THE ANALYSIS OF DAYLIGHT GLARE FACTORS FOR PRINTED-TEXT READING

Abstract

This study investigated the relational structure of daylight glare factors for printed-text reading by using a questionnaire survey and exploratory factor analysis. The relative importance of the extractable factors was evaluated by a conjoint-analysis card-ranking experiment. The importance ranking of 5 adjustable factors (window curtain, ambient light colour, ambient illuminance, distance from window to worker, and usage of desk lamp) was studied by using a physical product presentation. The results indicated that the situation of printed-text reading was mainly made up of four groups, including subjective physiological conditions, interesting levels of the book, environmental conditions, and cognitive psychological conditions. As subjective physiological conditions were the most important attribute, it should be a prior factor in correcting current glare models. Moreover, the usage of window curtains was the most important adjustable factor, which signified the role of daylight utilization in quality lighting design.