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Journal articles on the topic 'LED-halogen illuminator'

Author: Grafiati

Published: 28 May 2022

Last updated: 31 July 2025

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1

Shchuruk, Georgy Z., Olexander Z. Shchuruk, and Anton G. Shchuruk. "The evolution of headlight devices in the work of otorhinolaryngologists." OTORHINOLARYNGOLOGY, No2(4) 2021 (March 24, 2021): 66–71. http://dx.doi.org/10.37219/2528-8253-2021-2-66.

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Invention and improving the methods of ENT examination are closely connected with the technological inventions of the 19th and 20th centuries. The invention of the classical exam head mirror in 1861 and improvement of the manufacturing of compact and powerful sources of light (filament lamps) at the time caused the researchers to create new devices for ENT examination. In particular, a head-mounted electro-mirror was created, the principle of which later became the basis for the development of fiber-optic headlamps. The emergence of powerful halogen and xenon light sources in the mid-20th cent

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Efe, Serhat Berat, and Derman Varhan. "Interior Lighting of a Historical Building by Using LED Luminaires: A Case Study of Fatih Paşa Mosque." Light & Engineering, no. 04-2020 (August 2020): 77–83. http://dx.doi.org/10.33383/2020-09.

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In this study, a place of worship lighting in accordance with CIE standards was examined. Halogen lamps were used in the place of worship lighting, which was physically applied. Halogen lamp lighting and LED illuminated place of worship environment were compared in terms of luminance level and economic cost in a simulation environment. The illumination level should be 100 lx or above for places of worship according to CIE standards. Lighting using LED lamps, which provide 100 lx illuminance levels, has yielded 85 % more efficient results than illumination by halogen lamps.

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Koós, Dániel, and István Bodnár. "Designing Procedure of Led-Halogen Hybrid Solar Simulator to Small Size Solar Cell Testing." Műszaki Tudományos Közlemények 9, no. 1 (2018): 123–26. http://dx.doi.org/10.33894/mtk-2018.09.26.

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Abstract During the experimental investigation of solar cells, the quality of the illumination is essential. In the case of solar simulators, the main goal is the accurate reproduction of sunlight. The designing procedure of a halogen LED hybrid solar simulator is described in this article. One of the main goals is the compliance with the relevant standard (ASTM E972).

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Guillén, Cecilia. "Evaluating Photovoltaic Conversion Performance under Artificial Indoor Lighting." Electronics 13, no. 17 (2024): 3378. http://dx.doi.org/10.3390/electronics13173378.

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Several photovoltaic technologies, based on different semiconductor absorbers with band-gap energy in the range Eg = 1.0–1.5 eV are currently sharing the market for outdoor applications. These photovoltaic cells are designed to achieve an optimal photovoltaic conversion under solar illumination (represented by the standard AM1.5 global spectrum), but their performance changes under different artificial indoor lights. Here, the detailed balance principle that was first applied for an ideal photovoltaic absorber under solar radiation is now used by considering the actual spectra of four typical

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Junita, Egri, and Harmadi Harmadi. "Perancangan Sistem Akuakultur pada Fotobioreaktor Mikroalga Chlorella vulgaris." Jurnal Fisika Unand 9, no. 3 (2020): 345–51. http://dx.doi.org/10.25077/jfu.9.3.345-351.2020.

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Telah dilakukan perancangan sistem akuakultur pada fotobioreaktor mikroalga Chlorella vulgaris. Sistem akuakultur pada fotobioreaktor dirancang menggunakan sumber cahaya yang berbeda yaitu cahaya matahari, lampu halogen dan LED biru. Sistem ini berisi 1040 mL mikroalga yang dialiri gas CO2 dengan kecepatan alir 1,5 L/min dan dirancang dengan alat kontrol temperatur menggunakan sensor LM35. Temperatur pada sistem dipertahankan pada rentang (25-35)°C. Intensitas cahaya pada lampu halogen divariasikan yaitu 1000 Lux, 3000 Lux dan 5000 Lux. Sistem akuakultur yang dirancang dapat meningkatkan kadar

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Wren, S. N., D. J. Donaldson, and J. P. D. Abbatt. "Photochemical chlorine and bromine activation from artificial saline snow." Atmospheric Chemistry and Physics Discussions 13, no. 5 (2013): 14163–93. http://dx.doi.org/10.5194/acpd-13-14163-2013.

