Blue light has a short wavelength and a high frequency, which means it has a higher energy level than other colors of light. The temperature of a color is how "hot" it looks, and is measured in Kelvin. The higher the Kelvin temperature, the hotter the color appears.

Blue light has a temperature of around 9,000 to 12,000 Kelvin, which is a very high temperature. In comparison, the sun has a temperature of about 5,778 Kelvin, which makes it appear yellow-white in color.

The color temperature of a light source is an important factor to consider when choosing lighting for different applications. For example, blue light is often used in commercial settings because it can make products appear more vibrant and appealing. However, blue light can also be disruptive to sleep, so it should not be used in bedrooms or other areas where relaxation is important.