https://www.hpwinner.com/application-of-led-products-in-tunnels.html
Tunnel lighting is different from ordinary road lighting because it must be lit 24 hours a day. The lighting intensity during the day is stronger than the lighting intensity at night. It is conceivable that the electricity cost of the tunnel has become an important part of the operating cost. In addition, tunnel lighting is different from General road lighting has its obvious particularity, including people's ability to adapt to light and shade, space and lighting for the transition between light and shade, etc. These are reflected in the design of tunnel lighting, and are inseparable to the safety of users relation.