Lokesh, J and Hassan, Zaib and Joneja, Pranav (2015) Understanding of Mesopic photometry and maintaining brightness while saving energy in residential roads – An approach. In: LUX PACIFICA, 27/11/2015, Hotel ITC Sonar, Kolkata.

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Abstract

Psychological aspect of light relates to the human perception of the environment and doesn’t have anything to do with the amount of light being emitted by the light source. Perception of space is directly connected to the way light integrates with it. Lighting can impact the safety perceptions of pedestrians and their subsequent use of roadway systems. It has been found that in the Mesopic region (the lighting levels found on roads at night time) lamps with a higher Scotopic / Photopic (S/P) ratio appear brighter at the same illuminance than lamps with lower S/P ratios. This means that lamps with a high S/P ratio can be used either at the same illuminance to create a higher brightness or at a lower illuminance but the same brightness, the latter leading to a reduction in energy consumption. The research work deals on the relationship between lamp spectrum, brightness and S/P ratio in the context of residential roads. Lighting design for such roadsconsiders primarily the needs of pedestrians rather than drivers. This can have implications for urban and suburban locations where pedestrian use is an important design consideration for roadside infrastructure [1][2][3]. However, brightness is not the only factor that matters for the lighting of residential roads. The ability to detect obstacles is also important, as is the appearance of the environment and the confidence that the intent and identity of other people can be recognized.

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