The degree to which the light source presents the color of the object is called color rendering, that is, the fidelity of the color. The light source with high color rendering performs better on the color, and the color we see is closer to the natural color. The light source with low color rendering performs poorly on the color, and the color deviation we see is also large.
Why is there a distinction between high and low color performance? The key lies in the spectral characteristics of the light. The wavelength of visible light is in the range of 380nm to 780nm, that is, the range of red, orange, yellow, green, green, blue and purple light we see in the spectrum. If the proportion of each color light contained in the light emitted by the light source is similar to that of natural light, the color seen by our eyes will be more realistic.
We generally take the color rendering index as the characterization of color rendering. Standard color under the radiation of standard light source, the color rendering index is set as 100. When the color code is illuminated by the test light source, the visual distortion of the color is the color rendering index of the light source. The larger the color rendering index is, the less the distortion is. On the contrary, the larger the distortion is, the smaller the color rendering index is. The requirements for color rendering index of light source are different in different places. In the International Lighting Association, the color rendering index is generally divided into five categories:
Category RA scope of application
1A: > 90 art galleries, museums, printing and other industries and places
2B: 80-90 families, restaurants, advanced textile technology and similar industries
2: 60-80 office, school and outdoor street lighting
3: 40-60 heavy industry factory, outdoor street lighting
4: 20-40 outdoor road lighting and some places with low requirements