Restricting the view of human perception to a physiologically orientated level led to unsatisfactory lighting concepts. Approaches at a new lighting philosophy that no longer solely considered quantitative aspects arose in the USA after World War II. Expanding the physiology of the visual apparatus by adding the psychology of perception meant that all factors involved in the interaction between the perceiving observer, the object viewed and the facilitating medium of light now came under consideration. The perception-orientated lighting design no longer primarily thought in the quantitative terms of illuminance levels or luminance distribution, but in terms of the qualitative factors.
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