Halogen headlamps-the most common type since the 1980s and to date the type of motor vehicle headlamps passing and driving beam and front fog and position lamps. Halogen porceles
Halogen porceles
The lamps for these headlamps are used by halogens-chemical elements with strong oxidizing properties (from rowing. halos and genes is the "forming salt"). Generally, iodine and bromine are preferred, which add to gas-fillers inside the lamp.
In normal lamps, tungsten (from it is made of filament) starts to evaporate and then settles on the walls, forming a dark one; the thread is stale and the lamp is burned.
The life of a halogen lamp twice as long as the normal life
In lamps with halogen fillers, there is a chemical reaction: the tungsten and iodine (or bromine) compound is in the process of circulating inside it, and when it reaches a hot thread, it decomposes into the original components. Wolfram partly settles back on the thread, and partly remains in the form of separate molecules around the thread. This slows the further evaporation of the metal during heating, and the surface of the lamp remains transparent.
With high light output, halogen halogens reduce electricity consumption by half and at the same time reduce the amount of gabarrhythmia
Thus, the life of the halogen lamp is twice as long as usual. Besides, these lamps can be heated more than usual, so their light is much brighter and richer-and it stays that way throughout the life cycle. Also at the expense of high light output the halogen lamps allow to reduce the consumption of electricity by half and at the same time reduce the size.
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For car headlamps very compact halogen lamps of sizes MR16 and MR11 are used. They can be high voltage (by 220B) or low voltage (12V), transparent or matted.
A small light bulb shall be placed in the centre of a sealed structure consisting of a reflector, lens and lens (for fog lamps). Halogen headlamps work well both from a variable and a constant current. And they react poorly to the voltage spikes, so the connection system uses a stabilizer.
The continuous spectrum of the halogen lamp is very similar to the daylight. Therefore, in their manufacture, any colour solutions-restrictions apply only to the rules of operation of the vehicle to which the headlamps with such lamps will be installed.
Plus and minus the halogen headlamps
The positive quality of the halogen headlamps-saturated bright light-is the opposite side. As the surface of the bulb is swolled to 500 ° C, halogen headlamps shall be made with thick laminated glass. And still the temperature in the whole headlamp is increasing very much, which may adversely affect the work of the lens and the reflector.
It is necessary to change the failing lamp of such a lamp with the utmost care: it is not possible to touch the glass with hands, because the fat on the skin surface in the future will leave traces; the glass may collapse in this case.
Numerous experiments with lamps for car headlights led to the appearance of xenon and LEDs. But the xenon headlamps are very bright and contain substances harmful to human health, and LEDs are so expensive that they can only afford the owners of luxury cars. Therefore, at present, almost all new machines continue to be equipped with standard halogen headlamps.