Lamps are home appliances that every family buys. With the development of technology, in addition to the basic functions of lighting, lamps have gradually appeared in various intelligent products such as dimmable color temperature and human body induction.
Light, whether for lighting or to create an atmosphere, always depends on the human eye to feel, unsuitable light, unqualified lighting, the lighting effect will be greatly reduced, and may even hurt people's eyes. Therefore, we have to know some common sense when purchasing lamps.
Today we talk about the color rendering index. If the color rendering index is too low, it will affect the judgment of the human eye on the color of the object. Over time, it will cause various vision problems.
Before we get to know the color rendering index, let's first understand how the color of matter is produced.
We usually see the color of the substance. In fact, after the sun shines on the surface of the material, part of the light is absorbed, and some of the light is reflected back. The color reflected back is the color we see. If it is absorbed, it is seen. Black; if you don't absorb it, you see white.
Figure: Daylight spectral distribution
The color rendering index is an important method to evaluate the ability of an artificial light source to restore the color of an object. Specifically, it refers to the degree to which an object is compared with a standard light source.
The color rendering index is available in 15 colors, including:
R1: light gray red;
R2: dark grayish yellow;
R3: saturated yellow-green;
R4: medium yellow green;
R5: light blue-green;
R6: light blue;
R7: pale purple blue;
R8: light reddish purple;
R9: saturated red;
R10: saturated yellow;
R11: saturated green;
R12: saturated blue;
R13: Caucasian skin color;
R14: leaves green;
R15: Yellow skin color.
Take the average of the color rendering index of the first 8 common colors, denoted as Ra, and the value represents the color rendering of the light source, up to 100.
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