This paper presents the initial findings of an investigation into lighting appearance and the possibilities for its description using a photometric approach. The study shows that by describing the light pattern using the average luminance and the luminance distribution standard deviation of the most important area of the field of view, i.e. the horizontal 40° band, the acceptability of the Iighting appearance can be measured and calculated. Although this is still a simplistic approach, it provides a step towards better lighting installations, which could have benefits of comfort, productivity and energy efficiency as well as demonstrating a better understanding of the subject.
Architectural developments over the past fifty years have been dramatic and have been paralleled by active research in lighting. This review traces architectural themes and the corresponding concerns of lighting researchers and explores how they have applied the results of scientific research into lighting design and application.
The path leading from lighting quality through preference and mood to human health and well-being was defined as the 'Appraisal Path' by Veitch et al. (2008). This study aims to investigate the appraisal path under uncontrolled cafes, and to compare the results between daylit and non-daylit cases as well as the cultural differences between the UK and South Korea. A daylit café and a nondaylit café were chosen for the field survey both in London and Seoul. Then, customers' experiences and feelings in the cafes were investigated by using a customized questionnaire, in terms of quality of lighting, feelings, attractiveness, satisfaction and eye discomfort. 66 customers (49 for daylit, 17 for non-daylit) were randomly selected and questioned in London and 102 customers (62 for daylit, 40 for non-daylit) participated in the field survey in Seoul. As a result, four different appraisal paths were found. No significant relationship was found between perceived lighting quality and perceived eye discomfort at daylit cafes in both London and Seoul. On the other hand, it was found that perceived lighting quality was a key determinant factor on perceived eye discomfort regardless of the cultural differences at non-daylit cafes. However, there was a significant cultural difference in factors affecting perceived lighting quality.
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