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Lamps and Ballasts
Luminaires and Their Functions
18 other sections not shown
aiming angle aiming line aiming point aisle ambient arc tube average ballast beam spread brightness calculated camera candela value cavity ratios ceiling Chap chart coefficient of utilization contribution crest factor determine diffuse feet Figure floodlight floor cavity footcandles formula graph high-intensity discharge High-pressure sodium horizontal distance HPS lamp Illuminating Engineering Society illumination level industrial initial lamp lumens inverse-square law isoillumination diagrams level of illumination light level light output light source light-loss factor Lighting Design lighting system LS-NC rating lumi luminaire spacing luminous flux luminous intensity manufacturers maximum candlepower metal halide lamps meters mounting height Multiply nadir naire National Electrical Code noise criterion number of luminaires operating percent photometric data plane pole height produce recommended reflected reflector room cavity S/MH ratio sample problem shown in Fig Society of North stacks symmetrical Table task tion uniformity vertical angle voltage wall wattage watts width zone