Simulators of CIE Illuminants D65 and D75 are widely used for visually judging colors, but D50 simulators are used in photography and color printing. The CIE method of assessing the quality of daylight simulators provides sets of virtual metamers for assessing D55, D65, D75 simulators, but does not provide them for D50. Data specifying sets of metamers for assessing the quality of D50 simulators are presented. They are based in part on data in a Japanese standard and in part on newly derived data.