Tunnel light dimming enhances safety for drivers

Location: Xiamen/China

The 5.4 km Wenxing Road Tunnel in Xiamen, Fujian Province is using a sophisticated lighting management strategy using Tridonic PCA ECO one4all digital dimming ballasts linked to a Tridonic DSI system.

A key criterion was to vary light levels in a way that would facilitate gradual visual adaptation by drivers entering and leaving the tunnel at different times of day and different weather conditions, while also being energy-efficient with minimum operating costs.

To meet these criteria a 1-10 V dimming control system provides four pre-set lighting levels which can be monitored and controlled centrally using the Tridonic DSI system.

To prevent significant voltage drops across the long cable lengths, a Tridonic DSI V/T high signal amplifier has also been used.