IEVref:845-29-146ID:
Language:enStatus: Standard
Term: maintenance factor, <of a lighting installation>
Synonym1: MF
Synonym2: light loss factor
[Deprecated]
Synonym3: depreciation factor
[Deprecated]
Symbol: fm
Definition: quotient of illuminance produced by the lighting installation after a certain time interval and the illuminance produced by the installation when new

Note 1 to entry: The English term "light loss factor" and the French term "facteur de perte de lumière" are no longer used.

Note 2 to entry: The English term "depreciation factor" and the French term "facteur de dépréciation" were formerly used to designate the reciprocal of the above quotient.

Note 3 to entry: 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 in the luminous flux of lamps.

Note 4 to entry: The maintenance factor has unit one.

Note 5 to entry: This note applies to the French language only.


Publication date:2020-12
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