... criteria should consist of all these factors. However the choice of materials depends on several issues such as, age of occupiers, level of activity of occupiers, use of space etc. Key environmental Factors: a) VISUAL COMFORT To be able to see well enough in buildings is a fundamental need for occupants to do their work safely and comfortably or live comfortably in a pleasant environment. There should be efficient lighting provided which is not rather bright, nor rather dull. Glare will be caused if there is a big bright source of light and will give occupiers visual discomfort and might cause visual disability. Efficient light is measured in lumens/m² or lux and generally described in terms of the illuminance which is the amount of light reaching a surface. A domestic 60W light bulb emits approximately 700 lumens. Different illuminance is required to do different tasks from moving around safely to do restoration work ...

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