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권민기 ( Min-ki Kwon ),방광수 ( Guang Zhu Fang ),정재훈 ( Jae Hoon Jung ),안재현 ( Jae Hyun Ahn ),김영심 ( Young-shim Kim ),정형식 ( Hyung-shik Jung ),박종락 ( Jong-rak Park ) 조선대학교 공학기술연구원 2016 공학기술논문지 Vol.9 No.4
In this paper, a 300 W LED projection lighting system for landscape lighting applications was designed and fabricated. Detailed descriptions of the system design were given. Optical and electrical characteristics of the fabricated system, including total luminous flux, luminous efficacy, electric power consumption, and viewing angle, were measured. Future plans for utilizing and commercializing the developed system were presented.
정재훈 ( Jae Hoon Jung ),권민기 ( Min-ki Kwon ),방광수 ( Guang Zhu Fang ),김승은 ( Seung-eun Kim ),박종락 ( Jong-rak Park ),김영심 ( Youngshim Kim ),정형식 ( Hyung-shik Jung ) 조선대학교 공학기술연구원 2019 공학기술논문지 Vol.12 No.4
In this paper, an 800 W high-power, full-color LED projection lighting system was designed and fabricated for landscape lighting applications. The system has 16×16 full color RBG LED arrays and four channel microprocessors to control the color of each pixel. To collimate the light of an 800 W high-power LED projection lighting system, 395×395 mm Fresnel lens was embedded in the system housing without condenser lens. In addition, the structure of the system was designed to provide heat dissipation and waterproof functions. The lighting system could project various images consisting of dots, lines, planes, characters, and pictures at a distance of 5 and 10 m. Total luminous flux, electric power consumption, and luminous efficacy were measured to be 20692 lm, 874.8 W, and 23.7 lm/W, respectively.
김승은 ( Seung-eun Kim ),방광수 ( Guang Zhu Fang ),정재훈 ( Jae Hoon Jung ),안재현 ( Jae Hyun Ahn ),주기남 ( Ki-nam Joo ),권민기 ( Min-ki Kwon ),박종락 ( Jong-rak Park ) 조선대학교 공학기술연구원 2017 공학기술논문지 Vol.10 No.2
Optical modeling and simulations of a recently developed light-emitting diode projection system for landscape lighting applications were performed. A commercially available illumination design software, LightTools, was employed to this end. Various imaging patterns available from the projection system were simulated and the simulated results were found to be in good agreement with measured ones.
김자연 ( Ja-yeon Kim ),조유현 ( Yu-hyun Cho ),박현선 ( Hyun-sun Park ),김두형 ( Doo-hyung Kim ),김민우 ( Min-woo Kim ),박종락 ( Jong-rak Park ),권민기 ( Min-ki Kwon ) 조선대학교 공학기술연구원 2016 공학기술논문지 Vol.9 No.2
GaN based LEDs have gradually replaced traditional light sources in various applications including backlight display units, traffic signals, automotive lighting, architectural lighting, and general lighting. However, improvements to the external quantum efficiency (EQE) are required for these various application. The EQE of LED is correlated to the internal quantum efficiency (IQE) and the light extraction efficiency (LEE). Although the IQE of GaN-based LEDs has reached more than 80% due to the rapid development of growth techniques for high-quality epi-layers, the LEE of the LEDs is still low because of the large refractive index difference between the GaN (nGaN=2.5) and air (nair=1). Herein, various polygon shaped(triangle, parallelogram, pentagon, hexagon, circle shaped) LEDs are compared with those of a traditional quadrangular LED to enhance LEE of LED. To estimate the enhancement of LEE, we simulated the various shaped LEDs with ray-trace simulation tools. In addition, to measure the total amount of photons emitted from LEDs in all directions, the various polygon LEDs were encapsulated and packaged with To-can. Their optical output power of polygonal shaped LED is significantly improved, compared to that of traditional quadrangular LED due to increase in LEE along to lateral direction.