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Lighting Metrics Calculations
Radiant Energy as Waves
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angle arc tube Assume atom average background luminance ballast beam blackbody blackbody radiator bulb calculated candelas cathode ceiling chromaticity CM CM CM color contrast curve daylight diameter distance efficacy electric electron emitted energy equation example Figure filament floodlight fluorescent lamps footcandles given glare glass horizontal illuminance IESNA Illuminating Engineering Society incandescent lamp increases initial lumens intensity distribution lamp lumens lens lm/W louvers lumen method lumen output lumens lumi luminaire luminous efficacy luminous exitance luminous flux maximum mercury metal halide metal halide lamps minutes of arc obtained optical perfectly diffusing photon photopic vision plane polarized produced radiation rays reflectance reflector refraction roadway Sect shown in Fig simple payback skylight Society of North space spectral square surface Table temperature tungsten types values vertical visible visual performance visual tasks voltage wall wattage watts wave wavelength window