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Luminous Flux Luminous Intensity Quantity
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average axis calculation candela candle cell colour computed conical surfaces constant deﬁned deﬁnition denoted determined diffuse reﬂection diﬂuse direction distance efﬁciency emittance employed equal equation exit pupil ﬁgure ﬁlament lamps ﬁlm ﬁlter ﬁnite ﬁrst ﬁxed ﬂashed foot-candle formula gas discharge lamps glass half-apex angle hence horizontal illumination illuminating engineering illumination produced illumination values incandescent inﬁnitely inverse square law isocandela isolux diagram lens light distribution curve lighting ﬁtting lumen luminance factor luminosity luminous emittance luminous ﬂux luminous intensity measurement meridians method mirror multiplied objective observer obtained parallel perpendicular photometer photometer ﬁeld photometry plotted point source projection projector quantity of light radiation radius ratio rays reﬂecting surface reﬂection factor Rousseau diagram scotopic vision screen shown in Fig sinusoidal projection solid angle spectral sphere standard steradian stilb sufﬁciently symmetrical uniformly diffuse unit of luminous vertical voltage wavelength X-system