Fluorescent light is produced by a fluorescent lamp which uses electricity to produce mercury vapor. The mercury atoms generate ultraviolet light. Certain gases are filled in the fluorescent lamps including argon, neon, krypton and xenon. The pressure inside the bulb is kept 0.3 percent of atmospheric pressure. The surface inside the bulb or tube is coated with a fluorescent comprises some rare phosphor and different blends of metallic salts. The electrodes are made up of coils of tungsten. These are generally called cathodes as the function of these coils is to emit electrons. There is mixture of barium, strontium and calcium coated on the cathodes so as to have a low temperature.
The size of the fluorescent light varies depending on the compactness of the area in which they are used. Light emitting paint is applied inside the tube. The tube is heated at high temperature so as to impel the remaining organic compounds. At this high temperature the coating of the phosphors is fused with the glass of the bulb or tube. The mercury arc produces ultraviolet light. To capture this light, the coating is kept thick enough.
These days Fluorescent Lights are used almost everywhere. In normal bulb, light is produced by heating the filament of the bulb. A lot of electric energy is consumed by them. But in fluorescent bulbs or tubes, there is a gas which produces invisible ultraviolet light by electricity. This ultraviolet light is used by the coating inside the bulb to produces more light. Heat is not used in fluorescent bulbs. Instead ultraviolet light produced by the cathodes inside the bulb is used to produce light. Thus the fluorescent bulbs are more fuel efficient than the incandescent bulbs.