# How do you calculate average daylight factor?

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## What is a good average daylight factor?

In domestic buildings, it states “… Kitchens achieve a minimum daylight factor of at least 2%; living rooms, dining rooms and studies achieve a minimum average daylight factor of at least 1.5%, and 80% of the working plane should receive direct light from the sky”.

## How is daylight autonomy calculated?

The analysis of daylight autonomy is based on the assumption that when natural light is no longer sufficient, the artificial lighting is on. The calculation is done according to a minimum threshold of illuminance, usually 300 or 500 lux, measured on the work plane, and hours of building usage.

## What is daylight factor and its components?

Daylight Factor (DF) consists of three components, Sky Component (SC), External Reflection Factor (ERC), and Internal Reflection Factor (IRC) [9].

## How do you increase daylight illumination?

Suggestion For Improving Daylight Illumination

1. Should be facing north or south, for uniform illumination and to avoid undue heating of rooms from sunlight.
2. If this cannot be done, then window shading can be used to reduce the entry of heat from sunlight.

## How do you calculate borrowed light?

It is calculated based on the floor area of a habitable room. A window opening is required that has an area 10% of the floor area of the room. Light may also be borrowed from the adjoining room. The area of the two rooms is combined, and openings provided must equal 10% of the total floor area for compliance.

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## What is daylight analysis?

Daylight analysis is normally performed in the later stages of building design. These analyses are generally carried out by specialized engineers who focus on the performance of individual rooms. Daylight factor is the most common metric for this purpose and many national codes are based on this type of assessment.

## How do you calculate natural light in a room?

For Natural Light

A three foot by four foot window would provide 12 square feet of natural light to the room – again, the required minimum. Pretty simple really. For every 10 feet of floor area you need one foot of natural light area.

## What is daylight autonomy?

In mathematical terms, daylight autonomy is the percentage of annual work hours during which all or part of a building’s lighting needs can be met through daylighting alone.

## What is the utilization factor in lighting?

Utilization Factor or Co-efficient of utilization. It may be defined as “the ratio of total lumens received on the working plane to the total lumens emitted by the light source”. i.e. It may be defined as “the ratio of illumination under normal working condition to the illumination when everything is clean or new” i.e.