6 kinds of light sources commonly used in printing and dyeing

2021/04/20

Guide: Since the same color under different light sources, different dyes, and different background colors will produce different effects, you must print and dye colors according to the requirements of the light source specified by the customer during work. Before the project starts, you must ask the customer for the light source. The customer's order does not indicate the standard light source, so you must communicate with the customer in time to avoid unnecessary costs.



6 kinds of light sources commonly used in printing and dyeing
Send your inquiry

6 kinds of light sources commonly used in printing and dyeing


 Common light source for printing and dyeing

 

1. What is a standard light source?

 

Light sources are actually divided into natural light sources and artificial light sources. The former mainly refers to sunlight, while the latter includes various electric light sources such as incandescent lamps, halogen lamps, fluorescent lamps, and xenon lamps. In daily life, people are used to recognizing colors under natural light. However, due to the influence of time, climate, season, latitude and other factors, the light color of natural light is not stable, so modern industry is more inclined to use artificial light sources to achieve accurate color matching.

Related nouns:

 

The color temperature (colo(u)r temperature) is a measure of the light color of the light source, and the unit is K (Kelvin). Color temperature has important applications in photography, video, publishing and other fields. The color temperature of the light source is determined by comparing its color with the theoretical thermal blackbody radiator. The Kelvin temperature when the hot black body radiator matches the color of the light source is the color temperature of that light source, and it is directly related to Planck's black body radiation law.

 

2. Three stages of standard light source development:

 

In order to define artificial light sources for evaluating color appearance, CIE (International Commission on Illumination) has successively stipulated a series of standard illuminators and standard light sources. Its development roughly experienced three stages:

 

1.In 1931

CIE stipulates three standard illuminators, A, B, and C, and recommends corresponding standard light sources;

 

2. 1967

In order to make up for the deficiencies of standard illuminators B and C in the ultraviolet region, D series standard illuminators are specified, including D50, D65, D75, etc., spanning the ultraviolet, visible and infrared regions of natural light;

 

3. After 1970

With the increasing popularity of fluorescent lamps and their widespread commercial applications,  CIE has stipulated F series fluorescent light sources , F1-F6 are ordinary fluorescent lamps, F7-F9 are high color rendering fluorescent lamps, and F10-F12 are three-primary fluorescent lamps.

 

3. Commonly used light sources:

Nowadays, which light sources are more commonly used when using color matching light boxes? Let's take a look

 

3.1 D65 light source:

 

Most customers use it for color matching

 

 D65 light source

 

Among the D series standard illuminators, CIE recommends D65 as the preferred illuminator. D65 represents the average daylight with a correlated color temperature of 6500K. It is an average result of measuring the daylight of the northern window of the northern hemisphere during cloudy days, regardless of the season and time of the day. In many standards such as ISO105-A01 "Textile Color Fastness Test General Rules" and ASTM D1729 "Standard Method for Visual Evaluation of Opaque Materials", D65 is an indispensable standard light source. However, due to the special spectral power distribution of D65, there is currently no artificial light source that can emit light that is exactly the same as the D65 spectral power distributio

n, which can only be approximated by simulation.

 

3.2 TL84 light source

 

Japanese shop light source, usually used by European and Japanese customers

TL84 light source

The TL84 light source is a three-primary fluorescent light source with a color temperature of 4000K, which is a unique product of Philips. Because it is widely used in Marks&Spencer (Marks & Spencer) in the United Kingdom, it has become an important commercial color light source in the European market. Nowadays, Japanese shop lighting, European and Japanese customers usually specify the use of TL84 color light source.

 

3.3 CWF light source

 

American shop or office light source, American customers often use this light source

CWF light source

CWF light is mainly used in commercial and office organizations in the United States, with a correlated color temperature of 4150K and a power of 18W. CWF is the abbreviation of CoolWhiteFluoresent, that is, Cool White Fluoresent, a light source for American stores or offices, and American customers often use this light source.

