Proceedings right light 2nd european conference on energy-efficient lighting. Energy saving in tunnel entrance lighting. European Conference on Energy-Efficient Lighting [2, 26-29 Set. 1993, Arnhem].

Schreuder, D.A. Swart, L.

1993

530
CIENA

Tunnel entrances may present themselves during the day as a Black hole in which no details can be perceived. In order to ensure safe and comfortable driving also at high speeds, the entrance zone must be lit to high luminance level. This level is closely related to the luminance level outside the tunnel, and also the (equivalent) veiling luminance a car driver experiences when approaching the tunnel. Typical design values are 200 to 500 cd/m2. It is the aim of the research to minimize the hifh expenditure in money and energy values. Modern tunnel lighting technology is focused on two aspects: reducing the veiling luminance by constructional methods, and reducing the installed power required to fulfil the tunnel entrance lighting requirements. In this respect, quality of the tunnel entrance can be scored on a quantitative scale. The research focuses on three items: The accurate assessment of the veiling luminance in the design stage , the energy (and money) saving capability of counter beam lighting under the conditions prevailing in the Netherlands compared to traditional lighting, and assessing the score of existing tunnel entrances, using the contrast sensibility of drivers in real traffic situations as a parameter. The set up and the methodology of the research will be discussed in the paper. The method is based on the measurement of the contrast sensibility threshold in different locations in tunnels. Making these measurements in different tunnels allows for the comparison of the quality of different lighting systems. Accident data are used to select the objects from which the contrast threshold will be made. Additional measurements are needed to allow the assessment of the quality (e. g. the internal contrast of the object, its recognition, the veiling luminance and the meteorological visibility. ABSTRACT. INTRODUCTION. SYMMETRIC LIGHTING AND COUNTERBEAM LIGHTING FOR TUNNELS. ADVANTAGES AND DISADVANTAGES OF COUNTERBEAM LIGHTING. EXPERIENCE WITH COUNTERBEAM LIGHTING. EXPERIMENTS IN THE NETHERLANDS. THE SET-UP OF THE EXPERIMENTS. THE EXPERIMENTAL METHOD. REFERENCES.

EUROPA; ILUMINACION; TUNELES;