Car lights, the most common car accessories. Even bicycles have lights. The most important function is of course to allow you to see the road clearly at night so as to avoid traffic accidents. Today, let’s talk about the main light source of car headlights. Now, with the advancement of technology, LED light sources, which were still very luxurious two years ago, have gradually entered the automotive market. Especially the taillights of vehicles, from brake lights to width lights and reversing lights, most use LED light sources. The previous halogen bulbs have similar principles to our common tungsten lamps, and have begun to be gradually introduced to the market. The lights on the rear of the vehicle are entirely for other vehicles to detect at night, and mainly serve as a warning. The front lights improve your driving safety at night.
Halogen light source
Halogen light source is one of the most common car light sources. Evolved from ordinary incandescent lamps. The principle is to inject halogen gas such as iodine or bromine into the bulb. At high temperature, the sublimated tungsten wire reacts chemically with the halogen. The cooled tungsten will re-solidify on the tungsten wire, forming a balanced cycle to avoid premature breakage of the tungsten wire. . Halogen bulbs therefore last longer than incandescent bulbs.
Lighting principle: The halogen lamp used in vehicle headlights has halogen gas injected into the lamp body, similar to dielectric gases such as iodine and bromine. Since the tungsten wire will sublimate at high temperatures, the halogen gas will At this time, there will be a certain chemical reaction with the sublimated tungsten. The tungsten wire that has become a gas will re-solidify on the original tungsten wire and can continue to be used. This is similar to the energy balance effect and extends the service life of the car lights for a certain period of time. of extension.
Features: The structure is simple, the manufacturing cost is low, the low beam brightness is acceptable, the light is soft and uniform, the high beam brightness is poor, and because the light is yellowish, the penetration effect in rainy and foggy weather is good. However, the overall low brightness and short service life are the biggest disadvantages of halogen light source headlights. If you are unlucky, the light bulb will burn out frequently.
Xenon light source
Xenon lamp (High Intensity Discharge) refers to a high-pressure gas discharge lamp that is filled with a mixture of inert gases including xenon, and does not have the filament of a halogen lamp. It is referred to as HID xenon lamp, which can be called metal halide lamp or xenon lamp. Its lighting principle is to increase the voltage to more than 23000V through a starter and an electronic ballast, and the high voltage breaks down the xenon gas, causing the xenon gas to form an arc between two electrodes and emit light.
Lighting principle: Xenon lamps are also called HID gas discharge headlamps in the field of automotive lamps. It uses high-pressure xenon gas wrapped in a quartz tube to replace the traditional tungsten wire, providing higher color temperature and more concentrated lighting. Because the xenon lamp uses high-voltage current to activate xenon gas to form a beam of arc light, it can continuously discharge and emit light between two electrodes.
Features: The power of ordinary car tungsten filament bulbs reaches 55 watts, while xenon lamps only require 35 watts, which is nearly half the power. Xenon lamps can significantly reduce the burden on the vehicle's electrical system. The color temperature of automobile xenon lamps is between 4000K and 6000K, which is much higher than ordinary car headlight bulbs. It has high brightness. The light color of 4300K xenon lamp is white and yellowish. Due to the low color temperature, the visual effect is yellowish. The penetrating power of the light is stronger than that of lamps with high color temperature, which can improve driving safety at night and in heavy fog.
LED light source
LED was first known mostly on mobile phones, computers, and TV screens. When LEDs first began to become popular, electronic devices carrying this technology were not cheap. LED light sources are gradually becoming popular in offices, homes, and other places where lighting is used due to their energy saving, long service life, and soft and non-dazzling light. At present, it has begun to be used on some high-end models, and auxiliary lights are widely used in SUV models.
Principle: LED is an abbreviation, and its full name is Light Emitting Diode. This thing is translated as "light emitting diode". This is a solid-state semiconductor device whose ability is to convert electrical energy directly into visible light. Depending on the material of the inorganic semiconductor, the color of the visible light emitted is also different.
Features: Compared with incandescent bulbs and halogen lamps, the working voltage is very low (some are only a few volts); the working current is very small (some are only a few tenths of a milliamp to emit light); they are impact-resistant and It has good earthquake resistance, high reliability and long life; by modulating the intensity of the passing current, the intensity of the light emission can be easily modulated. Therefore, in ordinary models, LED light sources will not be selected as headlight sources. Instead, it is more used on daytime running lights.
To sum up, halogen headlights are actually enough for vehicles. Many people think that the halogen light source is not bright enough at night, which is determined by its color temperature. Halogen lamps also have ultra-white light bulbs, which can be solved by replacing the bulbs. The second is xenon lamps. Many friends like to change their car lights to xenon lamps, but they are worried about the problem of vehicle inspection. If the vehicle you buy has a xenon lamp of the same model, you can modify it and the vehicle inspection will not be affected. However, whether it is xenon lamp or halogen ultra-white light, in fact, if you drive for a long time at night, it is easy for the driver to feel fatigued because the light is too hard. LEDs are now sold by many manufacturers and are also used in some high-end models. However, LED itself does have a long life, but product heat dissipation is a problem. If it is some low-end products, the lifespan will be greatly reduced, and it may not even be as long as the life of halogen lamps. Therefore, be sure to look for products produced by major manufacturers.
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