Experiencing Dynamic Lighting (04-28-17)

Pedersen and Johansson investigated how motion activated street lights influence pedestrian behavior.  They found that participants in their study of motion activated lights in a simulated outdoor environment “walked significantly slower under [initially] dimmed than static lighting conditions, even after the illuminance had increased. . . . The effect was seen both before and after the increase to full light. A reasonable explanation is that participants hesitated at the start of the pathway due to the relative darkness, and this also seems to have affected walking time after the light increase. It may also be that the actual moment when the illuminance increased surprised the participants, so that they did not increase their walking speed as much as expected. The different dimmed conditions did not differ in effect.”  Details on the test conditions: “The standardized Digital Addressable Lighting Interface (DALI) protocol was used for the dimming. The luminaire was set to 254 DALI (100% illuminance) or to one of the three dimming alternatives: 235 DALI (approximately 60% of maximum illuminance), 221 DALI (approximately 40% of maximum illuminance) or 195 DALI (approximately 20% of maximum illuminance).”  The starting point of the test walk was always lit to .2 lux, and at the motion-detecting sensor lighting varied from 1.5 lux in the 20% condition to 5.6 lux in the 100% condition.

E. Pedersen and M. Johansson.  “Dynamic Pedestrian Lighting:  Effects on Waling Speed, Legibility and Environmental Perception.” Lighting Research and Technology, in press.