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The properly filtered xenon lamp is so similar to sunlight in spectral power distribution among various light sources, especially in UV and visible range, that its use is increasing in light exposure test. However, there is a criticism of this test mainly in automobile industry because of its lack of acceleration.
The authors developed a light fastness test system in which a xenon lamp is used, the distance between the lamp and samples is shortened to get a larger radiation effect, and a filter glass is placed in front of a specimen so as to simulate the actual environment which materials encounter in an automobile compartment. The point was how to simulate a no-air-flow condition and a temperature distribution among the surface and the backing of a material.
In this new xenon lamp testing method, a good correlation with an outdoor exposure test as well as higher acceleration has been obtained. This fading in actual outdoor exposure for one year was reproduced in about five days in the experiments where automobile interior materials, textile and plastics, were used.
light exposure, black panel temperature
Vice president, Suga Test Instruments Co., Ltd, Tokyo,