• Title, Summary, Keyword: LED luminaire

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Effects of LED Lamps for Replacement of Metal Halide Lamp in Roadway Lighting Environment (LED램프와 메탈램프가 도로조명환경에 미치는 특성 비교평가)

  • Lee, Myung Gi;Kim, Jeong Tai
    • KIEAE Journal
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    • v.13 no.2
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    • pp.47-52
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    • 2013
  • The problems of light pollution first became an issue in the 1970s when astronomers identified the degradation of the night sky due to the increase in lighting associated with development and growth. As more impacts to the environment by lighting have been identified, many attempts have been made for reducing light pollutions. To prevent light pollution and increase energy efficiency, Seoul Metropolitan Government(SMG) replaced metal halide road lighting to LED luminaire in four arterial highway in Seoul. The present study compared the lighting characteristics of metal halide and LED luminaire in terms of Korea Standard for road lighting(KS A 3701) and BUG rating from Illuminating Engineering Society of North America(IESNA). The results showed that LED luminaire increased road surface luminance up to 2 times in average compared to the metal halide environment. Also, LED luminaire reduced the glare value by 2 times and luminous flux over 50% than the metal halide luminaire. In comparison with the BUG ratings, LED luminaire rated 1 degree lower for the backlight ratings and 3-4 degrees lower for the uplight ratings. The measured values testified that the LED luminaire is effective for roadway lighting and light pollution reduction.

Fabrication and Evaluation of a LED Luminaire for Submarine (잠수함용 LED 등기구의 제작과 평가)

  • Kim, Sun-Jae;Kim, Se-Jin;Kil, Gyung-Suk;An, Chang-Hwan;Song, Dong-Young
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.26 no.10
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    • pp.778-784
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    • 2013
  • In order to develop a LED luminaire for naval-submarines which can replace a conventional one with two-compact fluorescent lamp (CFL) of 18 W, we analyzed the electrical and optical performance of the conventional luminaire. A LED luminaire was fabricated as compact as possible based on the analyzed data. The weight of the prototype LED luminaire is 1.8 kg, reducing up to 58% of the conventional one. The use of LED package for the submarine luminaire could reduce the power consumption from 38 W to 14.5 W with the same optical performance. The reason is that the optical efficacy of the LED luminaire improved by 2.47 times as 61.9 lm/W, compared to 25.1 lm/W for the conventional one.

A Guideline on Development of LED Convergence Intrinsic Safety Luminaire for Marine Plants & Ships and It's Standard (선박 해양용 본질안전 LED 방폭 조명 표준화를 위한 가이드 개발 연구)

  • Lee, Seung-Hyeok;Kim, Tae-Hun
    • Journal of the Korea Safety Management & Science
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    • v.19 no.4
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    • pp.25-34
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    • 2017
  • Offshore plants should be managed at a high level of safety condition. Because the offshore plant has cramped space and has difficult access when a fire occurred, a fire can be critical to the plants. LED lighting can reduce the risk of fire by its lower energy consume suitable to intrinsic safety and lower heat radiation that can reduce the possibility of ignition. Also LED has a long lifetime. Though LED luminaire has various advantages for offshore plants, an international standard for the luminaire has not provided because it is new technology. Because there is no international and domestic standard specially provided for the LED luminaire, a guideline is required for developing the LED light and for the future establishment of an international standard. This study was conducted to develop the guideline for LED luminaire for offshore plants. Firstly, relevant standards were analyzed for the guideline. Then we found that there are editorial differences between international standards and domestic standards. So the guideline was developed based on international version and the differences between the domestic and international standard were provided to let Korean developers recognize the differences.

Analysis of Property for White and RGB Multichip LED Luminaire (백색 LED와 RGB 멀티칩 LED 조명장치의 특성 분석)

  • Jeong, Byeong-Ho;Kim, Nam-Oh;Kim, Deog-Goo;Oh, Geum-Gon;Cho, Geum-Bae;Lee, Kang-Yoen
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.23 no.12
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    • pp.23-30
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    • 2009
  • LEDs are increasingly used for many applications including automotive, aviation, display, transportation and special lighting applications. Generally, the RGB multichip LED luminaire applied to signboard, emotional lighting system and display device and the white LED luminaire applied to general lighting system. white LED spectra for general lighting should be designed for high luminous efficacy as well as good color rendering. This paper describes characteristics of LED luminaire white LED and RGB multichip LED. Two type of LED luminaire prototype used experiment physical, electrical and optic test and performance analyzed. RGB multi-chip and phosphor-type white LED luminaire were analyzed by experiment on their color characteristics and luminous efficacy of radiation, distribution curve, and electrical characteristics. Research work is in progress to develop an improved performance for optic and electrical works well for two type of LED luminaires.

A Design of an LED Sensor Luminaire for Visual Function Improvement (시각적 기능개선을 위한 LED 센서 등기구 설계)

  • Seo, Jung-Nam;Yu, Yong-Su;Yeo, In-Seon
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.59 no.1
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    • pp.134-137
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    • 2010
  • An LED sensor luminaire for visual function improvement necessitates the control algorithm for light level adjustment and the appropriate lens design. The control algorithm adapts to surround lighting condition, and thus has the advantages of energy saving and glare reduction. The multi-cell lens design improves color temperature uniformity and spatial light distribution of the luminaire. Experimental and simulated results show that this approach contributes noticeably to energy saving and color temperature uniformity of the LED sensor luminaire.

