Defining pedestrian's visual adaptation field under night lighting in Venice

Pedestrian areas use lighting systems with output at the mesopic level, which is situated between the photopic and scotopic. Studies have shown surrounding luminance effect on peripheral vision and its magnitude of the effect is larger than that of the foveal luminance. This study aims to examine this proposed model using real night time lighting conditions experienced by pedestrians in dark and narrow alleys and pathways close to water ways in the city of Venice. The eye tracking system and luminance scanning are used to measure such conditions while walking at night. The pedestrians' eye gaze angle data under non uniform background luminance show that peripheral luminance affect pedestrians' adaptation field differently given the pathways' geometry. Luminance adaptation data under mesopic lighting conditions contributes to the lighting system design while meeting the requirements with recommended practice for safe walkway lighting design.