Introduction to tunnel and transportation lighting

Tunnels can be found everywhere these days and no matter what they are used for they lack natural light and therefore need effective lighting solutions. To provide safe passage from one end to the other sufficient illuminance levels must be achieved day and night, throughout the year. Sudden variations in lighting levels when entering or exiting a tunnel are not allowed. At night the lighting levels must be dimmer, while during the day they need to be multiplied and concentrated more at the tunnel entrance. Luminance and illuminance levels, glare and light uniformity all play a big role when designing the luminaires for this purpose as they affect people’s safety. Public transport – trains, trams, boats – as well as stations and harbours have their own lighting requirements and must follow national and industry standards.