Importance of Daylighting | Components of Daylight factor

Daylighting | Components of Daylight factor

Daylighting is the practice of the designing various types of openings to admit daylight into the working space for efficient and comfortable living. The orientation, shape and size of the openings play an important role in daylighting.

Daylighting could be provided with the help of windows, skylights, courtyards etc.

Skylight providing internal illuminance
Skylight providing internal illuminance

Daylight factor

Daylight factor can be defined as the sum of all daylight reaching an indoor reference point.

The three important components considered for the estimation of total amount of daylight reaching a particular point is as follows:

  1. Direct light of the sun
  2. External surfaces reflecting light directly to the point
  3. Internal surfaces reflecting and interreflecting light to the point

Each of the three components when expressed as a ratio or percent of the simultaneous external illuminance defines the sky component (SC), external reflected component (ERC) and internal reflected component.

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