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Abstract. The activation of reactive halogen species – particularly Cl2 – from sea ice and snow surfaces is not well understood. In this study, we used a photochemical snow reactor coupled to a chemical ionization mass spectrometer to investigate the production of Br2, BrCl and Cl2 from NaCl/NaBr-doped artificial snow samples. At temperatures above the NaCl-water eutectic, illumination of samples (λ > 310 nm) in the presence of gas phase O3 led to the accelerated release of Br2, BrCl and the release of Cl2 in a process that was significantly enhanced by acidity, high surface area and additi

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Wren, S. N., D. J. Donaldson, and J. P. D. Abbatt. "Photochemical chlorine and bromine activation from artificial saline snow." Atmospheric Chemistry and Physics 13, no. 19 (2013): 9789–800. http://dx.doi.org/10.5194/acp-13-9789-2013.

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Abstract. The activation of reactive halogen species – particularly Cl2 – from sea ice and snow surfaces is not well understood. In this study, we used a photochemical snow reactor coupled to a chemical ionization mass spectrometer to investigate the production of Br2, BrCl and Cl2 from NaCl/NaBr-doped artificial snow samples. At temperatures above the NaCl-water eutectic, illumination of samples (λ > 310 nm) in the presence of gas phase O3 led to the accelerated release of Br2, BrCl and the release of Cl2 in a process that was significantly enhanced by acidity, high surface area and additi

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Schuerger, Andrew C., and Jeffrey T. Richards. "Effects of artificial lighting on the detection of plant stress with spectral reflectance remote sensing in bioregenerative life support systems." International Journal of Astrobiology 5, no. 2 (2006): 151–69. http://dx.doi.org/10.1017/s1473550406003053.

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Plant-based life support systems that utilize bioregenerative technologies have been proposed for long-term human missions to both the Moon and Mars. Bioregenerative life support systems will utilize higher plants to regenerate oxygen, water, and edible biomass for crews, and are likely to significantly lower the ‘equivalent system mass’ of crewed vehicles. As part of an ongoing effort to begin the development of an automatic remote sensing system to monitor plant health in bioregenerative life support modules, we tested the efficacy of seven artificial illumination sources on the remote detec

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Markina, O. M. "Lighting setting features of opto-electronic measuring system for controlling adhesive joints optical components." Journal of Achievements in Materials and Manufacturing Engineering 2, no. 84 (2017): 49–57. http://dx.doi.org/10.5604/01.3001.0010.7781.

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Purpose: The purpose of this article is to study the features of setting and selecting the source of illumination of the optoelectronic measuring system for the control of adhesive joints of optical parts. Design/methodology/approach: The research and analysis of the lighting characteristics of halogen and LED lamps, used as a source of illumination in the measuring system, was carried out. Findings: In the course of experimental studies, the sensitivity and resolution of fixing defects of adhesive joints of optical parts were increased and the measurement error was reduced from 10 ± 1.2 micro

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NGUYEN, Van Son, Véronique JUBERA, Alain GARCIA, Claude LUCAT, and Hélène DEBEDA. "Towards hydrogen detection at room temperature with printed ZnO nanoceramics films activated with halogen light." Additional Conferences (Device Packaging, HiTEC, HiTEN, and CICMT) 2015, CICMT (2015): 000224–29. http://dx.doi.org/10.4071/cicmt-wp13.

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Though semiconducting properties of ZnO have been extensively investigated under hazardous gases, research is still necessary for low-cost sensors working at room temperature. Study of printed ZnO nanopowders based-sensor has been undertaken for hydrogen detection. A ZnO paste made with commercial nanopowders is deposited on interdigitated Pt electrodes and sintered at 400°C. ZnO layer structure and morphology are first examined by XRD, SEM and emission/excitation spectra prior to the study of the effect of UV-light on the electrical conduction of the semiconductor oxide. Then, the response to

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Kocaman, Behcet. "Energy Efficiency in Lighting for Historical Buildings: Case Study of the El Aman Caravanserai in Province of Bitlis, Turkey." Light & Engineering, no. 04-2020 (August 2020): 68–76. http://dx.doi.org/10.33383/2019-093.