The Luminous Intensity and Luminaire Efficiency Analysis of White LED as Luminaire types for General Lighting (조명용 백색 LED광원의 등기구 형태에 따른 광도 및 기구효율 분석)

  • Hwang, Myung-Keun;Huh, Chang-Su;Seo, Yu-Jin
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.18 no.3
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    • pp.20-26
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    • 2004
  • In this paper, luminaire optical efficiency and luminous intensity according to array of HB(high brightness) white LED(light emitting diode) and globe types of luminaire were simulated by computer and made a comparative analysis. LEDs were arranged by square of 7ea X 7ea. LED space has been divided into 8.2mm, 10mm and 15mm that mean distances between luminous centers of LEDs, and luminaire globes were classified into 30mm and 50mm 묘묘 from luminous center of LEDs. Also the simulations were made with / without globe, globe types were specified by convex and embossing types of which sizes are 8.2mm and 5.0mm, So total 27 classes of simulation were performed. This paper is to help luminire development using LED light source called digital lighting of 21th century, by studying luminire effciency and luminous intensity of different types of globes.

Consideration of a LED Luminaire Standard for Naval Vessels (함정용 LED 조명기구의 표준화 방안)

  • Kim, Il-Kwon;Cho, Hyang-Eun;Kil, Gyung-Suk;Kwon, Hyuk-Sang;Cho, Heung-Gi
    • Proceedings of the Korean Society of Marine Engineers Conference
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    • pp.182-182
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    • 2011
  • This paper dealt with a design guide of LED luminaire standard for naval vessels. Several standards such as Korean Industrial Standard (KS), Korea Defence Standard (KDS) and US Military Standard (MIL) were compared in terms of safety and performance of lighting fixtures. The electrical and optical characteristics of the FL fixtures were experimentally analyzed to acquire design rules for LED luminaires. Based on the study results, we proposed the concept of a LED luminaire standard.

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Development of Wireless Control System for High Power LED Luminaire Using Bluetooth Wireless Communication and Current Control System (Bluetooth 무선 통신과 전류제어 시스템을 이용한 고전력 LED 등기구의 무선제어 시스템 개발)

  • Lee, Wan-Bum
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.17 no.3
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    • pp.66-72
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    • 2016
  • An LED lighting control system was developed to combine information technology and LED lights for efficient management and energy savings. The system can monitor and control the status of an LED luminaire using Bluetooth wireless communication, sensor technology, and smart phones. An LED lighting control circuit was designed using a temperature sensor, illumination sensor, and Bluetooth module with a fuzzy constant-current control circuit. We extended the lifetime and prevented damage to the LED by optimizing the supply current of the LED luminaire based on the heat-generation temperature of $70^{\circ}C$ of an LED heat sink. We also automatically adjusted the ON/OFF time depending on the ambient illumination of the LED luminaire. By allowing easy control of the LED luminaires on a smartphone, we improved the efficiency and achieved energy savings. The control system was validated through experiments for normal operation.

A Study for the Control of Various Luminous Intensity Distribution in Numerical Model of Planar Prism LED Luminaire (평면 프리즘 LED 조명기구 배광수치모델의 다양한 배광 제어를 위한 연구)

  • Kim, Yu-Sin;Choi, An-Seop
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.25 no.12
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    • pp.60-66
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    • 2011
  • There are several technological problems have to be resolved for LEDs to be used as a general purpose light source. In addition, there are several differences between existing luminaires and the general planer LED luminaire for the intensity distribution. Therefore, the optical engineer then faces the challenging a problem of designing for a spatially extended and non-uniform light source. In the previous studies on the optical design of luminaires, a lot of studies on reflectors and light source have been conducted but the ones on prisms and lenses are insufficient at present. This study developed the numerical model of planar prism LED luminaire to control luminous intensity distribution of LED luminaires. And this study presents an optical calculation process for the prism optical design of a planar prism LED luminaire and a comparison of the simulation results between the developed numerical model and Photopia 2.0 to verify the accuracy of the numerical model. In addition, this study showed a method for the control of various luminous intensity distribution from the developed numerical model.

Feasibility Analysis for Introducing ESCO Program of LED Luminaire Replacements in Schools

  • Shin, Hyunman;Jang, Woojin
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.30 no.1
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    • pp.8-13
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    • 2016
  • Public institutions should replace their luminaires with LED lighting by 2020 to save energy. Because the LED lighting installation rate in schools has not yet reached the legal goal, the ESCO program feasibility was investigated. The amount of electricity used, electric rates, times of use in classrooms and fluorescent lighting maintenance costs etc., as well as the elements of lighting maintenance were analyzed. In the case of schools, the lamp usage time was so short that the ESCO projects with only energy savings were impossible. In order to execute the ESCO projects, the maintenance cost savings by replacing an existing luminaire should be considered and the introduction of the relatively cheaper tube type LED lamp than the flat type LED luminaire was required.