Study of Luminous Distribution Design of Tunnel Base Lighting

Unlike more general structures, a tunnel is a space that has district particularities such as the need for lighting even in the daytime. It is necessary to install appropriate lighting equipment, especially ef fi cient lighting equipment, in tunnels. Light distribution of luminaire is a factor that affects the equipment scale. However, the relationship between light distribution and energy consumption has not yet been clari fi ed. Against this backdrop, we propose a light distribution design method for highly ef fi cient tunnel lighting that reduces energy consumption and a tunnel lighting design method that optimizes the features while ful fi lling lighting performance requirements based on the relationship between the light distribution of tunnel lighting and the illumination characteristics for tunnel luminance (symmetrical lighting method) used as existing tunnel luminance. We evaluated the effects of luminance on the light distribution by simulations in an actual tunnel and con fi rmed the effectiveness of the energy saving.