Performance of induction lamps and HPS lamps in road tunnel lighting

The characteristics and performance of two tunnel lighting systems are investigated in this paper. Tunnel No. 1 is installed with induction electrodeless fluorescent lamps and tunnel No. 2 is installed with high pressure sodium (HPS) lamps. The luminance levels and illuminating uniformity with two systems were measured and analyzed. The spectrum and energy cost have also been studied. Additionally, the responses of drivers were investigated. By the comparison of these two tunnel lighting systems, it was found that the tunnel lighting system with induction lamps shows advantages in high brightness perception to drivers, good color rendering, higher uniformity, better safety perception to drivers and low energy cost over the tunnel lighting system with HPS lamps.