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angle application arc tube ballast beam calculations Calif candlepower ceiling cent Chairman Chicago Cleveland Coefficient color Committee Corp curve dekalux diffuse downlights effect efficiency Electric factors feet field Figure fixtures floodlights fluorescent lamps footcandles footlamberts glare glass halogen lamps Holophane Hotel Illuminating Engineering Society illumination levels incandescent incandescent lamps industry installation light sources lighting design lighting system located lumen lumi luminaires luminance Luminance Coefficients Manufacturing measurements ment mercury lamps metal halide lamps meters mounting height Nela Park Ohio operation outdoor P. O. Box panel paper photometric plastic poles Power ratio Reader Information Card recommended reflectance reflector Region Research saccadic Section sodium specular standard surface Sylvania Sylvania Electric Products Table TASK PLANE television temperature tion tube units values vertical vice president visibility visual voltage wall watts York