Incandescent bulb or so caled filament lamp is a lamp that generates light from an incandescent wire heated to a high temperature of electric current that passes through it. The hot filament is protected from oxidation by the air with a balloon, which is vacuumed and filled with inert gas. The bulb is provided with an electric current through leads or wires, embedded in the glass. Most bulbs are used in nest with the corresponding socket that provides an electrical connection.
Incandescent bulbs are produced in a wide range of sizes, light and voltage - 1.5V up to about 300V. They require no external regulating equipment, have low manufacturing costs and work equally well in an alternating current(AC) and direct current(DC). As a result of these advantages, the incandescent lamp is widely used in household and commercial lighting, for portable lighting such as table lamps, car headlamps, flashlights, as well for decorative and advertising lighting solutions. Incandescent bulbs are less efficient than some more modern types of light bulbs because much of the energy used is converted into heat. But for some applications of the incandescent bulbs, the transferred heat generated by the wire-spiral is used deliberately. These applications include incubators, heating light for tanks of reptiles, infrared heating for industrial heating and drying processes and more.