The use of solid-state lighting poses new challenges for office lighting design. Efficient optical systems and lighting controls allow for highly adapted lighting installations. As a consequence, lighting designers have to consider the occupants’ visual preferences and individual psychobiological differences in a more precise way. Up to now, research on lighting quality mostly exists with regard to fluorescent lighting technology. The impact of solid-state lighting characteristics on visual appearance has not been investigated extensively. The following research questions occur: How do office lighting conditions influence room appearance? How does a person’s chronotype influence lighting appraisal of a space at a given time of day? The research questions were investigated in a special office lighting simulator aiming at a strict separation of photometric criteria potentially influencing room appearance. The appearance of the space was rated by a total of 102 participants in two experimental sessions under different lighting conditions. Independent variables were the luminance of walls and ceiling, horizontal illuminance around the task area and background luminance distribution. Participants were divided into groups according to their chronotypes and rated the space at different times of day. Dependent measure was the subjective rating of the space on the two scales ‘visual lightness’ and ‘visual attractiveness’. The outcomes of this work show a marginal influence of surrounding area illuminance on the perception of visual lightness. Visual attractiveness was not affected. Wall and ceiling luminance significantly influenced visual appearance of the office space regarding visual lightness and visual attractiveness. The luminance distribution of walls and ceiling significantly influenced the perception of visual attractiveness and visual lightness. Coherent and relatively uniform distributions werer rated as brighter and more attractive. The interaction between the participants’ chronotype and the time of observation showed a statistically significant effect on room appearance for the first experimental session. Morning types perceived the space as lighter and more attractive in the morning than in the evening. For evening types the opposite was true. The same effect was found to be non-significant during the second session. However, exploration of the gathered data suggested, that this might be due to the smaller sample size. The results can help to define minimum recommendations for photometric parameters influencing visual appearance in offices with higher accuracy and to include human needs and individual differences in the lighting design process.
|Advisor:||Völker, StephanVeitch, Jennifer AKnoop, Martine|
|School:||Technische Universitaet Berlin (Germany)|
|Source:||DAI-C 81/1(E), Dissertation Abstracts International|
|Subjects:||Design, Optics, Electrical engineering, Architecture|
|Keywords:||Interior lighting design|
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