The Filament in a light bulb is made of a long incredibly thin metal named tungsten because of its high melting temperature of about 3695k, high resistance, low vapour pressure and greatest tensile strength. In a typical fluorescent light bulb of 60 wattage, the filament of tungsten metal is about 6.5 feet (i.e 2 meters) long but is of only one-hundredth(1/100) of an inch thick.
The tungsten is arranged in a double coil in order to fit all of it in a small space inside sealed glass of the light bulb containing inert gases like argon and nitrogen or vacuum to prevent the filament from vaporization at high temperature. A typical fluorescent light bulb has efficiency of only 10% means that 90% of electrical energy is wasted to produce heat and only 10% is used to produce light.
Conclusion
Hope, you have clearly understand what is the filament of fluorescent light bulb made of. Make sure to leave your opinion about this post in the comment section below.