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The most commonly used metric for measuring daylight in a building is called the "daylight factor"-expressed as a percent of available exterior daylight.

Daylight factor is defined as a ratio of interior illuminance at a horizontal point in a building to the sun-shaded exterior illuminance on a horizontal surface under a fully overcast sky (a ratio of outside illuminance over inside illuminance).

The higher the daylight factor, the more natural light that is available in the room.

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