The flux of received in a unit area of a certain side being shown is popularly known as illumination. The measuring unit in both United Kingdom and America is known as footcandles light, but in Europe it is also known as meter candlelight. One foot-candles is the illumination of that falls on one side which is one foot away from a one foot-candleand exactly intersecting with the light. Its abbreviated form is written as 1 Fc=1 Lm/ft, similarly, one-meter candleis the illumination of that falls on a side which is one meter away from a one meter candleand exactly intersecting the light.
It is also called Lux i, e. the flux of being received in each square meter is called the illumination of one Lumen.