Road lighting effects on traffic accidents and varies with pavement materials and weather conditions. In conditions of wet, poor uniformities and glare due to high specular reflection have been found and negatively effect on visual performance of drivers. To improve light quality, the adaptive roadway luminaire which has multi light distributions which are suitable for dry and wet road surfaces is proposed. However, wet conditions is very complicated because of its dynamic characteristics. The pavement light reflection properties in wet conditions were studied in this paper. Three various materials and aging having concrete, rough asphalt and fine asphalt were extracted to do the experiments in the laboratory by using the modified gonioreflectometer. The results showed the different of dynamically changing of specular factor (S1) and the major r-values of various pavement materials in wet conditions. They can be divided into three stages. Moreover, changing of the reflected light colour are disappeared over wet surfaces.

In the night time, Street lights are used to illuminate for drivers or pedestrian. The main purposes have improved visibility in night vision and safety. LED Street light was used instead traditional luminaires. The range of colour temperature is starting at 2700K from now on. Light sources with high colour temperature are appearing brighter due to the high scotopic lumen. Cause of short wavelength is more affect eye sensitivity in the mesopic vision. The proportion of scotopic luminous flux and photopic luminous flux were used to indicate and call that s/p ratio. However, light sources with high colour temperature are generating more blue light. While the brightness of low colour temperature is less effective in the mesopic range. This paper present 4000K LED streetlight with high s/p ratio.