The color of automobile halogen lamp is yellow. The basic principle of halogen lamp is to introduce halogen bulb steam, such as iodine or bromine, into the bulb. At the continuous high temperature, the lifted tungsten wire reacts with the halogen bulb to emit white light. The tungsten wire of halogen lamp is tungsten wire, and the cooled tungsten will condense on the tungsten wire again, resulting in a balanced circulation system to prevent the tungsten wire from breaking prematurely. Therefore, the service life of halogen lamps is longer than that of ordinary fluorescent lamps.

The color of automobile halogen lamp is related to the color temperature. The color temperature of headlights is the color of light emitted by electric bulbs. The lower the color temperature, the warmer the color and the redder the light. The higher the color temperature, the colder the color and the whiter the light (color change: black hair red-yellow-white-blue). The color temperature of automobile halogen lamps is generally between 2000 K and 4000 K (K stands for color temperature, which is a scalar of lamp source color), and the color is dark. If the color temperature is too high (> 5000 K), it will show high-definition blue light, such as hernia lamp, but the light penetration of this color temperature is poor, which is more dazzling under air pollution.

Automobile halogen lamps are generally used in ordinary cars, and their chromaticity is low, but they inherit the advantages of traditional fluorescent lamps, such as low cost, easy manipulation and adjustment of chromaticity, good color rendering index, softer light and stronger penetration compared with LED and hernia lamps. This is because the penetrating power is related to the color temperature (K value) of light. Generally speaking, the lower the color temperature, the better the penetrability. Conversely, the higher the color temperature, the worse the penetrability.

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