Textile Testing Equipment Light Fastness Tester Mercury Tungsten Lamp Australian Standard Standard AS2001.4.21. Applications Fiber, yarn, light scatter-free textiles. Product Instruction Light Fastness Tester determines the color fastness and degradation due to the effects of sunlight on textiles. - 500 watt standard Mercury Tungsten Lamp. - Max. 12 specimen holders hang along the test chamber internal wall, exposure the specimens to the light