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Obstacle detection: A pilot study investigating the effects of lamp type, illuminance and age

School of Architecture, The University of Sheffield, The Arts Tower, Western Bank, Sheffield S10 2TN, UK

^* To whom correspondence should be addressed. E-mail: steve.fotios{at}sheffield.ac.uk.

	Abstract

A novel apparatus was used to examine the effect of light source, illuminance and observer's age on the ability to detect obstacles in peripheral vision, simulating a raised paving slab under mesopic visual conditions. The data collected were used to determine the height of obstacles above the paving surface required for 50% detection. From these detection heights it was determined that: (1) obstacle detection was influenced by illuminance, the 50% detection height being lower at 20 lux than at 0.2 lux, (2) the young observers (<45 years old) showed the smaller 50% detection height at 0.2 lux, but at 20 lux there was no difference in obstacle detection height between the younger and older (>60 years old) age groups, and (3) obstacle detection was affected by lamp type at 0.2 lux, with the 50% detection height decreasing as lamp S/P ratio increased, but at 2.0 and 20 lux there was no significant difference between the three test lamps.

First published on September 2, 2009
Lighting Research and Technology 2009, doi:10.1177/1477153509102343


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