| Keywords |
Illuminance; Visual perception; Office; Fluorescent lighting; Fluctuation range; Visual satisfaction |
| Abstract |
This study examines the effects of illuminance fluctuations on occupants' visual perception and comfort in a small private office. Experiments were conducted in an actual office space, where six fluorescent lighting fixtures were installed and no daylight was available. Twelve healthy college students participated and five fluctuation ranges were applied to the 500 lx of task illuminance on desktops. Reading tasks using a computer and monitor were conducted, while the experiments were performed. Results imply that the level of visual satisfaction was impaired noticeably as the fluctuation ranges increased. The fluctuation range of desktop illuminance should be maintained within 63.34 lx to guarantee visual satisfaction. The perception for visual distraction and stimulus showed a similar tendency as the fluctuation ranges varied. In order to avoid the visual sensation for distraction and stimulus, the fluctuation ranges should be within 97.21 lx and 104.59 lx, respectively. Regression results indicate that the perception for visual satisfaction was affected by the perception for visual distraction, visual stimulus and visual warmness. The visual distraction was the strongest influential factor to the visual satisfaction. The increase of mean vote by 1 on the voting scale led to the decrease of visual satisfaction by 0.441 on the voting scale. |