Fluorescent lamps work from the ionization of gases confined within them. Upon returning to the initial state, the gases emit light.
Currently, fluorescent lamps have been replaced by LED ( Light Emitter Diode ) lamps , which are made of semiconductor material and release light when subjected to a certain voltage. LED lamps have a lifespan of up to 50,000 hours against 5000 hours for fluorescent lamps and 1000 hours for incandescent lamps.
The radiation emitted by photons can be visible or not being in the condition of ultraviolet radiation . If the emitted radiation is ultraviolet, it will be absorbed by the inner lining of the glass tube, which will transform it into visible radiation.