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Tabletop Light Fastness Tester TF421

4.5 (4 reviews)

Tabletop Light Fastness Tester is a powerful Xenon instrument with affordable price for conducting accelerated tests of light fastness and photo stability test.



Tabletop Light Fastness Tester is a powerful xenon instrument with affordable price for conducting accelerated tests of light fastness and photo stability test.

The TF421 is designed as a tabletop unit with a microprocessor controller for simple operation.


  • Microprocessor control with large LCD displays data and irrandiance wave-length curve.
  • Air cooled xenon lamp with 1.5KW measure, irradiance (420nm): 1.1W/m2 /nm.
  • Measure and control temperature relative humidity of test chamber, and displayed on large LCD.
  • Setting and display the cumulate light energy and exposure time.
  • Record the using time of xenon lamp
  • Specimen table with 200 x 280 mm exposure area.


87 kg


220 V50 Hz4 KW


Length:970 mmWidth:650 mmHeight:740 mm



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    4 reviews for Tabletop Light Fastness Tester TF421

    1. james

      very good alternative to large lightfastness testing chambers

    2. Patricia Agnes

      Looks good great price thanks

    3. Lawrence Leonard

      Absolutely fantastic! Great performance.

    4. Wright Cooper

      We just started using this and so far its worked great.

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    Testing Principle

    Colorfastness to light is the firmness degree to which the color of textiles is exposed to sunlight or simulated sunlight. The test of color fastness to light: arrange the sample with a set of blue wool standards samples (8 pieces) in a prescribed manner and to cover a part of the specimen and the blue standard sample with an opaque covering in the prescribed proportion. Expose the samples under specified conditions such as not being exposed to rain, etc. When the color difference between the exposed and unexposed parts of the sample is equal to a certain level of the discoloration gray card, or the color change of the specified blue standard sample is equivalent to a certain level of the discoloration gray card, stop the sun exposure. Finally, remove the cover, place the sample and the blue standard sample in the dark for 4H, and then evaluate the colorfastness level of the textile with the specified light source.

    Comparison Standard Substance

    According to the AATCC 16 standard, the AATCC blue wool standard samples is the first choice for all testing procedures. However, for different test procedures, the fading degree of the AATCC blue wool standard samples may be inconsistent. In the experience of known discoloration, any suitable textile material can be used as reference material. The reference material must be selected and confirmed by both partners and exposed to the sun at the same time as the test sample.

    Sample Preparation

    In general, the test requires at least 3 identical sample and comparison standards to ensure the accuracy of the data. Cut the sample according to the size requirements and the warp/weft of the fabric, mark each sample with a durable label. Fix the sample and the reference object in the frame to ensure that their surfaces are the same distance from the light source, and prevent the sample from pressing too tightly on the surface when the cover is used.

    Test Method

    The standard method for testing the light-color fastness has the following three methods: the sunlight experiment method, the xenon arc lamp test instrument method and the carbon arc lamp test instrument method. The sunlight method is closest to reality, but it is difficult to adapt to modern production management because of its long test period and inconvenient operation. Therefore, the latter two methods, which are less time consuming and easier to operate, are often used in practical work. Although the artificial light source used by the latter two methods is close to the sun, the results of the test will be affected because of the difference between the spectrum of the light source and the difference of the spectra of the various light sources. In case of any dispute, still, take the sunlight method as the mainstay. What are the methods for testing the colorfastness of the fabric? Through this article, I think you might have got some information. If you want to know more, please contact us. As a professional supplier of textile instruments, we are committed to continually improve the user experience, TESTEX Textile Testing Equipment is a reliable choice for testing textile quality. [contact-form-7 id="16355" title="Inquiry"]
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