What is the connection between color rendering index and color temperature?

The colorimeter generally uses photoelectric integration to measure color, such as CS-200 and CS-210, which cannot accurately measure the spectral information of color, but it is still very accurate for the difference between the two samples, that is, the color difference. Therefore, the colorimeter mainly looks at the color difference value (DE), which is used for quality inspection to see if it is within the acceptable tolerance. If you want to measure the specific spectrum of color, you have to use a spectrometer (CS-600, CS-610, etc.), which can accurately measure the LAB, LCH, DE, TRANSMITTANCE, REFLECTANCE and other parameters of the sample.

There is no necessary correlation between the color rendering index and the color temperature. Color temperature is the color of the light that is used to illuminate the source. For example, incandescent light is white and yellow, and the color temperature is about 2850K, which is a low color temperature.

The light color of white is 4000k, and the white of 6500k has some blue in it. The sun, from morning to noon and then to evening, has a color rendering index of 100. The color rendering index is the reflected light from a light source shining on a certain color (seen by the human eye) compared to the reflected light of the color on the sunlight of the same color temperature (seen by the human eye).

If it is the same, the color rendering index is 100, and the difference is large, the color rendering index is small. The method of checking the color rendering index is to first measure its spectrum and then calculate it (using a program).

Color temperature is a unit of measurement that indicates the color components contained in light. Theoretically, the blackbody temperature refers to the color of the absolute blackbody after it is heated from absolute zero (273). After being heated, the black body gradually turns from black to red, yellow, white, and finally emits blue light.

When heated to a certain temperature, the spectral component of the light emitted by a black body is called the color temperature at this temperature, and the unit of measurement is "k" (Kelvin).

If the light emitted by a light source contains the same spectral composition as the light emitted by a blackbody at a certain temperature, it is called a certain K color temperature. For example, the color of the light emitted by a 100W bulb is the same as the color of the absolute blackbody at 2527, then the color temperature of the light emitted by this bulb is: (2527+273)k=2800k.

Color temperature is a unit of measurement that indicates the color components contained in light.

Theoretically, color temperature refers to the absolute blackbody from absolute zero.

a. 273) The color that appears when it is heated.

After being heated, the black body gradually turns from black to red, yellow, white, and finally emits blue light. When heated to a certain temperature, the spectral component of the light emitted by a black body is called the color temperature at this temperature, and the unit of measurement is "k" (Kelvin).

2) If the light emitted by a certain light source contains the same spectral composition as the light emitted by a black body at a certain temperature, that is, it is called a certain k color temperature, such as the color of the light emitted by a 100 W bulb is the same as the color of the absolute black body at 2527K, then the color temperature of the light emitted by this light bulb is: 2527k + 273K = 2800K.

Color temperature is a temperature measurement commonly used in physics and astronomy, a concept based on a fictional black object that emits different colors of light when heated to different temperatures, and its objects appear to be different colors. It's like heating a block of iron.

, the iron first turns red, then yellow, and finally white.

The color temperature of the light source is different, and the feeling is different. Under the illumination of a high color temperature light source, if the brightness is not high, it will give people a cold feeling; Under the illumination of a low color temperature light source, too high brightness will give people a stuffy feeling. The lower the color temperature, the warmer the hue (reddish); The higher the color temperature, the cooler the hue (bluish).

The Kelvin temperature at which a hot blackbody radiator matches the color of a light source is the color temperature of that light source, which is directly related to Planck's blackbody radiation law.

Connection. Color contrast: using two light sources with a large color difference in the same space, the contrast will have a hierarchical effect, when the light color contrast is large, the brightness level can be obtained at the same time, and the light color level can be obtained.

LED lighting.

Generally, there are two kinds of cold white light, warm white light, and the color temperature of cold white light is 4000K-8000K, and the higher the color temperature. The whiter the light color, the ordinary light is cool white light, the color temperature is about 5500K, the warm white light color temperature is 2500K-4500K, and the lower the color temperature, the more yellow the light color. Such as household incandescent light bulbs.

That is, warm white light, the color temperature is about 3000K.

Color temperature is the characterization of the color quality of the light source. The color quality of the light source, that is, to understand the hue tendency of a light source.

Color saturation. Technically, we use color temperature (k) to represent the color quality of a light source. For color temperature and color quality of the light source, yes.

It is believed that the higher the color temperature, the cooler the light, and the lower the color temperature, the warmer the light. The International Illumination Association has developed three types of color tests.

With a temperature of 6500 K, this light source is most widely used because its radiant energy distribution is very similar to that of typical average daylight. Because daylight varies with the climate.

The color temperature of the light source varies between 5500 and 7500 K. Many monitors offer a choice of color temperatures, with a single 5600K

6500k、9300k。Many people are used to choosing a color temperature of 9300k or 6500k.

Isoenergetic light source E is an ideal light source with a completely uniform radiant energy distribution, with a correlated color temperature of only 5400 K, which is equivalent to direct light.

Sunlight is still a warm white light. According to the color perception of the human eye, the ideal white is cold, that is, the white with a higher color temperature.

Light. The white color of the Sony monitor is cold, so it feels like the colors are very vivid and suitable for the human eye. The role of the fluorescent brightener is:

By adding a small amount of blue pigment to the paint, the feeling of cold and white is enhanced. The following are the relevant parameters for standard light sources and daylight.

Standard D656500K

Direct sunlight. 5330k

Cloudy daylight. 6500k

45° elevation angle north sky.

10000k

Isoenergetic light source E5400K

After the object is heated, the object takes on a certain color at a certain temperature. The temperature of the object corresponding to this color is the color temperature.