Lighting configuration plays a major role in controlling visual comfort and lighting consumption in building. Many studies have focused on the lighting energy consumption of office buildings and institutions but there is still a lack of studies that have focused on open structure buildings such as Rest and Service Areas for Highway (RSAs). RSAs are highway facility which lighting layout of the building tends to adapt conventional lighting design approaches, resulting in energy wastage. Knowing the scorching and humid climate in Malaysia throughout the year, there is a high opportunity to harvest natural daylight and reduce artificial lighting consumption. The existing lighting performance of the building showed a very high luminance levels, for which the optimum lighting illuminance should be proposed. Hence, this study aims to analyse the optimum lighting configuration of RSAs Ayer Keroh Northbound Malaysia by modify on the existing lighting’s layout of the building. The illuminance performance and lighting energy consumption is identified by using RELUX desktop and DesignBuilder software respectively. Next, the study proposed a new lighting layout for reduce energy consumption and provide an optimum visual comfort for users. The building geometry is modelled by Autodesk Revit and Building Energy Index was determined by Insight 360. The result from proposed lighting layout demonstrated significant energy saving potential, achieving a 24% reduction in total annual lighting load and RM 48,432 annually was saved from electricity cost.