Perception study of discomfort glare from LED road lighting

In: ISSN:0236-2945

Abstract

The fast development of LED technology enables its quick penetration into general lighting applications. Especially in China, LED is introduced in road lighting at a high pace due to strong governmental support. However, there is a rising concern about discomfort glare caused by LED road luminaires. Therefore, we conducted a perception experiment to evaluate how LED sources with different Correlated Colour Temperature (CCT) and luminance level influenced people's perception of discomfort glare. Both subjective ratings and people's pupil diameters were measured for both young and old people at two different angles between the line of sight and the luminaire. The results show that a LED source with a CCT of 3 000 K is perceived less glary than one with a CCT of 6 000 K. Therefore, LED source with lower CCT is preferred for reducing discomfort glare.