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http://dx.doi.org/10.7855/IJHE.2011.13.4.231

The Study on the optimized LED module of VMS for saving energy  

Kim, Young-Rok (한국건설기술연구원 도로연구실)
Lee, Suk-Ki (한국건설기술연구원 도로연구실)
Publication Information
International Journal of Highway Engineering / v.13, no.4, 2011 , pp. 231-238 More about this Journal
Abstract
Variable message signs(VMS) in use are being displaying with the LED device as the luminous source, and it is a recent trend to be changed from the Lamp type to the Surface-Mount Devices(SMD) type. The LED device leads to get VMS display brightly and clearly, leading to have visibility and legibility better than the existing VMS. However, the lights which display off the road, the unnecessary energy, might have negative effect on ecosystem. This study developed the way of getting the lights be displayed only to drivers without the unnecessary energy and estimated the energy efficiency of the development by the optical testing. As a result, this study showed that the energy consumption of the developed display device appeared to decrease by about 36.1% compared to the existing device. Also the upward and downward angle of the lights changed from an angle of $24^{\circ}C$ to $0^{\circ}C$and from an angle of $-24^{\circ}C$ to $-11^{\circ}C$, respectively. Therefore, it anticipates that the developed device would benefit highway safety due to an improvement in visibility and legibility compared to the existing VMS and the energy consumption would be less lower than the existing VMS.
Keywords
variable message signs; energy saving; SMD(Surface Mount Devises); VEL(Vms Eco Lens); lighting angle; luminance;
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