Discomfort glare has been investigated for more than a century using various experimental methods. Most of them were based on psychophysical procedures and few others relied on physiological measurements as indicators of it. In this paper, we compare some of these methods to determine the most relevant ones to investigate discomfort glare in an indoor environment. With the same experimental set-up, two experiments were led. In the first one, 35 subjects evaluated two glare sources with different spectral power distribution with seven different psychophysical procedures. In the second one, four physiological measurements were recorded for eight subjects while they were illuminated by the same light sources. Based on the repeatability, the limits and the potential biases of each procedure, three psychophysical methods are recommended to evaluate discomfort glare at photopic levels in an indoor lighting environment. None of the tested physiological measurements produced relevant information about the potential discomfort glare perceived in such environment.

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