Research on Luminance Distributions of Chip-On-Board Light-Emitting Diodes

Czyżewski, Dariusz

doi:10.3390/cryst9120645

Cited by 14 publications

(10 citation statements)

References 35 publications

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“…The research proves [20] that all luminaires with several hundred times of luminous intensity amplification use high-luminance light sources. The luminance values of discharge lamps and LED light sources are within the range of 15 × 10 6 -100× 10 6 cd/m 2 [21,22]. Such luminance levels may already be dangerous for human eyes, especially when looking towards any luminaires or projectors.…”

Section: Object Identification and Dynamic Lighting In Lighting Technologymentioning

confidence: 99%

Dynamic Autonomous Identification and Intelligent Lighting of Moving Objects with Discomfort Glare Limitation

Słomiński

Sobaszek

2021

Energies

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The importance of reducing discomfort glare during the dynamic development of high luminance LEDs is growing fast. Smart control systems also offer great opportunities to reduce electricity consumption for lighting purposes. Currently, dynamic “intelligent” lighting systems are a rapidly developing field. These systems, consisting of cameras and lighting units, such as moving heads or multimedia projectors, are powerful tools that provide a lot of opportunities. The aim of this research is to demonstrate the possibilities of using the projection light in dynamic lighting systems that enable the reduction of discomfort glare and the light pollution phenomenon. The proposed system allows darkening or reducing the luminance of some sensitive zones, such as the eyes or the head, in real-time. This paper explores the development of the markerless object tracking system. The precise identification of the position and geometry of objects and the human figure is used for dynamic lighting and mapping with any graphic content. Time measurements for downloading the depth maps, as well as for identifying the human body’s position and pose, have been performed. The analyses of the image transformation times have been carried out in relation to the resolution of the images displayed by the projector. The total computation time related to object detection and image display translates directly into the precision of fitting the projection image to a moving object and has been shown.

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Section: Object Identification and Dynamic Lighting In Lighting Technologymentioning

confidence: 99%

Dynamic Autonomous Identification and Intelligent Lighting of Moving Objects with Discomfort Glare Limitation

Słomiński

Sobaszek

2021

Energies

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“…Literatürde power LED'li yol aydınlatma armatürlerine ilişkin lens tasarımı ve analizine yönelik oldukça fazla çalışma bulunmaktadır [33][34][35][36]. Ancak COB LED'li yol aydınlatma armatürlerinin optik tasarımına yönelik çalışmaların ise literatürde son yıllarda yer almaya başladığı görülmektedir [37][38][39]. Ayrıca konu ile ilgili yapılan literatür taramasında M1 ve M2 aydınlatma sınıfı yollar için COB LED'li yol aydınlatma armatürlerinin optik tasarımına yönelik çalışmaya rastlanmamıştır.…”

Section: Giriş (Introduction)unclassified

M1 ve M2 aydınlatma sınıfı yollar için geliştirilen bir COB LED’li yol aydınlatma armatür modelinin optik tasarımı

ÜNLÜ>

Şahi̇n

2023

Gazi Üniversitesi Mühendislik Mimarlık Fakültesi Dergisi

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Geleneksel yol aydınlatma teknolojileriyle karşılaştırıldığında, ışık yayan diyotlu (LED’li) yol aydınlatma armatürleri; yüksek enerji verimliliği, daha uzun çalışma ömrü ve daha iyi ışık dağılımı gibi potansiyel avantajlara sahiptir. Bu çalışmada M1 ve M2 aydınlatma sınıfı yollar için uygun bir COB LED (Chip on Board)’li yol aydınlatma armatür modelinin optik tasarımı ve analizi gerçekleştirilmiştir. Tasarım aşamasında, ışık kaynağı olarak Cree-XLamp-CXA1830 LED tercih edilmiştir. Seçilen COB LED ile uyumlu konkav-konveks küresel lensin 3D katı modeli, Zemax optik tasarım yazılımı vasıtasıyla modellenerek simüle edilmiş ve SolidWorks 3D tasarım yazılımında oluşturulmuştur. COB LED ve lens mesafesi Monte Carlo ışın izleme yöntemi (Monte Carlo Ray-Tracing Method) ile LightTools aydınlatma tasarımı yazılımı kullanılarak optimize edilmiştir. LightTools yazılımı vasıtasıyla, COB LED modülleri ve 20 modüllü COB LED’li armatür modelleri için simülasyon çalışmaları gerçekleştirilerek, ışık dağılım eğrileri ve fotometrik veri dosyaları (IES, LDT) elde edilmiştir. Elde edilen fotometrik veri dosyaları kullanılarak, DIALux aydınlatma hesap ve simülasyon yazılımı vasıtasıyla, M1 ve M2 sınıfı yol şartları için aydınlatma analizi gerçekleştirilmiştir. DIALux analizinden elde edilen yol aydınlatma parametreleri Uluslar Arası Aydınlatma Örgütünün (CIE) kabul ettiği yol aydınlatma kriterleri ile karşılaştırılarak armatür modellerinin uygunluğu değerlendirilmiştir. Bu çalışmada tasarımı yapılan COB LED’li armatür modelinin CIE tarafından tanımlanan M1 ve M2 sınıfı yol aydınlatma kriterlerini sağladığı görülmüştür. Çalışmada ayrıca, M1 ve M2 yol aydınlatma sınıfı kriterlerine uygun COB LED’li, özgün ve yüksek verimli bir armatür modelinin optik tasarım aşaması başarıyla tamamlanmıştır.

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“…However, very few papers focus on luminance distributions on the surface of light sources and luminaires [61][62][63][64][65], and yet, in the case of light sources, luminance measurements make it possible to determine the luminance distribution on the light-emitting surface. These are the basic tests necessary to design luminaires correctly.…”

Section: Introductionmentioning

confidence: 99%

The Photometric Test Distance in Luminance Measurement of Light-Emitting Diodes in Road Lighting

Czyżewski

2023

Energies

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Over the last few years, light-emitting diodes have completely dominated the lighting field. In road lighting, high-power LEDs have replaced traditional light sources. That is why various technical aspects of LEDs have been researched extensively worldwide. However, little research has been conducted in the area of luminance measurement. This paper reviews the methods for measuring the luminance of high-power LEDs. Particular attention is paid to the influence of the measurement distance on the measurement results. Next, the results of the tests using a modern image luminance measuring device (ILMD) for luminance measurements are presented. It is concluded that it is necessary to redefine the photometric test distance. The conducted research demonstrates that an incorrectly selected test distance can lead to the huge errors of several hundred per cent or more. In addition, the possible impact of the incorrect measurements on the design of road lighting installations is presented. It is shown that a road lighting installation can use over 300% more electrical energy compared to the installation based on the correct luminance measurements of single LEDs. In the final stage of the research, the definition of the photometric test distance for LED measurements using ILMD is proposed. The results of the research can also be useful for the luminance measurements of other types of LEDs.

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Research on Luminance Distributions of Chip-On-Board Light-Emitting Diodes

Cited by 14 publications

References 35 publications

Dynamic Autonomous Identification and Intelligent Lighting of Moving Objects with Discomfort Glare Limitation

Dynamic Autonomous Identification and Intelligent Lighting of Moving Objects with Discomfort Glare Limitation

M1 ve M2 aydınlatma sınıfı yollar için geliştirilen bir COB LED’li yol aydınlatma armatür modelinin optik tasarımı

The Photometric Test Distance in Luminance Measurement of Light-Emitting Diodes in Road Lighting

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