The primary source of lighting is the sun. Light received by the earth from the sun consists of two parts, direct solar illuminance and sky illuminance.
For the purposes of daylighting design, the only sky illuminance shall be taken as contributing to the illumination of the building interiors during the day
For good distribution of daylight in a room, window height, window width and height of sill should be chosen accordingly. Generally, while taller openings give greater penetrations, broader openings provide better distribution of light. Openings shall be provided with chajjas, louvers, baffles or other shading devices to exclude direct sunlight entering the room, as much as possible.
Two types of lighting techniques are commonly used.
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