Lighting of tunnels and subways is intended to provide safe traffic of cars and pedestrians not only at dark but also at light time of a day. This feature is caused by the fact that lighting in tunnels and subways should be nearly identical to the Sun light. In this case the human sight will adapt to changes of light levels faster, and it means that the accident rate will be much less.
Lamps for tunnels and subways should correspond the technical requirements of normative documents. Thus, the lighting system of every subway object is selected be experts in the field of lighting technologies individually.