Fairly accurate factors can be established for 3 of the 4 variables which affect light loss in the luminaire. Thus, for a given installation, it is possible to pick values for lamp lumen depreciation, luminaire dirt depreciation, and reflecting surface depreciation from the data established in the article and obtain a reasonably accurate maintenance factor for street lights in service, as well as for use in calculations of new installations.
Field evalustion of roadway lighting maintenance factors
Journal of the Illuminating Engineer Society ; 66 , 2 ; 90-98
1971
9 Seiten, 11 Bilder, 2 Tabellen, 6 Quellen
Aufsatz (Zeitschrift)
Englisch
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