Predominancy of the Ceramic Metal Halide Lamp in a Mesopic Vision Level about Road Lighting(Efficient and Safe Lighting Based on the Spectral Sensitivity of Human Vision at Mesopic Light Levels)

Abstract

Near the road shoulder which serves as the minimum luminance in road lighting, it becomes the visibility of a mesopic vision level and feels bright the ceramic metal halide lamp with many short wavelength ingredients compared with a high-pressure sodium lamp.