Why good car LED lights are white?

Why do many good LED lights basically have only cool white light sources to choose from? When referring to the color of LED bulbs, one word must be mentioned: the color temperature of the light source. The color temperature of the light source is determined by comparing other colors with the theoretical thermal blackbody radiation. The light emitted by the thermal radiation source is smooth and continuous, and the color of the black body at different temperatures is different.

After the black body is heated, as the temperature increases, it will show different colors, so the color of the black body corresponds to the temperature. The color of the light source is based on the color of black objects. When the color of the light source is the same as the color of the black body, the current temperature color of the black body can be regarded as the color of the light source. The spectral component of blackbody light is this temperature. At the color temperature, the unit of measurement is K. LED and other lighting fixtures, the color accuracy of the light is not very high.

It can be seen that the color temperature of positive white light is 6000-6500k, which is a common color temperature of LED lights. It has a higher color temperature than the noon sunlight and is close to natural light, giving a bright and clear feeling, making it easier to concentrate. White LEDs are not pure white LEDs, white light is obtained by combination. The common white light comes from the blue LED + yellow phosphor, and the yellow phosphor is evenly coated on the surface of the blue LED. After the blue light emitting diode+yellow phosphor powder is encapsulated, the blue light emitting diode light will excite the yellow phosphor powder above, and the phosphor powder will naturally emit yellow light when excited. At this time, after the yellow light and blue light are complementary mixed, white light will naturally be produced.