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amount axis brightness burner candle-power candles carbon cent Chapter colour comparison lamp daylight factor diagram disc discharge lamp distance efficiency electric lamp energy distribution curve equal filament lamp flame flicker fluorescent fluorescent lamp flux emitted foot-candle foot-lambert ft-L gas mantle give given glare horizontal illuminating engineering iso-candle light distribution light source lighting fitting lighting unit low-pressure lumens lumens per square luminous flux luminous intensity mantle material measured method mixture mounting height object obtained perfect diffuser photocell photometer head plane polar curve pressure prisms produced proportional radiant energy radiation reflection factor reflector sensitive shown in Fig solid angle source of light spacing-height ratio spectral distribution spectral energy distribution specular reflection sphere standard steradians street lighting supply surface temperature test plate transmission factor tube tungsten tungsten filament usually value of illumination vertical visible spectrum visual voltage wave-length window