Mehdi Amirkhani
Dr Mehdi Amirkhani is an active researcher in the area of lighting design in buildings, specializing in innovative energy-efficient daylighting systems, evaluation of the luminous environment, and lighting effects on health and wellbeing. He has been a scientific member of four international conferences. He is also an Associate Fellow of UK Higher Education Academy (HEA) and a member of the Architectural Science Association (ASA).
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or discomfort for occupants. Consequently, building users may choose to intervene in lighting conditions
through closing blinds and turning on the lamps in order to enhance indoor visual comfort. Such
interventions increase projected electric lighting use in buildings. One simple method to prevent these
problematic issues is increasing the luminance of the areas surrounding to the bright surface of windows
through the use of energy-efficient supplementary lighting, such Light Emitting Diodes (LEDs). This paper
reports on the results of a pilot study in conventional office in Brisbane, Australia. The outcomes of this
study indicated that a supplementary LED system of approximately 18 W could reduce the luminance
contrast on the window wall from values in the order of 117:1 to 33:1. In addition, the results of this
experiment suggested that this supplementary strategy could increase the subjective scale appraisal of
window appearance by approximately 33%, as well as reducing the likelihood of users’ intention to turn
on the ceiling lights by about 27%. It could also diminish the likelihood of occupants’ intention to move
the blind down by more than 90%.
or discomfort for occupants. Consequently, building users may choose to intervene in lighting conditions
through closing blinds and turning on the lamps in order to enhance indoor visual comfort. Such
interventions increase projected electric lighting use in buildings. One simple method to prevent these
problematic issues is increasing the luminance of the areas surrounding to the bright surface of windows
through the use of energy-efficient supplementary lighting, such Light Emitting Diodes (LEDs). This paper
reports on the results of a pilot study in conventional office in Brisbane, Australia. The outcomes of this
study indicated that a supplementary LED system of approximately 18 W could reduce the luminance
contrast on the window wall from values in the order of 117:1 to 33:1. In addition, the results of this
experiment suggested that this supplementary strategy could increase the subjective scale appraisal of
window appearance by approximately 33%, as well as reducing the likelihood of users’ intention to turn
on the ceiling lights by about 27%. It could also diminish the likelihood of occupants’ intention to move
the blind down by more than 90%.