experimentally show the luminous intencity.

The concept of luminous intensity is very easy, there is no as such experimental description required, have a look at the content given below: 

Luminous intensity is the ability to emit light into a given direction, or it is the luminous flux that is radiated by the light source in a given direction within the unit of the spatial angel. 

The luminous flux per unit solid angle (per steradian), as measured in a given direction relative to a light source. Its unit is the candela.