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This is great invention indeed, which changed functioning of mankind on this earth.
It is simply an assumption that if the filament gets heated it converts electrical energy into light energy.
PROCESS OF LIGHT:01 It is true that energy is of object oriented.
02 As objects are removed from the bulb, concentration/boost of energy inside bulb is not possible.
03 For the energy in the open area, electric bulb is an important object.
04 Even before supply of electricity to the filament, there is heavy concentration of energy against bulb.