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Luminous Flux Luminous Intensity Quantity
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absorption angle of incidence average axis bulb calculation calibration colour comparison lamp comparison surface computed constant cos3 denote determined diameter diaphragm diffuse reflection direction distance effect efficiency of radiation emittance employed equal equation exit pupil filament film gate filter flashed fluorescent lamps formula gas discharge lamps hence horizontal illumination produced incandescent lamp inverse square law isocandela isolux diagram Lambert's law layer lens lenses light source lighting fitting luminance factor luminosity luminous efficiency luminous flux luminous intensity means meter method mirror objective observed obtained optical system parallel perpendicular photometer field photometry plane plate plotted prism projection projector radius ratio rays reflection factor refraction road surface rotated Rousseau diagram scotopic vision screen shown in Fig solid angle spectral sensitivity sphere wall spherical standard temperature transmission factor uniformly diffuse unit values vertical visual voltage wavelength X-system