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Historical buildings are bridges between the past and the present. Moreover, it is a mirror of the life of societies, which lived in other ages. Historic buildings need to be illuminated to provide better visual conditions. The demand for electricity is increasing day by day. Energy must be used efficiently to reduce the amount of energy being dissipated. Therefore, energy efficiency in the lighting for historical buildings is a topic of great importance. Various luminaires are used for interior and exterior lighting of historic buildings. However, new lighting technologies, such as light emit

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Dang, R., Y. Yuan, C. Luo, and J. Liu. "Chromaticity shifts due to light exposure of inorganic pigments used in traditional Chinese painting." Lighting Research & Technology 49, no. 7 (2016): 818–28. http://dx.doi.org/10.1177/1477153516644866.

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Museum lighting must use a light source suitable for preserving the colours of the objects being lit. This paper examines how prolonged exposure to three light sources typically used in museums affect the chromaticity of five pigments commonly used in Chinese traditional heavy colour painting. The three light sources were tungsten halogen with an infrared filter, metal halide and an RYGB-type LED. The chromaticities of the pigments were measured at regular intervals over 1152 hours of exposure. These data were used to reveal the chromaticity shifts occurring and hence the relative effect of ea

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Shiga, William Tsuyoshi, Marcos Norio Watanabe, Fabio Izumi, and Sebastião Gomes Dos Santos Filho. "Fabrication, Electrical Characterization and Modeling of SiO/SiO2 Passivation Coatings on MOS Solar Cells for Energy Harvesting." Journal of Integrated Circuits and Systems 20, no. 1 (2025): 1–10. https://doi.org/10.29292/jics.v20i1.890.

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This article shows the fabrication, electrical characterization and modeling of SiO/SiO2 layers for passivation of Indoor MOS solar cells operating in inversion mode. After the electrical characterization of Al/SiO/SiO2/p-Si structures as MOS (Metal-Oxide-Semiconductor) capacitors, the effective positive charge in the SiO layer was obtained from the Capacitance x Voltage (CV) characteristics. This positive charge will promote the formation of the depletion mode at the exposed regions SiO/SiO2/p-Si around the metal grid that is the gate of Al/SiO2/p-Si solar cells. The tunneling process through

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Formánek, Roman, Bohuš Kysela, and Radek Šulc. "Image analysis of particle size: effect of light source type." EPJ Web of Conferences 213 (2019): 02021. http://dx.doi.org/10.1051/epjconf/201921302021.

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Agitation of two immiscible liquids or solid-liquid suspension is a frequent operation in chemical and metallurgical industries. The sizes of particles, bubbles or droplets can be determined by the Image Analysis Technique. It is known that the quality of captured images depends significantly on the original image background that is mainly affected by the type of the light source. The aim of this contribution is to investigate the effect of light source type on image quality. The four types of light sources were tested: 1) 1000 W halogen lamp, 2) 72 W LED bar panel, 3) 60 W LED chip, and 4) 90

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Tangjanyatam, Sagol. "Retrospective Comparison of Intraoperative Parameters, Efficacy and Safety in Cataract Surgery Between Halogen and Light-Emitting Diode (LED) Illuminated Surgical Microscope." Clinical Ophthalmology Volume 15 (September 2021): 3721–26. http://dx.doi.org/10.2147/opth.s328450.

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Kumar, S. "DEVELOPING AN EFFECTIVE LOW COST BLUE-GREEN LED PHOTOTHERAPY METHOD FOR NEONATAL JAUNDICE TREATMENT." International Journal of Engineering Applied Sciences and Technology 6, no. 7 (2021): 104–9. http://dx.doi.org/10.33564/ijeast.2021.v06i07.017.

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Jaundice is an unusual situation in neonatal toddlers and is a scientific signal of excess conjugated or unconjugated hyperbilirubinemia. Phototherapy is the maximum broadly used treatment, and it has proved safe and powerful for over recent years. Compact fluorescent tubes, halogen bulbs, fiber optic blankets, and LEDs are commonly used light sources for phototherapy with varying efficiencies. In recent years, there are several studies reported blue-green LED phototherapy to be effective than conventional phototherapy in term neonates. This research aimed to develop the effectiveness of blueg

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Bukeikhanov, N., А. Nikishechkin, and S. Gvozdkova. "Automation of lighting systems of enterprises using solar energy." Bulletin of Science and Practice 4, no. 5 (2018): 277–84. https://doi.org/10.5281/zenodo.1246206.

