Cotton is classed for grade, staple, and micronaire to arrive at a description of its quality in terms of the official cotton standards Lighting conditions. -Since the determination of grade is by visual inspection,lighting conditions are very important if uniformity of classification is to be maintained. Lighting not only should be uniform and constant, but any artificial lighting used should provide color rendering equal to that of daylight. Until 1940, practically all cotton classification was done in daylight, often under north skylights because they provided the steadiest illumination for the greast etnumber of hours. Since the color of a light-to-moderately overcast north sky has been found in practice Cotton is classed for grade, staple, and micronaire to arrive at a description of its quality in terms of the official cotton standards Lighting conditions. -Since the determination of grade is by visual inspection, lighting conditions are very important if uniformity of classification is to be maintained. light not only should be uniform and constant, but any artificial lighting used should provide color rendering equal to that of daylight. Until 1940, practically all cotton classification was done in daylight, often under north skylights because they provide the steadiest illumination for the greast etnumber of hours. Since the color of a light-to-moderately overcast north sky has been found in practice