China manufacturer of magnetic ballasts for metal halide flood lights & hps flood lights

As part of the tunnel road, traveling in order to ensure coherence, both day and night at any time without lighting. Highway tunnel operation and management of electricity has become a heavy burden sector. Global energy increasingly tense, tunnel lighting energy-saving design is an important part of the development impact of highway.

Tunnel lighting and general lighting compared to the following questions:

1, the black hole effect when entering the tunnel. Inside and outside the tunnel during the day because large differences in brightness, long distance outside the tunnel, the tunnel entrance showing a black hole phenomenon.

2, into the tunnel after dark adaptation. Car into the tunnel from the bright outside, the eyes take some time to see the interior of the tunnel, that is, "to adapt to lag."

3, low visibility inside the tunnel. As the car exhaust fumes can not quickly dissipate the formation of smog, the light absorption and scattering, reducing visibility.

4, at the exit of the tunnel white hole effect (daytime). As seen through the export of high brightness outside, exports appear to be a bright hole, serious glare. The purpose is to eliminate the tunnel lighting above phenomenon, to ensure safe driving. To this end, the threshold is usually divided into sections tunnel entrance stage, transitional stage, the basic and outlet sections, each section with different lighting to create a safe and comfortable driving conditions. so choose high pressure sodium lamp and ballast.