The influence of spectral properties of light in street lighting on visual perception

Human visual perception in terms of spectral properties of light is influenced by three basic components, which are the light source and its spectral distribution of the radiant power, observed object and its spectral properties of surfaces and human eye and its spectral sensitivity. The resultant visual perception is influenced by the interaction of these three components. In the case of street lighting, where the spectral sensitivity of the human eye is changing and where the light sources with very different spectral distribution are used, the real perception is significantly influenced by the choice of light source. The paper describes the influence of different light sources on the visual perception in terms of street lighting.