-T8-10W/DW/G13/FR/FIX/N (PRC) is even less; c) the general colour rendering index of all studied LED lamps is less than the declared one (72 instead of 80); d) the flicker index of all studied LED lamps does not exceed the declared value of 5 %; e) the characteristics of LED lamps almost do not depend on changes of the supply voltage within the range of ±10 %. The recommendations regarding the application of the studied LED lamps are given.


2010 ◽  
Vol 2010 ◽  
pp. 1-9 ◽  
Author(s):  
Andrew Chalmers ◽  
Snjezana Soltic

This paper is concerned with designing light source spectra for optimum luminous efficacy and colour rendering. We demonstrate that it is possible to design light sources that can provide both good colour rendering and high luminous efficacy by combining the outputs of a number of narrowband spectral constituents. Also, the achievable results depend on the numbers and wavelengths of the different spectral bands utilized in the mixture. Practical realization of these concepts has been demonstrated in this pilot study which combines a number of simulations with tests using real LEDs (light emitting diodes). Such sources are capable of providing highly efficient lighting systems with good energy conservation potential. Further research is underway to investigate the practicalities of our proposals in relation to large-scale light source production.


Micromachines ◽  
2021 ◽  
Vol 13 (1) ◽  
pp. 73
Author(s):  
Marina Garcia-Cardosa ◽  
Francisco-Javier Granados-Ortiz ◽  
Joaquín Ortega-Casanova

In recent years, additive manufacturing has gained importance in a wide range of research applications such as medicine, biotechnology, engineering, etc. It has become one of the most innovative and high-performance manufacturing technologies of the moment. This review aims to show and discuss the characteristics of different existing additive manufacturing technologies for the construction of micromixers, which are devices used to mix two or more fluids at microscale. The present manuscript discusses all the choices to be made throughout the printing life cycle of a micromixer in order to achieve a high-quality microdevice. Resolution, precision, materials, and price, amongst other relevant characteristics, are discussed and reviewed in detail for each printing technology. Key information, suggestions, and future prospects are provided for manufacturing of micromixing machines based on the results from this review.


Author(s):  
Т. Р. Магомаев

В современных условиях функционирования системы высшего образования целью внедрения дистанционного обучения является организация качественного учебно-воспитательного процесса «на расстоянии» с использованием новейших информационно-коммуникационных средств и открытым доступом к образовательным ресурсам. Именно такая форма обучения может быстро адаптироваться к требованиям информационного общества и подготовить будущего специалиста к вызовам цифровой среды. В сочетании с традиционными формами, дистанционное образование в высшем учебном заведении может предоставить широкий спектр образовательных услуг как для абитуриентов и студентов для приобретения необходимых навыков и умений для будущей профессиональной деятельности, так и для преподавателей с целью повышения квалификации. На данный момент основными проблемами внедрения качественного свободного образовательного пространства является отсутствие технической и финансовой поддержки, законодательной основы дистанционного обучения, и это является ведущим фактором сдерживания развития технологий в вузе. Отсутствуют специально подготовленные к работе в дистанционном режиме квалифицированные преподаватели. Однако, учитывая готовность вузов осуществлять обучение преподавателей для работы в дистанционном режиме, негативное влияние этого фактора в ближайшее время может быть устранено. При условии решения вышеописанных проблем будет создано эффективное дистанционное обучение, которое всесторонне раскроет потенциал студента, учитывая как индивидуальные, так и общечеловеческие потребности. In modern conditions of functioning of the higher education system, the goal of introducing distance learning is to organize a high-quality educational process “at a distance” using the latest information and communication tools and open access to educational resources. It is this form of training that can quickly adapt to the requirements of the information society and prepare the future specialist for the challenges of the digital environment. In combination with traditional forms, distance education in a higher educational institution can provide a wide range of educational services for both applicants and students to acquire the necessary skills for future professional activities, and for teachers to improve their skills. At the moment, the main problems in introducing high-quality free educational space is the lack of technical and financial support, the legislative basis of distance learning, and this is a leading factor in curbing the development of technology at the university. There are no qualified teachers specially prepared for working in remote mode. However, given the willingness of universities to train teachers to work remotely, the negative impact of this factor in the near future can be eliminated. Subject to the solution of the above problems, an effective distance learning will be created that will comprehensively reveal the student’s potential, taking into account both individual and universal needs.


2019 ◽  
pp. 67-72
Author(s):  
L. Nazarenko ◽  
H. Kononenko ◽  
Т. Mozharovska ◽  
V. Chernets

The article reveals the question of achieving security for people on the streets at night with the help of artificial lighting. The author analyzed the factors affecting traffic safety and the possibility of creating the necessary visual conditions for this by means of street lighting. In addition, the article raised an important question regarding the characteristics of the roadway. It is noted that the modern pavement is not standardized on the lighting characteristics. Knowing the spectral characteristics of the applied light sources, these data could be applied in the development of new types of canvases that would allow achieving a new level of illumination in terms of both improving the quality and its efficiency and economy. Without this, it is impossible to talk about the maximum efficiency of the use of the luminous flux as a whole. For existing lighting systems, the brightness calculation is performed by measuring the illumination and reflectivity of the road surface. The obtained brightness values are entered into the mesopic photometric system in order to determine the parameters of the complete system, which provides equivalent visual perception of the illuminated objects and is intended to replace the existing installation. To determine the required lamp power when replacing existing luminaires, it is recommended to use a mesopic photometric system, which allows you to perform calculations taking into account the S/P ratios. In this regard, it is necessary to thoroughly review the computer programs used in the creation of the lighting project, as well as to ensure active participation in international cooperation in the formation of modern lighting standards.


