Define each of following terms of illumination — lux, lumen, luminous flux, illumination.

Define each of following terms of illumination — lux, lumen, luminous flux, illumination.
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1 Answer

Answer :

i) Lux :- It is unit of illumination and it is defined as luminous flux falling per unit area 


ii) Lumen: It is defined as the luminous flux emitted by a source of one candle power per unit solid angle in all directions 

OR 

It is unit of luminous flux. One lumen is defined as luminous flux emitted per unit solid angle from a point source of candle power. 


iii) Luminous flux (F):- The total energy radiated by a source of light in all directions is called Luminous flux. And its unit is Lumen OR Luminous flux is commonly called light output and is measured in lumens (lm). 


iv) Illumination:- The illumination is defined as the luminous flux falling on per unit area of the given surface on the working plane. The unit of illumination is lumens/m2 OR lumens/m2 = 1 Lux

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