Available Light in a Public Building

Purpose of the study Recent researches show that nearly 60 Per cent of human actions are based on visual impressions. These impressions are in turn dependent on lighting, either natural or artificialOne reads in an authoritative League of Nations' publication ' Suitable lighting leads to cleanliness of work places, postponement of fatigue, prevention of accidents, easier discipline and control, limitation of waste and better quality of work with more rapid production'. I*1 addition, light influences people's frame of mindDarkness and semi-darkness are associated with gloom and depression, whereas light creates an atmosphere of brightness, cheerfulness and high spirits. Alternatively it is common experience that damage to eyesight or eye strain and fatigue with consequent inefficient and slow work Is caused by insufficient light at places of workIt is usual in building practice to design in such a way as to provide enough entry of natural light. This is stated as that 20 per cent of fl?0l_ space should constitute the area necessary fQ1 windows, and is approved by public health engineers and officers. It of course goes without saying that all important public building have been planned in conformity with this pri?~ ciple. Even so have we any justification in assuming that at all places of work in these buildings enough light is provided according the standard minimum illumination worked out at 10 foot-candles for office work and from ?