06-05-2019, 10:40 AM
Day lighting
The primary source of lighting for daylighting is the sun. The light received by the earth from the sun consists of two parts, namely, direct solar illuminance and sky illuminance
For the purposes of daylighting design, direct solar illuminance shall not be considered and only sky illuminance shall be taken as contributing to illumination of the building interiors during the day.
Daylight factor (DF) is the ratio of the light level inside a structure to the light level outside the structure.
![[Image: image-26.png]](http://frontdesk.co.in/wp-content/uploads/2019/06/image-26.png)
Ei = illumiance due to daylight at a point on the indoors working plane
Eo = simultaneous outdoor illuminance on a horizontal plane from an unobstructed hemisphere of overcast sky
To know more about illumination read ....Day lighting
Illumination in architecture
The primary source of lighting for daylighting is the sun. The light received by the earth from the sun consists of two parts, namely, direct solar illuminance and sky illuminance
For the purposes of daylighting design, direct solar illuminance shall not be considered and only sky illuminance shall be taken as contributing to illumination of the building interiors during the day.
Daylight factor (DF) is the ratio of the light level inside a structure to the light level outside the structure.
Ei = illumiance due to daylight at a point on the indoors working plane
Eo = simultaneous outdoor illuminance on a horizontal plane from an unobstructed hemisphere of overcast sky
To know more about illumination read ....Day lighting
Illumination in architecture