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The prospects of innovative lights of the new generation. These lights by the day conduct natural sunlight in the hollow, fibre-optic light guides through the roof into the interior rooms of enterprises, where there is no possibility to use windows or not enough daylight. At night and on cloudy days illumination is provided by incandescent lamps, halogen and LED lamps, the light of which is transmitted through the same light guides. This is especially important for fire-hazardous premises. Program implementation of the developed automated systems has the ability to quickly changeovers and chan

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Kwaśny, Mirosław, Aneta Bombalska, and Karolina Obroniecka. "A Reliable Method of Measuring the Conversion Degrees of Methacrylate Dental Resins." Sensors 22, no. 6 (2022): 2170. http://dx.doi.org/10.3390/s22062170.

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The main aim of the study was to implement the most reliable method of measuring the degrees of conversion during photopolymerization of dental fillings. Contrary to the methods used so far, the method is based only on comparison with the monomer absorbance spectrum without reference bands. Another aim of the study was to prepare a comparative analysis of the polymerization kinetics of dental resins under various light sources and different environmental conditions (irradiance, light dose, temperature), with estimation of the degrees of conversion (DC) of the resins being the main metric. HRi

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Popovic, Gorjana, and Roze Djokic. "Photopolymerization of dental materials: Types and characteristics of the light sources." Serbian Dental Journal 56, no. 4 (2009): 207–12. http://dx.doi.org/10.2298/sgs0904207p.

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Light from the polymerization source which initiates photopolymerization in the material has its determined wavelength. Photoinitiator, such as camphorhinone, excited by light, can be activated with any of the wavelength from its absorption spectrum. To obtain successful photopolymerization, light source should emit waves of adequate wavelength; light intensity has to be optimal, to have sufficient time of exposure and material up to 2 mm thickness. Photoinitiator inside the material should match light source spectrum and work regime. Halogen lamps have wide spectra of wavelengths in the visib

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20

Lobanov, Yevhenii, and Glib Petchenko. "Analysis of the transition of local lighting fixtures in Ukraine to Led-analogues based on a comprehensive study of their light distribution." Lighting Engineering & Power Engineering 61, no. 1 (2022): 1–9. http://dx.doi.org/10.33042/2079-424x.2022.61.1.01.

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The purpose of this work is to study the state of the problem of transition of local lighting fixtures in Ukraine to LED counterparts. At present, there is almost a complete abandonment of the use of traditional light sources, due to the low light output of these sources, low service life, environmental considerations, and so on. However, the main requirement for lighting fixtures of any type is the compliance of their light distribution with the visual tasks that will be assigned to them during operation. As for most outdoor and indoor lighting fixtures, they are, in fact, certified, and thei

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Ramírez Como, Magaly, Luis Resendiz, Osbel Almora Rodríguez, and Lluis F. Marsal. "(Invited) Non-Fullerene Acceptor in Organic Solar Cells Toward Improving Performance as Indoor Light Energy Harvester." ECS Meeting Abstracts MA2024-01, no. 31 (2024): 1530. http://dx.doi.org/10.1149/ma2024-01311530mtgabs.

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Research in organic solar cells aims to develop new materials that improve efficiency. The inception of emerging non-fullerene acceptors (NFAs) by replacing the fullerene counterpart in organic solar cells (OSCs) has pushed the bulk-heterojunction based photovoltaics to achieve efficiencies around 18% [1-6]. In order to produce efficient OSCs, it is required to have donor and acceptor materials with matching absorption bands in the Vis-NIR range, high charge-carrier mobility, and a small energy offset to minimize voltage losses. Mainly, the development of Y7 NFA molecule has improved power con

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Damodaran, Sruthi. "Double Integrated-Buck Boost Converter versus Double Integrated-Buck Topology for LED Lamps." Asian Journal of Electrical Sciences 8, S1 (2019): 19–24. http://dx.doi.org/10.51983/ajes-2019.8.s1.2314.

