Light knowledge

Light knowledge
▏Color temperature（CCT)▕
Color temperature (unit: K) is the color change that the human eye can perceive under different energies of light waves. Take the flame as an example. The central flame with the highest temperature is blue, the middle is yellow and white, and the outer flame with the lowest temperature is orange-red. It can be seen that the colors corresponding to the low color temperature to the high color temperature are orange-red, white, and blue.
The light with a high color temperature is bluish and has a refreshing feeling. The color temperature of the deep blue sky can reach 20000k.
The light with low color temperature tends to be reddish, and the color temperature at dusk is generally below 3000k. Lights of different color temperatures will be used in the lighting to give people different feelings.
▏Color rendering （CRI)▕
Color rendering (Ra) refers to the degree of color reproduction of an object under a light source, the highest color rendering under the sun, which is 100Ra. A light source with a more complete spectrum has better color rendering: among artificial light, incandescent light has the best color rendering, while energy-saving lamps have poor color rendering.
When you have drawing, design, and other needs, the color reproduction degree of the light source is best to be above 80Ra.

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