Recently, I suddenly realized one thing. We often talk about lighting, but we never talked to our partners about what some of the human body can’t touch in a lamp. It will be shared with everyone from time to time. Some little knowledge about lamps. Today, let's talk about coloring. Before we talk about color rendering, let's talk about a few life scenes that everyone will encounter. 
The following two sets of iron plates, which one do you want to eat?
When you try on it in the clothing store, the skirt is obviously purple on the left. When you go home, you find that the skirt is spicy on the right! Wrath! Bad review!
The fruit seen in the supermarket is so mouth-watering on the left, but the fruit seen at the roadside booth is not like this.
Everyone should be able to observe that under the different light sources, the same plate of iron plates, the same skirt, the same fruit, the color is very different! This involves the color rendering of the light source!
What is the color rendering of a light source?
The color rendering of a light source refers to the degree to which the light source is rendered to the natural primary color of the object. That is, the degree of color fidelity, usually called the "color rendering index" (Ra). Color rendering is divided into two categories: "faithful color rendering" and "effect color rendering". What we usually say is faithful color development.
The International Commission on Illumination (CIE) sets the color rendering index of sunlight to 100 and specifies 15 test colors. R1-R15 respectively indicate the display indices of the 15 colors. When comparing a light source to a specified reference source, an index value of 100 is preferred.
What is the ghost of R1-R15?
So many colors! What is the meaning? In fact, each light source has a relatively sensitive color. For example, if a certain light source is sensitive to red, then under its illumination, the color displayed by the red object will be more realistic, but objects of other colors. Under its illumination, it does not necessarily achieve a very realistic color reproduction.
Professionally speaking, the evaluation of the color rendering quality of the light source is mainly considering its natural color to R1-R8, R9-R15
7 test colors, a total of 15 colors of reduction level, and we usually say that Ra refers to the source pair R1-R8
The average of the eight natural color reduction levels, R9-R15 is not counted.
We usually see that the luminaire manufacturer will write a similar indication method such as Ra>90 (R9>50) when marking the product, and Ra>90 indicates the color rendering of the luminaire for R1-R8.
The 8 natural colors are highly restored, and R9>50 indicates that the luminaire has a good color reproduction ability for red objects.
How to choose lamps for the color of the item?
Choosing the appropriate lighting source is mainly determined by the color of the object being illuminated. For example, in the three comparison charts at the beginning of the article, the iron string string on the left uses a light source with a higher R9 color rendering index, so it looks more Glossy and delicious; the red skirt on the left is also a light source with a higher R9 color rendering index, so it looks brighter and brighter; while the fruit on the left side of the supermarket has a good color rendering index due to the light source Ra, so it looks more mouth watering.
For the lighting source of the meat window of supermarkets and shops, the R9 color rendering index is particularly important; for scenes where studios, studios, etc. need to reproduce the skin color, the R15 index of the lighting source must not be low; museums, galleries Such places require a highly realistic reduction of all colors, and the requirements for the Ra and R1-R15 indices are more stringent.
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