High-power LED light sources for optical measurement systems operated in continuous and overdriven pulsed modes

Author(s):  
Bolesław Stasicki ◽  
Andreas Schröder ◽  
Fritz Boden ◽  
Krzysztof Ludwikowski
2021 ◽  
Vol 11 (9) ◽  
pp. 4035
Author(s):  
Jinsheon Kim ◽  
Jeungmo Kang ◽  
Woojin Jang

In the case of light-emitting diode (LED) seaport luminaires, they should be designed in consideration of glare, average illuminance, and overall uniformity. Although it is possible to implement light distribution through auxiliary devices such as reflectors, it means increasing the weight and size of the luminaire, which reduces the feasibility. Considering the special environment of seaport luminaires, which are installed at a height of 30 m or more, it is necessary to reduce the weight of the device, facilitate replacement, and secure a light source with a long life. In this paper, an optimized lens design was investigated to provide uniform light distribution to meet the requirement in the seaport lighting application. Four types of lens were designed and fabricated to verify the uniform light distribution requirement for the seaport lighting application. Using numerical analysis, we optimized the lens that provides the required minimum overall uniformity for the seaport lighting application. A theoretical analysis for the heatsink structure and shape were conducted to reduce the heat from the high-power LED light sources up to 250 W. As a result of these analyses on the heat dissipation characteristics of the high-power LED light source used in the LED seaport luminaire, the heatsink with hexagonal-shape fins shows the best heat dissipation effect. Finally, a prototype LED seaport luminaire with an optimized lens and heat sink was fabricated and tested in a real seaport environment. The light distribution characteristics of this prototype LED seaport luminaire were compared with a commercial high-pressure sodium luminaire and metal halide luminaire.


2019 ◽  
Vol 12 ◽  
pp. 361-367 ◽  
Author(s):  
Hongwei Liu ◽  
Dandan Yu ◽  
Pingjuan Niu ◽  
Zanyun Zhang ◽  
Kai Guo ◽  
...  

2018 ◽  
Vol 972 ◽  
pp. 012009
Author(s):  
Evgeniy Ivashin ◽  
Sergey Ogarev ◽  
Boris Khlevnoy ◽  
Stanislav Shirokov ◽  
Dmitry Dobroserdov ◽  
...  

2008 ◽  
Author(s):  
C. Sommer ◽  
F. P. Wenzl ◽  
L. Kuna ◽  
E. Zinterl ◽  
J. R. Krenn ◽  
...  

2020 ◽  
Vol 2 (3) ◽  
pp. 192
Author(s):  
Hikmatul Amri ◽  
Stephan Stephan

Salah satu peralatan elektronika yang paling banyak digunakan oleh masyarakat adalah lampu penerangan. Lampu penerangan rumah dan bangunan memngalami perkembangan yang cukup mulai dari lampu bohlam atau pijar, lampu fluorescent/TL, lampu halogen, lampu LED. Lampu LED sampai saat ini telah mengalami perkembangan LED dual inline package (DIP), LED surface mount device (SMD), HPL (high power LED), dan COB (chip on board). Rangkaian elektronika pada lampu jenis LED hanya terdiri dari 2 bagian yaitu: rangkaian driver dan rangkaian LED yang disusun secara seri. Kerusakan lampu LED paling banyak terjadi pada rangkaian driver dimana ada kerusakan paling ringan yaitu ada komponen yang terbakar sampai kerusakan terparah yaitu seluruh rangkaian yang terbakar. Metoda yang dilaksanakan adalah dengan memberikan pelatihan perbaikan/reparasi lampu jenis LED bagi usaha perbaikan/service peralatan elektronika yang dikelola oleh pemuda RT.05/RW.03 Desa Buruk Bakul. Tahapan yang dilaksanakan adalah memberikan materi komponen yang ada pada lampu LED, memberikan materi tentang komponen yang paling sering terjadi kerusakan pada lampu LED, memberikan praktik cara penggunaan alat ukur analog dan digital, memberikan praktik cara mengecek bagian yang rusak, praktik cara mengganti komponen yang rusa dan tahap melakukan finishing dengan menguji coba terhadap lampu LED yang sudah diperbaiki. Target service ini adalah lampu LED yang ada di sekitar Desa Buruk Bakul dan desa lain yang ingin memperbaiki lampu LED terutama dengan daya yang besar (15-45 watt) karena harga belinya cukup mahal. Dengan mengimplementasikan usaha ini langsung kepada masyarakat maka akan membutuhkan 7-7 orang tenaga kerja, sehingga mampu menambah penghasilan khususnya pada masyarakat kelas bawah di RT.05/RW. 03 Desa Buruk Bakul. One of the main electronics used by the public are light bulbs used for lighting. Household and building lighting has undergone an evolution through the times, starting from light bulbs, fluorescent lamps, halogen lamps, and finally LED lights. The development of LED lights created LED with dual inline package (DIP), LED surface mount device (SMD), HPL (high power LED), and COB (chip on board). The electronical network of LED lights consists of 2 parts, namely the driver network and the LED network that are arranged in a series. LED lights usually breakdown due to damage in the driver network. The lightest damage usually involves fire damage to its components and the heaviest damage usually involves fire damage to the whole network. The methods used involve giving LED lights reparations training to electronics repair stores that are run by youths in RT.05/RW.03 Buruk Bakul Village. The training consists of giving materials regarding components in an LED light, the most vurnurable components in an LED light, practice in the use of analog and digital gauges, practice in the process of checking for damages, practice in substituting damaged parts, and the finishing step of testing the repaired LED unit. The main target of these repairs are the LEDs that are in Buruk Bakul Village and other surounding villages that need LED repairs, especially LEDs with large wattage (15-45 watt) due to their fairly high prices. With the direct implementation of our program, we need 7 workers, in order to increase the income, especially for the lower class of RT.05/RW.03 Buruk Bakul Village.


2011 ◽  
Vol 301-303 ◽  
pp. 223-228
Author(s):  
Tie Cheng Gao ◽  
Yan Jin Ai ◽  
Xiu Yan Li

Aiming to the application of high-power LEDs in road lights, this article discusses the requirements of optical properties of LED road lights. It carries out the reflector-based secondary optical design of the selected LEDs, which is simulated with ASAP. The results show that this design can take full advantage of the optical properties of LED light sources, greatly improve the efficiency of LED road lights, and improve the uniformity of road lighting, so as to achieve the effects with which those effects produced from the traditional lights cannot be compared.


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