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In this paper a comparative study between two different approaches for LED driving based on the double integrated buck boost and a double integrated Buck converter. It presents a single-stage, single-switch, transformer less ac/dc converter suitable for Led lighting applications. High Brightness Light Emitting Diodes (HB LEDs) can be seriously considered for replacing conventional halogen, incandescent and fluorescent lamps in general illumination including streetlights due to the rapid development in LED technology in recent years. In many offline applications, maintaining a high-power factor

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Ogunmodede, I.A, and Aibangbee J.O. Dr. "Electrical Energy Audit for Muritala Muhammed International Airport, Lagos." International Journal of Innovative Science and Research Technology 6, no. 12 (2022): 1233–39. https://doi.org/10.5281/zenodo.6346851.

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The aim is to conduct an energy audit to know the energy consumption of Murtala Muhammed International Airport. It is discovered that the airport is made up of two components which are Airside and the Landside. The Airside comprises of Airfield lighting system in which the central runway and taxiway lighting system is made of Halogen fitting. Moreover the Landside component consist of the terminal building where all the lighting fittings installed are mostly fluorescent fittings and that of ground access includes external illumination are made halide, flood light and pressure intensity lamp ra

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Griffin, R. E. M. "Knowing What is Best." Proceedings of the International Astronomical Union 10, H16 (2012): 729. http://dx.doi.org/10.1017/s174392131401312x.

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AbstractAlready, and with good reason, light pollution is recognized as one of the most damaging legacies that current “civilization“ is bequeathing to its children. Denying them the opportunity, even the right, to experience visually the majesty and awe of the universe has obvious repercussions for our science, and other contributors to this meeting are addressing those eloquently. But it is also critically important to place light pollution in the cadre of the general environmental degradation which unbridled technology is causing. The amount of power consumed by one outdoor light is only a

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Bora, R., B. B. Maini, and A. Chakma. "Flow Visualization Studies of Solution Gas Drive Process in Heavy Oil Reservoirs Using a Glass Micromodel." SPE Reservoir Evaluation & Engineering 3, no. 03 (2000): 224–29. http://dx.doi.org/10.2118/64226-pa.

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Summary A series of flow visualization experiments was carried out to examine the pore scale behavior of the solution gas drive process in heavy oil reservoirs. The main objective was to testify several speculative theories that had been put forward to explain the anomalous production behavior of heavy oil reservoirs producing under the solution gas drive process. Contrary to previous postulations, the asphaltene constituents did not appear to play a significant role in the nucleation and stabilization of the gas bubbles that evolved during the solution gas drive process. Experimental evidence

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Nadya, Okta Biolita, Nurrahmawati Aminah, Oktaviani Rini, and Harmadi Dr. "Developement of Cholrella vulgaris Microalgae Photobioreactor System to Optimize the Production of Oxygen (O2) Concentration and to Mitigate the abundant Carbon Dioxide (CO2)." October 24, 2021. https://doi.org/10.5281/zenodo.6300077.

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Chlorella vulgaris Microalgae photobioreactor to optimize the production Oxygen (O2) concentration has been developed. The photobioreactor consisted of temperature control using LM35 Sensors, Oxygen concentration measuring device using SK-25F sensor and the Chlorella vulgaris photobioreactor itself which were integrated in a system. The Photobioreactor was illuminated by halogen lamp and Blue LED. Not only being illuminated by varying light source but it was also set in condition without light (0 lux), so the difference of Oxygen concentration that was produced in every light condition with di

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27

Echávarri-Dublhán, Jaione, Miriam Alonso-Santamaría, Paula Luri-Esplandiú, and María-José Sháiz-Abajo. "Comparison of different illumination systems for moisture prediction in cereal bars using hyperspectral imaging technology." Journal of Spectral Imaging, October 25, 2022. http://dx.doi.org/10.1255/jsi.2022.a10.

