Description: Аre considered features of functioning of systems of external illumination of cities. Key parameters of a stream of refusals obligatory for the statistical account and the analysis of factors of influence are defined. Recommendations about construction of system of the account and control of a stream of refusals are generated. Specific indicators of reliability of systems of external illumination are presented.
Keywords: lighting options, outward illumination, reliability of city networks, reliability of the lighting systems: evenness of distributing of brightness, limitations of blinding action, rejections of tension, prime price of exploitation of lamp