Candela
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Candela is the SI unit of luminous intensity. It measures the luminous power per unit solid angle emitted in a particular direction. A common wax candle has a luminous intensity of roughly 1 cd.
1=radiating tube of thorium dioxide; 2=melting pot; 3=solidifying platinum
Lux
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The lux is the unit of illuminance, or luminous flux per unit area, in the International System of Units. It is equal to one lumen per square metre. In photometry, this is used as a measure of the irr
Candela
…L−2⋅J Luminous flux per unit solid angle per unit projected source area. The candela per square metre is sometimes called the nit. Illuminance Ev lux (= lumen per square metre) lx (= lm/m2) L−2⋅J Luminous flux incident on a surface Luminous exitance, luminous emittance Mv lumen per square metre lm/m2…
A lux meter for measuring illuminance