الفهرس 
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Abstract
When we evaluate the performance of building, we choose the strengths and
weaknesses elements which enable us to progress the design process and get the best
elements that help us to live in nice premises associated with a good nature, easy-to-use
and having the best exploitation career, and the elements of evaluation are many including
the evaluation basis on good ventilation and thermal comfort inside the space and the
integration between form and function and the easy accessing to the building, ... and other
many elements that serve and help increasing the efficiency of the building. from those
elements which the assessment is based on, is the component of energy consumption that
the less the energy consumption the more the economic value of the building and its
maintenance to be less as well, from here it is appear to us the importance of actual use of
natural lighting as a lighting source in the building spaces, especially in regions and
countries having very light and bright climate so the electrical power to be saved in the
work time during the day, and it worth mentioning that the majority of office buildings in
Egypt work in the moming only, therefore the use of natural lighting as an alternative to
the industry lighting is an economic saving for the country.
The importance of light is in identifying of features (or when seeing things
surrounding us), that some things to be appeared through reflecting lights from those
things to our eyes. Often been recognized that natural lighting is an important source of
saving energy and provides visual and psychological comfort for the occupants of office
buildings, that working in the day time with natural light is very comfortable to eyes and
linked with nature and in addition its increase the labor productivity, (Tzempelikos, A. et
al., 2007) and all the world as well get tired of consumption continuous electric power
uses within buildings, particularly the huge buildings as offices Companies.
Lighting is divided into two sections, artificial light: It is various kinds and forms, like
white or fluorescent lighting and others ... and is a major consumer of energy in buildings,
secondly: natural lighting, which comes from a natural source (the sun), and it is changing
and depending on time, location, season, distance from the equator and the weather.
(Millet, S.M. and Barrett, c.r, 1996)
The natural light is divided into visible light and invisible ultraviolet, like infrared and
the basic of our conversation here is the visible light. (Danny H.W. Li. et al., 2007; and
SMITH, G.B. et al., 1998)
Natural lighting is an important feature in the design which appears the beauty of
environmental and the human factors together. Lighting design today (which can be seen a
single subject under continuous design) can be explored from different views, it is not a
general feature of different design that would address natural lighting by different people
during the design process, in extreme cases, ”building scientists” to study the energy and
environmental impacts of natural lighting, explore the ”designers” of formal and aesthetic
results, and the title of ”behaviorists” is the humanitarian consequences of natural lighting
installed and the problem is that the integration of disparate issues, natural lighting, it
seem may include many of the considerations (and perhaps working people), many accept
that the design includes natural lighting of the working environment, designed hardener,
and other human factors. In spite of this, stress that the natural lighting within the context