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Chapter Number Page Foreword
Units of Light Photometry
12 other sections not shown
60 watt amount of light angle approximately arc lamp argon average barn bcard beam blue brightness buildings bulb burned candlepower candles carbon colored light controlled Convenience outlets cost curve dark daylight dces designed desired determined diffusing glass direct display Dome reflectors effect efficiency electrical advertising electrodes enclosing globe factors farm feet filament lamps flasher floodlights foot-candle gas-filled lamps glare heat High Intensity Mercury Illuminating Engineering incandescent lamp inch inside lamp sign light output light source lighting equipment lighting units located lumens per watt luminaires luminous intensity Mazda lamps Mercury Vapor lamp mounting height necessary Necn obtained oolor operating photometer placed produce recommended reflection retina semi-indirect show windows socket sodium vapor lamp spacing street lighting surface switch tube tungsten ultraviolet usually vision visual voltage watt lamps wattage wave-lengths whioh wire