• Title, Summary, Keyword: Spectral Power Distribution(SPD)

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Energy consumption by Spectral Power Distribution Of LED lighting (LED 조명의 분광 분포에 따른 건물에너지 소비)

  • Jung, Ho-Youn;Kim, Hyo-In;Kim, Gon;Yun, Geun-Young
    • KIEAE Journal
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    • v.12 no.3
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    • pp.101-106
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    • 2012
  • Lighting energy accounts for approximately 20% of the electrical energy used worldwide. Thus, High efficiency Light emitting diode(LED)lighting is getting more popular as the next generation lighting replaced to traditional lighting fixtures. Also, LED lighting not only has a long lifetime but also can realize a variety visual environments through the wavelengh control. The lighting energy varies depending on the Spectral Power Distribution(SPD) even though the Illuminance level is same. Therefore, This study indicates that the difference of indoor energy consumption under the same illuminance level when Spectral Power Distribution(SPD) is different. As a result, Lighting energy consumption under red-color emphasizing SPD is about 10% lower than under blue-color emphasizing SPDs.

Melatonin Suppression under LED Lighting Focused on Spectral Power Distribution Differences

  • Hong, Seong-Kwan;Kim, Kyoung-Sil;Kim, In-Tae;Choi, An-Seop
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.29 no.8
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    • pp.7-17
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    • 2015
  • Changes in melatonin concentration levels by differences in CCT of white LED light focused on Spectral Power Distribution (SPD) differences compared to the same CCT of conventional fluorescent light were analyzed. For this, melatonin concentration levels in saliva samples were taken over four different experiments at seven-day intervals. In 71.4% of participants, it was confirmed that melatonin concentration is suppressed by exposure to light, and a slight difference was observed by different CCTs. In addition, Experiment II with a high CCT was relatively high in terms of the melatonin suppression rate compared to Experiment III. A key finding was the possibility that different SPDs under a particular CCT of white LED light compared to the same CCT of conventional fluorescent light could have the same effect on the melatonin suppression.

Research on Development of a dynamic LED lighting system (동적 LED 조명 시스템의 개발에 대한 연구)

  • Choi, Jong-Dae;Kim, Hyo-In;Yun, Geun-Young
    • 한국태양에너지학회:학술대회논문집
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    • pp.168-173
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    • 2011
  • Recently, from a saving energy and environmental lighting sources point of view, using LED lighting have been increased rapidly. The colors of light was applied to the control of dimmers that is composed of red, green, blue, and white(RGBW) to improve the quality of visual environment. Moreover this study has been processed to develop adjustable dynamic LED lighting system on SPD and definitize the various spectral power distribution and color temperature of light through the control of the four dimmers. It is possible to combine up to $432^4$ kinds of light. Measurement of illuminance of range on working surface was as 7~l,831 lux. Application of visual environment for occupants can be expected according to control of lighting performance.

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Production of Low-illuminated Image Sets based on Spectral Data for Color Constancy Research (색 항등성을 위한 분광 데이터 기반의 저조도 영상 집합 생성)

  • Kim, Dal-Hyoun;Lee, Woo-Ram;Hwang, Dong-Guk;Jun, Byoung-Min
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.12 no.7
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    • pp.3207-3213
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    • 2011
  • Most methods of color constancy, which is the ability to determine the object color regardless of the scene illuminant, have failed to meet our expectation of their performance especially about low-illuminated scenes. Some methods with high performance need to be developed, but we must, above all else, obtain experimental images for analyzing the required circumstances or evaluating the methods. Therefore, the paper produces new sets of images so that they can be used in the development of color constancy methods suitable for low-illuminated scenes. These sets are composed of two parts: one part of images which are synthesized with spectral power distribution(SPD) of illuminants, spectral reflectance curve of reflectances, and sensor response functions of camera; the other part of images where the intensity of each image is adjusted at the uniform rate. In an experiment, the use of the sets takes an advantage that its result images are analyzed and evaluated quantitatively as their ground truth data are known in advance.

Color matching of color CRT and dyed fabric by using experimental method (실험실적 방법에 의한 Color CRT와 염색직물의 칼라 매칭)

  • 김청섭;홍영기;배기서
    • Textile Coloration and Finishing
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    • v.13 no.6
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    • pp.397-404
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    • 2001
  • The accurate representation of the colors of dyed fabric on a color CRT(cathode ray tube) screen is the basis for the automatic process in dyeing industry. In the former study, we had focused on the theoretically color matching method between CIE(International Commission on illumination) and RGB color coordinates, but In this study we tried simulating the colors obtained from fabrics on the color CRT by using experimental method. we obtained the following results. 1. We could simulate all of the color CRT by gamut mapping method, even though some of the KOSCOTE(Korea Standard Color of Textile) colors represented on the color CRT didn't exist in the region of color region 2. We could do conditional matching by CIE system, even though it was hard to do invariant matching the Red, Green, Blue phosphors of the color CRT because of the SPD(Spectral Power Distribution) which had been set up before. 3. We could simulate all the colors obtained from fabrics on the color CRT by matching those two color groups from KOSCOTE fabrics and color CRT using match algorithm and matching programs. 4. If we get over on obstacles by grafting CCM and CCK machines which have been used in educational and industrial areas by matching KOSCOTE with color CRT we will be able to invent color simulation system controled automatically.

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