Almost all buildings have one or more public spaces, but they have different lighting design needs and considerations. In residential buildings, corridors and staircases are part of the private environment, while in non residential buildings, these places belong to public areas, usually without prominent features. Although the use of public restrooms is personal, their design can vary greatly, from pragmatism to decoration. It is a challenging design to create an environment (such as airport) that can be accepted by individuals in large public waiting areas. In the commercial street, people keep moving and stores compete to attract customers, which shows another challenge of public space design.
To solve the design problem of such public space lighting, there are different methods according to their purposes, but their common point is that the lighting needs are generally fixed, and it is not necessary to adjust with the change of conditions. Once all the lighting of a field is set, the lighting condition will generally remain stable. In public space, all kinds of lamps and light sources, from basic to complex, from practical to decorative, will be used. At the same time, the public space lighting must have an emergency lighting system powered by batteries or emergency power generation design in case of emergency.
It is obvious that the lighting of public space is diversified, ranging from purely functional to dramatic