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GATE-Architecture-Planning-2018-->View question

## The indoor illumination requirement for a building is 350 Lux. If the daylight factor is 2.7 and the design sky illuminance is 9000 Lux, then the required supplementary artificial lighting is ____________ Lux (GATE-Architecture-Planning-2018)

The indoor illumination requirement for a building is 350 Lux. If the daylight factor is 2.7 and the design sky illuminance is 9000 Lux, then the required supplementary artificial lighting is ____________ Lux (GATE-Architecture-Planning-2018)

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A daylight factor (DF)  is the ratio of the light level inside a structure to the light level outside the structure. It is defined as:

DF = (Ei / Eo) x 100%

where, Ei = illuminance 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 calculate Ei, requires knowing the amount of outside light received inside of a building. Light can reach a room via through a glazed window, rooflight, or other aperture via three paths:

1. Direct light from a patch of sky visible at the point considered, known as the sky component (SC),
2. Light reflected from an exterior surface and then reaching the point considered, known as the externally reflected component (ERC),
3. Light entering through the window but reaching the point only after reflection from an internal surface, known as the internally reflected component (IRC).
The sum of the three components gives the illuminance level (typically measured in lux) at the point considered:  Illuminance = SC + ERC + IRC

Indoor illumination = (Outdoor/Sky illumination x daylight factor)/100

So indoor illumination = (9000 x 2.7)/100 lux = 243 lux

So required supplementary artificial lighting = 350 – 243 = 107 lux

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