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2024-12-18
D65 light source and TL84 light source are two commonly used color matching light sources in standard light boxes. They are both white light sources in nature , of which D65 light source is a standard white light source, while TL84 light source is a typical warm white light source. So, what is the difference between D65 light source and TL84 light source? The following is an introduction.
D65 light source
The D65 light source is an artificial light source that simulates daylight. Its actual color temperature is 6500K and its color rendering index Ra>90. It can ensure that when users observe the color of objects indoors or on rainy days, they have a lighting effect close to that under natural light.
D65 light source is not a common lighting source, but a standard light source specially used for color detection. CIE (International Commission on Illumination) has the following definition for standard light source: the relative spectral power distribution of CIE standard light source is similar to the relative spectral power distribution of CIE standard illuminant.
CIE standard illuminant: An illuminant defined by CIE using relative spectral power distribution.
Simply put, the D65 standard light source is an artificial light source that simulates the spectral power distribution of the standard illuminant D65. The standard illuminant represents the relative spectral distribution of daylight at different times, and this light is also called typical daylight or sufficient daylight. Typical daylight has a very similar relative spectral power distribution to actual daylight, and is more consistent with the color quality of actual daylight than standard illuminants B and C. CIE recommends several specific relative spectral power distributions in standard illuminant D as standard daylight in photometric and chromatic calculation and measurement. They are called CIE standard illuminants D50, D65, D55, and D75, respectively, and the correlated color temperatures they represent are 5003K, 6504K, 5503K, and 7504K, respectively. CIE stipulates that CIE standard illuminant D65 should be used to represent daylight whenever possible, and D55 and D75 can be used when D65 cannot be used.
TL84 Light Source
TL84 light source is a standard light source that simulates natural light. It was recommended by the International Commission on Illumination (CIE) in 1984 and is mainly used to evaluate the impact of light sources on the color of objects. The main features of TL84 light source include:
1. Color temperature: The color temperature of the TL84 light source is 4000K, which is equivalent to daylight during the day, giving people a warm and natural feeling.
2. Color rendering index: The color rendering index of the TL84 light source is 95, which means that it can present the color of objects very accurately, making the color of objects under the TL84 light source very close to the actual color.
3. Spectral distribution: The spectral distribution of the TL84 light source is similar to daylight during the day and includes all wavelengths in the visible spectrum, which makes it widely used in fields such as color evaluation, color management and lighting design.
4. Irradiance: The irradiance of the TL84 light source is 1000 lux, which is a relatively high brightness that can provide enough brightness to evaluate the color of an object.
Due to the above characteristics, TL84 light source is widely used in color fields such as textiles, dyeing, printing, plastics, pigments, paints, inks, photography, etc. to accurately calibrate the color deviation of goods. TL84 light source is also widely used as a standard light source in stores in Europe, Japan, China and other regions.
Standard light source
The D65 light source is a standard white light source with a color temperature of about 6500K. The color rendering index (CRI) of this light source is usually above 90, with excellent color reproduction. Due to its high color temperature and high color rendering index, the D65 light source is often used in fields that require accurate color reproduction, such as photography, printing, and television broadcasting. In addition, the D65 light source also has high luminous efficiency and long service life, which makes it widely used in commercial lighting and display lighting.
TL84 light source is a typical warm white light source with a color temperature of about 4000K. The color rendering index (CRI) of this light source is usually between 80 and 90, which can provide good color reproduction and comfort. Due to its soft warm white light, TL84 light source is often used in home lighting, reading lights and decorative lighting to create a warm and comfortable atmosphere. In addition, TL84 light source also has high luminous efficiency and long service life, which makes it widely used in commercial lighting and display lighting.
From the above description, it can be seen that the main differences between the standard light source D65 light source and the TL84 light source are mainly reflected in the following three aspects:
1. Color temperature difference
As mentioned above, the color temperature of the TL84 light source is about 4000K, which is warm white light, while the color temperature of the D65 light source is about 6500K, which is standard white light. There is a clear visual difference between these two color temperatures, with TL84 presenting a soft warm white and D65 presenting a cool white. Therefore, depending on the application scenario, choosing the right color temperature can create the desired atmosphere or achieve the desired lighting effect.
2. Color rendering index difference
The color rendering index of TL84 light source is generally between 80 and 90, while the color rendering index of D65 light source is usually above 90. This means that D65 light source has better color reproduction, especially in the blue and green spectrum range. Therefore, in occasions where the true color of an object needs to be accurately presented, such as photography, printing, etc., D65 light source should be selected.
3. Differences in application areas
Due to the different characteristics of TL84 and D65 light sources in terms of color temperature and color rendering index, their application fields are also different. TL84 light sources are suitable for home lighting, reading lights, decorative lighting and other occasions that need to create a comfortable atmosphere; while D65 light sources are suitable for areas that require accurate color reproduction, such as photography, printing, television broadcasting, etc.
