In the recent method of calculating the cooling and heating load in buildings, the transient load is obtained by taking account of heat stored in parts of a building and heat transfers from luminaires to the environment. Though the above heat transfers are mainly made in four ways of radiation and convection from the luminaires to the room and plenum, the proportion of the heat transfers in each way to the electrical inputs of the luminaires is defined as the distribution coefficient of the thermal energy. We have made calculations of the transient load in the Omori Building of Hitachi, where a plenum return system and a common structure as Japanese building are used. As the result, the accuracy required in measurements of the distribution coefficients has been analyzed in the viewpoint of designing air-conditioning systems. The distribution coefficients must be measured with an error less than 15% for illuminance of 2, 000lx, in the case where the cooling load should be obtained withe an error of 3%. And also these coefficients should be measured with an error less than 12% to calculate the heating load, on the assumption that lighting designs are made with an error of 5%.

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In order to establish a comprehensive method for adequate illumination of solid objects, the following questions must be clarified.
How may the three-dimensional distribution of light exert influence on appearance of solid objects?
To clarify this question, many studies such as Moon and Spencer's, Hewitt's, Cuttle's and Fischer's were carried out.
But many problems to be solved have been left as yet.
The purpose of this study is to examine the following problems.
(1) What are the lighting conditions required for preferable appearance of solid objects when a small source is used as a directional lighting?
(2) How may size of directional lighting exert influence on appearance of solid objects?
Several experiments are carried out to examine the first.
The following are Clarified.
(1) Preferable direction of the flow of light
(2) Preferable ranges of the vector: scalar ratio

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The previous paper considered the way in which the appearances of solid objects are influenced by a small directinal lighting.
The purpose of this paper is to examine the following problems.
(1) How may size of directional lighting exert influence on appearance of solid objects?
(2) What is the most appropriate modelling index?
Three experiments are carried out to examine these problems.
The following are clarified.
(1) In which way may size of directional lighting exert influence on preferable direction of flow of light and preferable vector: scalar ratio?
(2) Vector: Average illumination of the visible hemisphere ratio is a very approriate modelling index.

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