• Title/Summary/Keyword: Efficiency of lighting

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A David Star Magic Square Algorithm for Efficient LED Control (효율적인 LED 제어를 위한 다윗 스타 마방진 알고리즘)

  • Lee, Kyung-Min;Lin, Chi-Ho
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.16 no.3
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    • pp.109-113
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    • 2016
  • In this paper, we propose efficient LED lighting control algorithm using a David star magic square. Such algorithms increases the power reduction, the heat efficiency and LED life cycle and the efficiency of the LED lighting control consumption. Lighting system using existing Magic square algorithm could be reduced to increase the heat efficiency of the LED because the LED lighting time of the reduced cross-lighting. but it has a limit to the lighting control. If should apply the this proposed algorithm, can reduces power consumption and increases LED life-cycle, heat efficiency of LED lighting module and efficiency of the lighting control of the LED. This paper proposed that algorithm is by using a David star magic square on the LED Matrix. Divided into twelve areas to move the pattern in constant time interval, to perform the cross rotation and inversion techniques to thereby light up. In this paper proposed algorithm of this paper was compared with existing Magic square approach. As a result, power consumption and heat-value and luminous flux was reduced as the conventional lighting system. And, the LED lighting control increase the efficiency.

The Comparison of the Economical Efficiency of Light Sources for a Tunnel Lighting (터널조명용 광원의 경제성 비교)

  • Yi, Chin-Woo
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.25 no.2
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    • pp.32-42
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    • 2011
  • In this paper to compare the economical efficiency of light sources for a tunnel lighting, we define a model tunnel and design tunnel lighting. And to examine economical efficiency of various tunnel lightings we compare the lighting expenses of tunnels. The results shows high pressure sodium lamps are more economical than fluorescent lamps.

A Reconfigurable Lighting Engine for Mobile GPU Shaders

  • Ahn, Jonghun;Choi, Seongrim;Nam, Byeong-Gyu
    • JSTS:Journal of Semiconductor Technology and Science
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    • v.15 no.1
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    • pp.145-149
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    • 2015
  • A reconfigurable lighting engine for widely used lighting models is proposed for low-power GPU shaders. Conventionally, lighting operations that involve many complex arithmetic operations were calculated by the shader programs on the GPU, which led to a significant energy overhead. In this letter, we propose a lighting engine to improve the energy-efficiency by supporting the widely used advanced lighting models in hardware. It supports the Blinn-Phong, Oren-Nayar, and Cook-Torrance models, by exploiting the logarithmic arithmetic and optimizing the trigonometric function evaluations for the energy-efficiency. Experimental results demonstrate 12.7%, 42.5%, and 35.5% reductions in terms of power-delay product from the shader program implementations for each lighting model. Moreover, our work shows 10.1% higher energy-efficiency for the Blinn-Phong model compared to the prior art.

Effect of Lighting Saving Using High Efficiency Reflector (고효율 반사갓을 이용한 등기구 저감효과)

  • Cho, Huyn-Kyung;Kim, Jae-Chul;Jung, Seung-Bock;Im, Sang-Kug
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • 2006.05a
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    • pp.148-153
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    • 2006
  • This paper analyzes the effect of the energy saving and evaluates the economics using High Efficiency lighting. About 18 percent (17,000GWh) of total power demands in Korea m consumed i]l the lighting field. There isa lot of energy potential that can be saved because the power demand isolwer relatively than the others parts. The existing lighting that its length and electric energy are 32[mm] and 40[w] can alternate with high efficiency lighting which its length and electric energy are 26[mm] and 32[w]. Two Lightings is measuring the illumination and the electric energy and then are analyzed into the effect of the lighting saving by measurement.

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The Nutrients Removal in Aerobic High Rate Ponds Through the Lighting Period (빛의 조사기간으로 본 호기성 고율 안정조 프로세스의 영양물질 제거)

  • 공석기
    • Journal of environmental and Sanitary engineering
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    • v.11 no.1
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    • pp.83-91
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    • 1996
  • It is not too much to say that the territorial inhabitants' concerns are wholly c concentrated on the environmental preservation-problem and development-problem in Korea given effect to the local self-government system. At a time like this I was studied the effect on nutrients removal through lighting period in aerobic high rate pond and we know that waste stabilization pond method is the most economical and energy saving wastewater treatment technology than others. At the results which was studied through operating the reactor-l artifically main-tained at a temperature, $25^{\circ}C$, a light intensity, 3000lux, and a lighting period, 24hrs and the reactor-2 artifically maintained at a tern야rature, $25^{\circ}C$ and a light intensity 3000lux, and a lighting period period, 12hrs, It has appeared for 24hrs.-lighting period -reactor-1 to be prior to the reactor-2. The attained results are that 1. reactor-1 is prior to reactor-2 on oxygen-generation 2. reactor-1 is prior to reactor-2 on algal production 3. COD removal efficiency, 90.76%, T-N removal efficiency, 80%, T-P removal e efficiency, 74.47 % in reactor-2, in reactor-1 COD removal efficiency, 94.85 %, T-N removal efficiency, 98.07%, T-P removal efficiency, 72.13% are, so the treatment efficiency of reactor-1 is more excellent than things of reactor-2 4. it appeared that the detention time is 8, 9days.

