buildings play an important role in the energy demand sector. due to the increase of environmentalconcerns and renewable energy sources restriction, lighting control systems will play an important role in the reductionof energy consumption of the lighting without impeding comfort goals. lighting control systems can control lightingconsumption according to the type of building, adequate luminanc...

Because existing image abstraction systems can hardly incorporate with the changing light, we present an integrated image abstraction and relighting rendering system, which is based on a salient edge-guided luminance field optimization approach. For an input image, we first adopt a sparsity prior-based illumination decomposition method to remove its original illumination and have an intrinsic i...

Light-emitting diode (LED) road lighting has been widely implemented in recent years, but few studies have evaluated its performance after installation. This study investigated whether LED road lighting complies with minimum regulations in terms of traffic safety and whether improvements for energy efficiency are possible. Average road surface luminance (L), overall luminance uniformity (Uo), l...

Since introduced in the 1960’s, energy efficiency standards and labels have been widely adopted in the world as one of the most effective policies to raise end-use energy efficiency. These policies have gained increasing popularity among government agencies because not only they are effective tools in achieving energy saving and climate change goals, but also they can bring substantial economic...

This paper presents the first global estimate of lighting energy use, costs, and associated greenhouse-gas emissions. Based on a compilation of estimates for 41 countries representing approximately 63% of the world’s population, we develop a model for predicting lighting electricity use for other countries where data are lacking. The corresponding lighting-related electricity production for the...

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We focus on office lighting environment and conduct a study of Intelligent Lighting System that provides light brightness in accordance to an individual office workers’ needs. For purpose of commercialization of this system, Intelligent Lighting System using in-office frame was introduced at Kokuyo Co., Ltd. This place is a special work area used for meetings and discussions, etc. Intelligent L...

Smart city is an attractive way of making the city more livable through intelligent solutions that are enabled by information and communication technology. Regarding the lighting system, it achieves the perfect balance between beautiful city ambience and preserving the darkness that makes cities more livable. As a smart city component, a public lighting system offers much more than light itself...