Target detection distances under different road lighting intensities

European Transport Research Review

An Open Access Journal

Table 1 Characteristics and dimming information of the luminaires with different percentages of luminous flux

*CCT is correlated colour Temperature^a, Ra is colour-rendering index^b
^aCorrelated Colour temperature (CCT) defined by CIE is “the temperature of the Planckian radiator whose perceived colour most closely resembles that of a given stimulus at the same brightness and under specified viewing conditions”. a description of the warmth or coldness of a light source the unit of CCT is Kelvin. The lower colour temperature refers to warmer and reddish colour of light and the higher colour temperature refers to the cooler and more bluish colour of light
^bColour rendering index is the ability of a light source to accurately render all frequencies of its colour spectrum when compared to a perfect reference light of a similar type. It is rated on a scale from 1 to 100. The lower the CRI rating, the less accurately colours will be reproduced