Light & Engineering 31 (6)

Volume 31
Date of publication 12/13/2023
Pages 102–108

Energy Effıcıent Human Centered Offıce Lıghtıng: A Case Study on Open Plan Offıce wıth Absent Access to Daylıght L&E, Vol.31, No.6, 2023

Articles authors:

Sevda Aliparast, Sermin Onaygil

Sevda Aliparast, holds Bachelor’s and Master’s degrees in Electrical Electronics Engineering and pursued her Doctorate studies in Energy Science and Technology at Istanbul Technical University (ITU). She is an active member of the Turkish National Committee on Illumination (ATMK), her Ph. D. research focuses on a crucial area of Human-Centric Lighting Technology. Her work in this rapidly advancing field aims to contribute to the evolution of lighting solutions. Her focus extends beyond efficiency and sustainability to designing lighting systems that specifically enhance the well-being and productivity of individuals in diverse environments

Sermin Onaygil, Ph. D., Professor, Doctor, has a Bachelor’s degree in Electrical Engineering, received Master’s and Doctorate Degrees in Lighting Technique at Istanbul Technical University (ITU), Electrical Engineering Department. She continues her academic life at ITU Energy Institute, Energy Planning and Management Department. Founding member of the Turkish National Committee on Illumination (ATMK), Vice President now and represents Turkey in the Division 4 “Transportation and Exterior Applications”, Vice Director in the management team. She is still works as the Vice President of the Turkish Energy Efficiency and Management Association (EYODER) board of directors and serve as Vice President without Portfolio the CIE Administration Board in 2023–2027 term

Abstract:

Our daily behaviours and physiological functions are regulated by the brain’s central biological clock. Consistent exposure to bright days and dim nights is crucial for aligning these rhythms. Since we spend much time indoors, electrical lighting is often relied upon to sync our circadian rhythms. A challenge in promoting circadian entrainment through electrical lighting is the lack of a standardized test for assessing how effectively lighting luminaires provide circadian-effective light to occupants. This study introduces a case study, optimum suspended height (OSH), measuring luminaire efficiency in achieving a circadian stimulus criterion (CS: 0.3) and equivalent melanopic illuminance in lx (EML: 240) for 38 office workers, based on performance and comfort criteria. The paper outlines OSH application to individual linear luminaire type, including suspended-mounted fixtures. In this field study, tests were conducted to explore how indoor lighting affects occupants’ cognitive performance and visual perception. Linear suspended LED luminaires (LSL) were installed in an open-plan office at Istanbul Technical University (ITU), where office workers were exposed to different heights of lighting conditions. They took visual attention tests and assessed proofreading comfort, with alertness measured using the Karolinska Sleepiness Scale (KSS) test. The study aimed to understand the impact of visual fatigue on cognitive performance and perception with. These initial findings shed light on the relationship between office lighting changes and occupants’ cognitive performance and visual perception.

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Keywords

DOI: https://doi.org/10.33383/2023-052

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