This section provides overview, applications, and principles of halogen lamps. Also, please take a look at the list of 13 halogen lamp manufacturers and their company rankings.
Halogen lamps, as the name implies, are halogen-type light bulbs, a type of lamp that emits light using halogen gas. Halogen lamps are characterized by a longer life than ordinary incandescent lamps due to the use of halogen gas.
Halogen lamps emit light through the same mechanism as incandescent lamps: electricity is passed through a filament inside the bulb. A filament is a fine thread-like wire which is the heating element used in light bulbs. Generally, a material called tungsten is used for the filament.
Halogen lamps are generally used for household lighting.
Although LEDs, which last longer than halogen lamps, are becoming more common these days, it is difficult to accurately reproduce the light of halogen lamps using LEDs, so they are still used in commercial facilities, tenants, grocery stores, and showrooms.
Halogen bulbs are also used outside of the home in car headlights. However, these, too, have recently been replaced by LED lights.
Halogen lamps have a principle similar to that of incandescent lamps. Incandescent lamps are issued to light by heating a tungsten filament to a high temperature. The high temperature causes the filament to evaporate and adhere to the glass tube, causing the glass to darken, a phenomenon known as blackening. When blackening occurs, the luminous efficiency of the bulb decreases, and its function as a light bulb deteriorates.
To suppress this blackening phenomenon, halogen lamps contain trace amounts of halogen elements along with inert gas in the bulb. If the temperature and material conditions are appropriate, a chemical cycle called the halogen cycle occurs in the lamp, and the blackening phenomenon is eliminated.
The mechanism is that tungsten atoms evaporated from the filament float in the inactivating gas and compound with halogen atoms to form tungsten halide. Tungsten halide is a substance that evaporates easily, and when this gaseous tungsten halide approaches the filament, it rises to a high temperature and separates into halogen atoms and tungsten atoms. The separated tungsten atoms then adhere to the filament again, creating a cyclical state.
*Including some distributors, etc.
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