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The SI unit of luminous intensity (luminosity) is thecandela (CD).

illuminance: pH = phot = CD·sr·cm-2 (= 104 lx)

luminance: L = Lambert = CD·cm-2 (= 104 lx)

luminous emission: sb = stilb = CD·cm-2 (= 104 CD·m-2)

quantity of light: lumerg = CD·sr·s (= 1 lm·s)

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