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A Study on the Efficiency of LED Lighting Applied by Direct AC Power Using Magnetic Resonance Wireless Power Transfer System (자계 공진 방식의 무선전력전송 장치를 이용한 교류 전력 직접 인가에 의한 LED 조명기기 효율에 관한 연구)

  • Park, Jeong-Heum
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.27 no.10
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    • pp.15-20
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    • 2013
  • In this paper, wireless power transfer system using the magnetic resonance was designed and applied to LED lighting for implementation of wireless lighting. This lighting was made by the converted DC driving type and the direct AC driving type. In the former, transferred AC power was rectified into DC and regulated to the specified voltage value, which leads to produce the loss at the rectifying and regulating circuit. In the latter, wireless-transferred AC power was directly applied to LED, which get rid of the loss derived from the additional circuit. For the efficiency-comparison between the former and the latter, the power at each stage was measured when the same optical output radiated from LED lighting part. The result revealed that the direct AC driving type had 18% higher efficiency than the DC driving type and confirmed that LED lighting using magnetic resonance wireless power transfer system can be efficient by direct AC power supply. And the direct AC driving type had the simple circuit structure and the simple LED lighting formation, so this can leads to various application.

Influence of Glass Tube Diameter in the Cold Cathode Fluorescent Lamps for 40-inch LCD-TVs

  • Lee, Min-Kyu;Lee, Kyoung-Ho;Han, Kyu-Hyeon;Lee, Jae-Wook
    • 한국정보디스플레이학회:학술대회논문집
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    • 2009.10a
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    • pp.707-710
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    • 2009
  • As the inner diameter of CCFL is increased in the range of outer diameters 3~5 mm, the luminance efficiency is increased by the low power consumption. For the outer diameter 5 mm, the efficiency is linearly increased even at the range of a high current.

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A Design of LED Lighting Controller for use of Solar Battery (태양전지 이용을 위한 LED 조명 제어기 설계)

  • Kim, Byun-Gon;Lee, Ok-Jae
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.25 no.6
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    • pp.18-27
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    • 2011
  • LED lighting because of high efficiency, long life, friendly environment, as a general lighting of the next generation, has been substituted for incandescent bulb and fluorescent lamp. The proposed system for use of solar battery is the intelligent controller for LED street lights which is improved the method of battery charging and charging efficiency in winter to extend battery life cycle, controlled lighting current according to SoC and in steps. Also, it is implemented emotional lighting which is controlled with the surrounding environment, by using colorful sub LED to take up 10[%] of a source of total light, white LED. As a lab results, the proposed system was implemented functions to adapt to the environmental changes, and improved the charging efficiency and battery life cycle.

A Study on Energy Savings Analysis by Controling LED Lighting according to the Change of the Amount of Daylight (주광량의 변화에 따른 LED조명 제어를 통한 에너지 절감량 분석에 관한 연구)

  • Ham, Won-Tae;Chae, Soo-Yong;Han, Soo-Bin;Kim, Heung-Geun;Jung, Hak-Guen
    • 한국태양에너지학회:학술대회논문집
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    • 2012.03a
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    • pp.522-528
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    • 2012
  • Currently, the energy consumption of electric lighting in an office building is accounted for more than 30% of the total energy consumption. In order to reduce the energy consumed by the indoor lighting, the daylight as a natural energy resource can play an important role in energy savings. The daylight can have positive impacts on improvement of work efficiency and productivity, and also make people feel more psychologically stable. Moreover, by using the daylight, we can definitely reduce the energy consumption in office buildings. Thus, the purpose of this study is to determine the LED dimming ratio depending on the ratio by calculating the amount of artificial illumination required according to the change of daylight by using the light simulation software that can quantify and visualize the performance of daylight. As a result, the energy savings could be obtained up to 30%.

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Economic Evaluation of LED Luminaires for Tunnel Interior Zones

  • Cho, Sook-Hyun;Kim, Hoon
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.27 no.11
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    • pp.7-13
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    • 2013
  • There has been a need for the systematic evaluation of the economic efficiency between conventional fluorescent lamp lighting systems that have been used in tunnels and LED lighting systems. This study has evaluated basic tunnel lighting between the conventional fluorescent lighting systems and the LED lighting system using the evaluation tool of tunnel lighting by Life Cycle Cost (LCC) and using the economic efficiency evaluation method. In addition, the unit discount rate of the LED lighting system and the estimated increase in the price of electricity have made the estimated cost of LCC the same if two luminaires were used in the basic part of the tunnel.