 

3.4 UV light source

 

Used to detect brighteners or fluorescent dyes on fabrics

UV light source

Generally, the color light source box is also equipped with a UV light source, which is a kind of ultraviolet light, which is often used alone or in combination with other light sources to check whether the fabric products have whitening and contain fluorescent dyes.

 

Light source name

Lamp type

Color temperature ① 

Color index

Content and purpose

D75  

The filtered tungsten lamp

7500K

95+

It simulates the sunlight going north to the sky, in line with the American visual color assessment.

D65   

The filtered tungsten lamp

6500K 

95+

The average northern sky daylight is simulated, and the spectral value meets the visual color standards of countries around Europe and the Pacific. 

D50 

The filtered tungsten lamp

5000K 

95+

Simulating the noon sky light, the color quality and consistency are good in the graphic art.   

D75*

Mean daylight with fluorescence

7500K

94

The American visual color standard simulates the northern sky daylight. 

D65*

Mean daylight with fluorescence

6500K  

93

The visual color standard of Europe and the surrounding areas of the Pacific Ocean simulates the average northern sky daylight.

D50*

Mean daylight with fluorescence

5000K

92

It simulates the sunlight in the northern sky, and the color quality and consistency are good in the graphic art.

CWF

American Commercial Fluorescence

4150K

62

Typical American shopping mall and office lighting, metamerism ② test.

U30

American Commercial Fluorescence

3000K

85

Rare earth commercial fluorescent lamps are used for shopping mall lighting. Equivalent to TL83.      

TL83

European Commercial Fluorescence

3000K

85

Typical American shopping mall and office lighting, with the same color and different rare earth commercial fluorescent lamps, used for shopping malls and office lighting in Europe and the Pacific Ocean.

U41

American Commercial Fluorescence 

4100K

85

Rare earth commercial fluorescent lamps are used for shopping mall lighting. Equivalent to TL84.          

TL84

European Commercial Fluorescence

4100K

85

Rare earth commercial fluorescent lamps are used in shopping malls and office lighting in Europe and the Pacific peripheries.

Inca A

Tungsten halogen lamp (incandescent lamp)

2856K

95+

Typical incandescent lamp for metamerism test, a light source used in homes or shopping malls.

Horizon

Tungsten halogen lamp (incandescent lamp)

2300K 

95+

Simulate the sunlight in the morning and sunset in the afternoon, metamerism test.

WWF 

American Commercial Fluorescence

3000K

70

Typical American shopping mall and office lighting, metamerism test.

UV

Ultraviolet light

BLB

N/A

Used to check the effect of brighteners, fluorescent dyes, etc.

MV

Ultraviolet light

4100K

70

Mercury lamps are used in some shopping malls, factories, and street lighting.

MH

Ultraviolet light

3100K

65

 Metal halide lamps are used in shopping malls. 

HPS

Ultraviolet light

2100K

50

High-pressure sodium lamps, used in factories.

 

3.5 F light source

Home and hotel lighting

F light source

     Sunset light, yellow light source, colorimetric reference light source, color temperature: 2700K, power: 40W;

 

3.6 U30 light source

American Store Warm Light

U30 light source

U30 is the American Warm White Fluorescent. As the TL83 light source used in Europe, there is only a difference in color temperature between the two. U30 light source color temperature: 3000K, power: 18W color temperature.

 

4. The list of commonly used light sources

5.light source to color light box

 

The light source pair color light box is widely used in the visual evaluation of the color fastness of materials in textile, printing and dyeing industries, color matching and proofing, identification of color difference and fluorescent substances, etc., so that the sample, production, quality inspection, and acceptance are carried out under the same standard light source. Check the color deviation of the goods to ensure that the color quality of the goods meets the requirements.

 

In order to make the color matching results more accurate, there should be no direct light from outside in the observation area during color matching in the standard color matching light box, so as to avoid the interference of external light on vision.


Send your inquiry