Spectral effects in escape route lighting

This experiment investigates how the ability to move over an obstructed escape route is affected by the spectral power distribution of the lighting. Measurements were made of the speed of movement, the number of collisions, and the perceived difficulty of moving over the escape route, immediately after the ambient lighting of the space was extinguished, for 15 different combinations of light level and spectral power distribution. The results show that all three types of measurement are much more closely related to scotopic illuminance than photopic illuminance.