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Study of Optimized Reflector Design for Road Light Using Ray-Tracing Method  

Choi, Dae-Seub (서일대학 전기전자공학과)
Han, Jeong-Min (서일대학 전기공학과)
Shim, Yong-Sik (태영 E&C 기계전기팀)
Jeong, Chan-Oong (서울시청 도로관리담당관 기전관리팀)
Oh, Seon (서일대학 자동차과)
Publication Information
The Transactions of the Korean Institute of Electrical Engineers P / v.58, no.3, 2009 , pp. 347-350 More about this Journal
Abstract
In this study, it was studied about the improved road light design for drivers and pedestrians using forward or reverse ray-tracing method. Many of conventional road lights are not suitable for drivers and pedestrians because it has some serious problems such as glare effect or randomicity of illuminated areas. It was oriented from customary design method which was pointed at simple target such as luminance or electrical power. But it was not truth any more that the high luminance or electrical power consumption mean more bright and good road light. We studied ray-tracing method for road light reflector design to get the several goals. It means that good road light has easy for drivers and pedestrians eyes and illuminating objects on the road clearly. So, we set the design targets such as uniformity on the road area per one road light, shading angles and continuous luminance uniformity on the long distance road. We designed ideal road light conditions using ray-tracing method. We set the height of drivers and pedestrians eyes and calculated design guideline to make above design targets. Then we designed road light reflector using reverse ray-tracing method. And we achieved same luminance on the road almost half power consumption because we reduced loss of light. We achieved ideal design guide as 75 degrees of shading angles and 0.5 of luminance uniformity on the road area. It is superior than conventional road light ability such as 0.35 of luminance uniformity of 400 watts power consumption lamp. Finally, we suggested reflector design for 250 watts power consumption CDM Iight source.
Keywords
Road Light; Ray-Tracing Method; Shading Angles; Luminance Uniformity;
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