The study presented in this paper is concerned with a search for evidence that the 'behavior setting', modified or altered by en-vironmental lighting, produces (creates) environmental cues or signals; and that the participants may tend to respond or act upon these cues in some consistent way. The experiment was conducted in a room in which the only physi-cal alterations were changes in the lighting arrangements. The methods for evaluating the subjective quality of space were a number of scientific techniques, most notably: (1) semantic dif-ferential rating scales for factor analysis, (2) ultidimension-al scaling, and (3) observation and mapping of overt behavior.