Quality of interior lighting - Illumination level

4 important questions on Quality of interior lighting - Illumination level

Illumination level (symbol)

Em

Why do we need to set the initial illuminance higher than the maintained value?

In order to account for degradation of the room's surfaces and lighting systems over time

What factor accounts for the degradation of light and surfaces?

The maintenance factor (MF)
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What is the uniformity of illuminance (symbol+explanation)?

[mu]0; defined as the ratio of the minimum illuminance to average illuminance with given area

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