First, the human advantages: by getting daylight into the centre of deep plan buildings, this provides the occupants with a sense of orientation, information on the time, weather and the world outside the building; together with a sense of space and expansive views which may compensate for the lack of external views from the building.
Second, the environmental advantages: there is a potential for savings of energy, assistance with the problems of ventilation, and a reduction in the need for air-conditioning. Depending upon the orientation and detail of the rooflight there may be a need for some solar shading.
On balance the advantages outweigh the disadvantages, as over the life of the building the cost of the people who work there greatly exceeds those of its construction, and the work environment is crucial.
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