About the task-ambient lighting, there are many methods of examining for the combination of task and ambient illuminances. In those examinations, one of the variables, such as the task-illuminance under the fixed ambient illuminance, the ambient-illuminance under the fixed task illuminance, the ratio of task to ambient illuminance under the fixed summation of task and ambient illuminances, and both of the task-illuminance and the ambient illuminance under the no fixed illuminance, is adjusted to become the appropriate condition by the participants. However the adjusted condition is not necessarily appropriate because of the adjusting under the given and limited conditions. It is relatively appropriate condition in the range of given and limited conditions. A purpose of this paper is to examine the appropriate range of the illuminance combination of taskambient lighting by all of those methods.
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