Learn about color assessment cabinet light source knowledge

As we all know, observe the color can not be separated from the observation light box light source, no light no color. The knowledge of physics tells us that visible light is also an electromagnetic wave whose wavelength range is: 3900nm-7600nm (as shown below). Near the wavelength of 3900nm light is purple. Near the 7600nm wavelength of light is red. Less than 3900nm light called UV, the human eye.Generally see no more than 7600nm wavelength of light called infrared, the human eye is generally invisible.
In the visible light between 3900nm and 7600nm, we introduce a physical concept that represents the luminous color of light - the color temperature. The color temperature of the light source is the color that appears when the light source emits light and the color that appears when an absolute blackbody is burned at high temperatures Consistent with the combustion temperature to define, its unit is the absolute temperature Kelvin "K". K value is higher, the color of the light appears more and more blue and blue, the more likely to 3900nm; K value is lower, the color of the light appears more and more tend to yellow and red, the more likely to 7600nm.

D50 light source (5000K color temperature) is a light-emitting body color slightly warm colors of the light source. According to ISO 3664: 2000, the D50 light source is the true color temperature of the observed color.D65 light source (6500K color temperature) is a light-emitting body color slightly cool colors of the light source. In Europe and the United States D65 light box light source is gradually replaced by D50 light source, but in China, D65 is still widely used in one of the standard color temperature.D35 light source is a color temperature of 3500K light source,D75 light source is a color temperature of 7500K light source,CWF light source is a color temperature of 4200K light source,U30 light source is a color temperature of 3000K white light light source,A light source is a color temperature of 2856K white light light source,F light source is a color temperature of 2700K white light light source,

The light source above the light box is not the standard color temperature of the light source, but to simulate in some special occasions (such as shops, families) to observe the use of goods when the light source color temperature.But the standard color temperature of the color light box is not necessarily the standard light source.According to ISO3664: 2000, the standard light source must meet two physical conditions at the same time:The color temperature of the light box is D50 (or D65)Light source color rendering index Ra> 90Color light box color rendering index used to measure a light source can see the color and natural light irradiation, you can see the color between the ratio, that is, Ra = in a light source can see To the color ÷ in natural light can see the colorRa is nearly 100% closer, indicating that the difference between the color that appears and the color appearing under natural light is smaller.TL83 is a light source with a Ra = 80 and a color temperature of 3000K.TL84 is a light source with Ra = 80 and a color temperature of 4000K.TL85 is a Ra = 80, color temperature of 5000K light source.965 is a light source with a Ra = 90 and a color temperature of 6500K.Of the above light sources, only 965 is the standard light source.

color assessment cabinet According to the requirements of the International Organization for Standardization ISO (ISO 3664: 2000), color and color matching must be observed using the standard Viewing Envirement in industries where printing, printing and dyeing are required to observe colors.The so-called standard light source on the light box observation conditions are:1. The light source must be a standard light source.2. observe the surface of the light intensity> 2000Lux / + - 500Lux3. Observe the background environment must be neutral gray
 The color of the light box on the market today, the sale of multi-light source on the color box can only be a very small space to simulate the color of several light sources to observe the small pieces of goods under different light colors according to ISO3664: 2000 standard, this The color box can not be used in the production process, the color of the product to observe and control the color light box printing process commonly used in ultraviolet light (ie UV lamp) to check some fluorescent ink printing effect, UV lamp wavelength is usually not Less than 3650nm. Because the shorter the wavelength of ultraviolet light, the greater the harm to the human body.To sum up, in the printing, printing and dyeing, advertising, ink coatings and other industries, must use the standard light source (D50 / D65, Ra> 90) to observe the color of the product.

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