Safety is the most important factor for tunnel lighting.
Unlike driving on the open road, the tunnel is divided into 3 different zones: entrance, transit, and exit. Good lighting for tunnels will help the driver to avoid the black hole effect at the entrance and the white light phenomenon at the exit. In order to achieve this, good tunnel lighting must provide extraordinary visibility and uniformity.
In addition, tunnel lighting usually works under a harsh environment, and the hydrogen sulfide contained in automobile exhaust will harm the LED; therefore, when we design the light specially for the tunnel, the heat sink must have super anti-corrosion performance, and the LED we usually choose Nicha brand because of its best antisulphur performance.
Reliability is also another very important point that should be considered. Tunnel closure means a very high maintenance cost and will cause serious potential traffic safety problems.
We have accumulated rich experience in LED tunnel light projects, especially in some European countries like Austria; our customer says their project is special because the end user is not willing to change the heat sink of the previous tunnel light installed several years ago. The reason is that their previous heat sink has very good anti-corrosion performance and, at the same time, they can save a lot of money if they just retrofit the inside light part. We have thus designed the retrofit kits specially, too.