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Moisture content and its distribution is a critical parameter in the production of cereal bars. Inappropriate control of this quality parameter can lead to non-conforming products and excess waste on production lines. In the field of hyperspectral imaging, the search for alternative light sources to stabilised-halogen (cheaper and emitting less heat) is a growing need for the application of this technology in industry. This study compares three different illumination systems for moisture prediction in the visible-near infrared (vis-NIR) range (from 400 nm to 1000 nm). The hyperspectral images

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Bieske, Karin, Ulla Maria Hartwig, Christoph Schierz, Alexander Wilm та Carolin Horst. "TM-30–15 and CIE-CRI-Ra: Investigation of Сolour Rendering of White PC LEDs". Light & Engineering, квітень 2018, 81–87. http://dx.doi.org/10.33383/2018-006.

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The colour rendering properties of 21 phosphor converted LED light sources (pc LED) with different Rf and Rg values as in the Fidelity Index and Gamut Index of the TM30–15 have been investigated. Scenarios illuminated by pc LEDs, a fluorescent lamp (FL) and a tungsten halogen lamp (THL) were presented to 34 subjects. An assortment of coloured objects was arranged identically in two adjoining booths and participants rated the test scenarios in comparison with the reference illuminant (THL). For colour quality, both indexes are reflected in the observer’s ratings. The Fidelity Index strongly co

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Pirvulescu, Ioana Ligia. "Influence of Different Illuminants on Spectrophotometric Tooth Color Determination." Journal of Clinical and Medical Research, September 20, 2022. http://dx.doi.org/10.37191/mapsci-2582-4333-4(4)-117.

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Statement of problem: The vast majority of studies address the comparison of visual and instrumental tooth color determination. Although, the lighting conditions of the environment may affect the clinical shade matching performance. This study evaluated if and how different light sources can influence the spectrophotometric determination of natural tooth color. Purpose: The purpose of this study was to evaluate the precision of the spectrophotometer in tooth shade determination under the influence of different illuminants. Material and method: Three examiners, determined the shade of an upper

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Blanch-Pérez del Notario, Carolina, Carlos López-Molina, Andy Lambrechts, and Wouter Saeys. "Hyperspectral system trade-offs for illumination, hardware and analysis methods: a case study of seed mix ingredient discrimination." Journal of Spectral Imaging, December 7, 2020. http://dx.doi.org/10.1255/jsi.2020.a16.

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The discrimination power of a hyperspectral imaging system for image segmentation or object detection is determined by the illumination, the camera spatial–spectral resolution, and both the pre-processing and analysis methods used for image processing. In this study, we methodically reviewed the alternatives for each of those factors for a case study from the food industry to provide guidance in the construction and configuration of hyperspectral imaging systems in the visible near infrared range for food quality inspection. We investigated both halogen- and LED-based illuminations and conside

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Feng, Yating, Qi Wang, Ting Li, et al. "Benzodithiophene‐Thienothiadiazole Copolymers as Dopant‐Free Hole‐Transporting Layers Enabling Efficient and Stable Perovskite Solar Cells." Solar RRL, October 24, 2023. http://dx.doi.org/10.1002/solr.202300706.

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The exploration of dopant‐free hole‐transporting materials (HTM) with excellent optoelectronic properties and defect passivation ability is of great significance for simultaneously improving the efficiency and stability of perovskite solar cells (PSCs). Herein, two donor–acceptor (D–A) type conjugated polymers PTTDZ‐F and PTTDZ‐Cl with alternating benzodithiophene (BDT) and thienothiadiazole (TTD) units are successfully developed with desirable hole mobilities and conductivities. The formation of non‐covalent interaction (S···N) between thiophene bridge and TTD units significantly improved the

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Zeynep Uras, Umut, Mehmet Arık, and Enes Tamdoğan. "Thermal Performance of a Light Emitting Diode Light Engine for a Multipurpose Automotive Exterior Lighting System With Competing Board Technologies." Journal of Electronic Packaging 139, no. 2 (2017). http://dx.doi.org/10.1115/1.4036403.

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In recent years, light emitting diodes (LEDs) have become an attractive technology for general and automotive illumination systems replacing old-fashioned incandescent and halogen systems. LEDs are preferable for automobile lighting applications due to its numerous advantages such as low power consumption and precise optical control. Although these solid state lighting (SSL) products offer unique advantages, thermal management is one of the main issues due to severe ambient conditions and compact volume. Conventionally, tightly packaged double-sided FR4-based printed circuit boards (PCBs) are

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