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Foreground Illumination from Headlamps: Effects on Visual Performance and Preference

This study evaluated foreground light level and uniformity created by headlights. It presented varying levels of illumination and uniformity to human subjects and tested their abilities to detect targets on the road, both in the immediate foreground and also further away. The subjects preferred high lighting levels in the foreground, even though the lighting was not necessarily uniform. However, their target detection rate was slightly lower with higher foreground illumination levels, even though they felt that the lighting quality was improved with greater foreground illumination.