Effects of Illumination and Color Temperature Distribution on Subjective Perception

There is ample evidence to support the hypothesis that indoor lighting environment has an impact on human affective and cognitive processes. Light distribution is one of the important aspects of the indoor lighting environment. With the development of various pendant luminaires and LED technology, both photometric and colorimetric distribution in vertical can be adjustable thus different lighting schemes can be achieved to satisfy the need for lighting design.The present study of light distribution in a real lit office conducted two parts of experiments. The aim is to discuss the impact of proportions of direct/indirect lighting on both subjective evaluation and work performance, also include the discussion of the distribution of correlated color temperature (CCT) of direct/indirect lighting in an office space.