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30 footcandles amount of light angle areas average ballast beam Bipin brightness ratios bulb candlepower distribution curve cent CHECKBACK cleaning coefficient of utilization color comfort continuous rows contrast cool white cost crosswise Data Section desk diffuse DIFFUSE REFLECTION direct glare efficiency equipment example eyes Figure filament fixtures required floor fluorescent fixtures fluorescent lamps footcandle level footlamberts give glass high-bay incandescent lamps indirect industrial lighting installation layout lengthwise lens light meter light output light source lighting fixtures Lighting units louvers low brightness lower lumen output machine maintenance factor MATTE SURFACE maximum spacing Medium mercury lamps Mogul mounting height number of fixtures operation produce Projector Lamps reading Reading F.C. reduce reflected glare reflector retina room ratio shadows shielding shown in Fig slimline specular reflection spot standard candle Step supplementary lighting surface switch Table B-2 task tion troffers two-lamp type of fixture upward light usually vision WATT wattage wavelengths workers