2018 ◽  
Vol 51 (8) ◽  
pp. 1249-1262
Author(s):  
D Raul ◽  
K Ghosh

In today's world, light-emitting diodes are quickly replacing conventional light sources, both indoors and outdoors. Being a solid-state device, adverse ambient conditions such as high temperature and humidity lead to its poor performances, light quality and longevity. In outdoor applications, exposure to high ambient temperature during daytime, even when the lamp power is off, causes the lamp performance to deteriorate. In tropical countries, the environmental temperature in most of the days is higher than 25℃ and sometimes reaches 50℃. Here, the humidity varies between 30% and 80% and frequently over 80%. Thus, the reliability of the light emitting diodes is a question that needs a thorough study. In line with this, in this study, an effort has been made through an experiment. Here, commercially available surface-mounted device and chip-on-board-based light-emitting diodes are tested through an environmental chamber, and their measured illuminance values were observed by varying the relative humidity. Then, the temperature ageing or stress was set at 60℃ on the above types of light-emitting diodes at power off condition for 6000 hours and after that its luminous flux and spectral distribution were observed. The degradation observed under these conditions may guide designers and manufacturers to upgrade their lighting systems to make them fit for tropical conditions.


2021 ◽  
Vol 247 ◽  
pp. 01040
Author(s):  
Dmitry Gladin ◽  
Alexey Kavtarashvili

The article discusses the influence of light pulsation on the physiological state of humans and birds, some aspects of its occurrence, the main characteristics and the alleged role in the deterioration of chickens’ zootechnical indicators under the conditions of using light sources with light flux pulsations of different frequencies. The current state of lighting equipment in poultry farming is characterized by the rapid development of technologies and the active introduction of LED lighting. Having undeniable advantages, LED lighting systems have some technical features that are currently insufficiently studied and can affect the zootechnical indicators of poultry. A clear definition of the threshold values of the characteristics of the pulsation of illumination in the poultry house will make it possible to produce lighting equipment for poultry farming with a safe value of the pulsations of the luminous flux of light sources in their composition. The analysis of numerous literature sources has shown that the influence of light pulsation on the physiological state of humans and zootechnical indicators in birds is associated with a complex effect, depending on such characteristics as the depth and frequency of the pulsation of the light flux of light sources. Despite some differences in the values of the threshold impact of light pulsation, the nature of its impact is similar in humans and birds, which allows us to develop and apply targeted measures to reduce the impact of light pulsation on poultry and the deterioration of its zootechnical indicators.


2016 ◽  
Vol 48 (8) ◽  
pp. 943-965 ◽  
Author(s):  
MB Yurtseven ◽  
S Mete ◽  
S Onaygil

High-power LEDs with high luminous efficacies, compact sizes, long lifetimes and a wide colour range, are rapidly taking the place of conventional light sources in general lighting applications. But these properties of high-power LEDs are dependent on temperature and driving current. In this study, 24 samples of commercially available, high-power, white LEDs were measurement for their electrical, optical and thermal characteristics as well as their efficiency, luminous flux, luminous efficacy, correlated colour temperature and colour rendering index over six temperature steps at three different driving currents. LED manufacturers' catalogues including such information will allow consistency between the design and application stages of an installation. Also, it will make the technical and economic optimization of luminaires using high-power LEDs easier.


2018 ◽  
pp. 113-119
Author(s):  
Gennady Ya. Vagin ◽  
Eugene B. Solntsev ◽  
Oleg Yu. Malafeev

The article analyses critera applying to the choice of energy efficient high quality light sources and luminaires, which are used in Russian domestic and international practice. It is found that national standards GOST P 54993–2012 and GOST P 54992– 2012 contain outdated criteria for determining indices and classes of energy efficiency of light sources and luminaires. They are taken from the 1998 EU Directive #98/11/EU “Electric lamps”, in which LED light sources and discharge lamps of high intensity were not included. A new Regulation of the European Union #874/2012/EU on energy labelling of electric lamps and luminaires, in which these light sources are taken into consideration, contains a new technique of determining classes of energy efficiency and new, higher classes are added. The article has carried out a comparison of calculations of the energy efficiency classes in accordance with GOST P 54993 and with Regulation #874/2012/EU, and it is found out that a calculation using GOST P 54993 gives underrated energy efficiency classes. This can lead to interdiction of export for certain light sources and luminaires, can discredit Russian domestic manufacturer light sources and does not correspond to the rules of the World Trade Organization (WTO).


Sign in / Sign up

Export Citation Format

Share Document