Küller, R., Ballal, S., Laike, T., Mikellides, B., & Tonello, G. (2006). The impact of light and colour on psychological mood: A cross-cultural study of indoor work environments. Ergonomics, 49(14), 1496-1507. doi:10.1080/00140130600858142
Rikard Kuller, from the Department of Environmental Psychology for the School of Architecture at the Lund Institute of Technology in Sweden leads the study with Seifeddin Ballal, Thorbjorn Laike, Byron Mikellides and Graciela Tonello. The study explores the linkages of between indoor lighting, and colour on the effects of moods of those working in doors. The research was conducted in real work environments throughout different seasons in different countries. Participants were asked to report on their emotional well being through answering “How did you feel most of the time during the last few days?” Answers were recorded over twelve different scales: rested/tired; alert/drowsy; awake/sleepy; interested/bored; efficient/inefficient; devoted/indifferent; secure/anxious; friendly/angry; happy/sad; confident/hesitant; independent/dependent; and strong/weak. Participants were then asked to appraise their work environments in three categories of current lighting conditions (measured also through calibrated luxmetres), interior decoration in terms of colour, and then the estimated physical distance from workspaces to the nearest windows. The researched concluded that inter-correlations between estimated of the visual environment and seasons were low, however emotional status was higher throughout the year for those in colourful work environments. The connection between light and colour influenced emotions in a similar way with workers feeling more alert, confident, friendly, and interested. In the months of darker outdoor light, February, there was a negative influence with mood and that while light may have moderate, the simple view function has a positive impact for workers. Between the research in the four countries studied: UK, Sweden, Argentina, Saudi Arabia should that light and colour had a strong influence on mood while illumination had no significant impact. The study concluded that the use of colour, not necessarily high-saturated tones, increases emotional well-being for workers, and even in the lack of light brighter colours still had an effect. This article provides detailed research for understanding the effects of colour, available light and window light on emotion. Given the detailed use of statistical data and language, this article is best suited for an advanced audience. However, the article established strong correlations, and should be of high interested to any reader in creating effective and productive environments.
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