| quotient of the light reflected by the surfaces of a room after a certain time interval and light reflected when the installation is considered conventionally as new Note 1 to entry: The room surface maintenance factor has unit one. Note 2 to entry: The room surface maintenance factor is based on a simplified model for the effects of the deterioration of room surface reflectance properties and does not accurately account for room geometry and configuration. Note 3 to entry: This note applies to the French language only.
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