Estimation of Discomfort Glare Rating for Automotive Red LED Lamps

To examine the quantitative relationship between the degree of discomfort glare and a number of photometric quantities, experiments were conducted using red LED lamps for automotive lighting devices. Illuminance at the observer’s eye and effective glare luminance proposed by Tashiro et al. were employed as photometric quantities. The results show that the illuminance at the observer’s eye denotes the same tendency as the results of previous study. However, the results of effective glare luminance show different trends. Using a discomfort glare evaluation formula with effective glare luminance, the results of this study and Tashiro’s study were compared. The results showed a strong correlation between the evaluation and estimation values of discomfort glare. This means that the discomfort glare rating for any LED sources can be satisfactorily estimated.