maintenance factor (of a lighting installation) [fm]

ratio of illuminance produced by the lighting installation after a certain period to the illuminance produced by the installation when new

Unit: 1

NOTE 1 The term "depreciation factor" has been formerly used to designate the reciprocal of the above ratio.

NOTE 2 The maintenance factor takes into account light losses caused by dirt accumulation on luminaires and room surfaces (in interiors) or other relevant surfaces (in exteriors, where appropriate), and the decrease of the luminous flux of lamps.

Abbreviation: "MF"

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