Tunnels are designed for the brightest outside conditions. This stage of maximum brightness, however, is necessary only about 10 percent of the time. The rest of the time the entrance lighting level needs to be adjusted downward to different lighting stages, so as not to overlight the tunnel, which can result in consumption of too much power.
On the basis of the L20 portal luminance measurement, the tunnel’s control system will regulate its different lighting stages.
The number of stages has historically been defined as: sunny, bright, clouded, dusk/dawn. But today, using controls and connected LED lighting, it’s possible to add more stages and adjust the lighting to maximize the efficiency of the installation based on the conditions that exist outside. A control system like Philips BaseLogic, in concert with LED luminaires, can facilitate up to 12 different stages, improving the accuracy of your installation.
Philips TunneLogic control system, designed especially for LED lighting, can even provide for continuous dimming so that it corresponds exactly to the level of brightness outside. This complete tunnel lighting control and monitoring system lets you maximize visibility, safety and driver experience along the length of your tunnel.