## Light Calculations and Measurements: An Introduction to the System of Quantities and Units in Light-technology, and to Photometry |

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absorption average luminous axis bulb calculated candela candle cell centre coil colour comparison computed constant denoted determined diffuse reflection direction distance electric emittance employed equal equation exit pupil expressed flashed formula gas discharge lamps glass half-apex angle hence horizontal illumination illumination produced incidence inverse square law isolux diagram Lambert's law layer lens lenses light distribution curve light source lighting fitting lines lumens luminance factor luminosity luminous efficiency luminous emittance luminous flux luminous flux emitted luminous intensity means measurement meter method mirror multiplied objective observed obtained optical system perpendicular photometer photometry plane H plotted point source projection quantity of light radius ratio rays reflection factor refraction relative luminous represented Rousseau diagram screen seen shown in Fig sinusoidal projection solid angle spectral sphere spherical standard steradian subtended symmetrical temperature uniformly diffuse unit of luminous vertical voltage wavelength