High Performance lighting on the road for energy efficiency in tunnels

This paper helps in filling this gap by providing insight in how the tunnel design phase might impact energy efficiency of tunnel lighting. To this end, the different types of influencing tunnel lighting factors in the tunnel design phase are highlighted: the entrance design and related entrance lighting, the reflection properties of pavement and tunnel wall materials, the lighting material (bulbs, luminaire and driver) and the maintenance of the tunnel lighting. At the same time, empirical studies, examples of recent renovation projects and international guidelines are provided for these influencing factors. The paper clearly demonstrates the benefit of involving all stakeholders right from the tunnel design phase to reach high performance lighting in road tunnels