9 LUMINARIES; LIGHTING FIXTURES HAVING THE TRANSMISSION CHARACTERISTICS OF THE SPECTRAL QUALITY OF NATURAL DAYLIGHT; PHOTOMETERS; TRANSMISSION AND REFLECTION DENSITOMETERS; COLOR MEASURING EQUIPMENT SUCH AS COMPUTERS DETERMINING THE CONSTITUENTS OF MIXTURES; COLOR CHARTS BASED ON DISSECTIONS OF THE COLOR CUBE FOR USE IN CALCULATING THE MIXTURE OF COLORANTS NECESSARY TO ARRIVE AT THE COLOR REPRESENTED BY THE CHART