Nearly 70 percents of Korea’s territory is mountain range. So many tunnels have been built along the mountain range. However, although those tunnels make it easier for people to move, they often waste power unnecessarily. Tunnels in areas where people don't pass frequently consume too much power during the bright days. And some tunnels emit too much light compared to the surrounding light levels, causing confusion to the drivers due to the sudden brightness gap. Accidents in tunnels are very dangerous because of higher incidence and higher mortality than accidents on normal roads. Human eyes take time to adapt to the environment of light when entering and exiting a dark tunnel. This reaction is called dark adaptation and light adaptation. Existing tunnels differ in the number of lights installed at the entrance and the central part of the entrance to enable the eyes to adapt quickly to the light environment. In this project, we proposed a model that aids the adaptation of the eyes in the changing light environment and minimizes the energy waste.