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Simple diffuse lightsources
The law of reciprocity
11 other sections not shown
ABLK approximation assume average illumination axis basic formulae calculations ceiling centre chapter chart co-ordinate combinations curves cylindrical emitter daylight factor derived diagram diffuse light-source dimensions direction distance divided dxdy dydy Emitter L h employed equal expression figure floor fluorescent lamp flux field flux tubes further gives glass horizontal illuminated area illuminated surface illuminating engineering illumination values infinitely integration intersection inverse square law KLMN Lambert Lambert's law lamps law of reciprocity length light lines of measurement luminous flux emitted luminous flux received luminous intensity luminous radiance measuring plane measuring point method narrow strip obtained P-chart parallel parallelopiped perpendicular plane element plane Universal point of measurement point Universal problems produced projection quadrants rectangle reflector relating respect result shown in Fig sky factor solid angle steradians stilb substitute plane symmetrical tion Variation vertical walls whilst width window zero