Color Temperature (color temperature / Kelvin) is a technical term that is extremely important in rendering and optimizing game graphics (technical art). This is an index that compares the color of light to physical absolute temperature (unit: K/Kelvin), and explains the elements that control the emotional atmosphere of light, from low temperature (orange light bulb light) to high temperature (bluish sky light).
An analogy in the real world: When an iron rod is heated, if the temperature is low, it becomes ``vaguely red'' (low-temperature light bulb light), as the temperature rises, it becomes ``yellow (sunlight)'', and when it becomes extremely high temperature, it ``glows blue-white (high-temperature light)'' - a physical thermal change in light
Stop choosing colors from the color picker based solely on your sensibilities, and instead set them according to a physical yardstick called "light temperature (Kelvin)." Lights with a low temperature (e.g. 2000K) emit the warm orange of a candle, and lights with a high temperature (e.g. 8000K) emit the blue of a cold, cloudy winter sky, so even when multiple different lights are mixed, a smooth "excellent light harmony" exactly like the real world is automatically completed.
Figure: An infographic that clearly illustrates the basic processing flow and mechanism of Color Temperature (color temperature / Kelvin) in Japanese notation
Detailed mechanism and operating principle
Enable "Use Color Temperature" in Unity's Light component and enter a "Kelvin value" such as 3000K for a light bulb or 6500K for sunlight to automatically generate the physically correct color of light.