Different dayligting techniques in office buildings are necessary to deal with the problems associated with sideligting like overheating, exessive brightness and discomfort glare, especially in hot and arid regions where solar radiation availability is enormous coupled with high air temperatures. This problem can be approached by using a lightshelf daylighting delivery system which manipulates sunlight and daylight both in terms of its light and heat by shading view apertures below the lightshelf to reduce solar heat gain and glare and by reflecting light deep into the space through clerestory apertures above the lightshelf. However, it has't shown until now what is the best combined lightshelf configuration on an envelop of multi-story buildings that will provide good interior luminous environment in terms of adequate amonient lighting, uniform ligting distribution, reduced glare discomfort coupled with reduced energy consumption. This paper presents methodology and results for the evaluation of this system performance.
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