UV-A lamps are especially useful for comparing different types of polymers. Fluorescent UV lamps are usually categorized as UV-A or UV-B lamps, depending on the region into which most of their light output falls. However, each lamp type differs in the total amount of UV energy emitted and in its wavelength spectrum. All are electrically equivalent to an ordinary 40-watt fluorescent lamp. Differences in spectra may affect both the speed and type of degradation.Īll of the QUV accelerated weathering tester's lamps emit mainly ultraviolet (UV) rather than visible or infrared (IR) light. However, xenon light must be properly filtered to achieve the appropriate spectrum for each particular application. For many materials, exposure to the full spectrum is necessary to provide an accurate simulation, especially when testing for color change and lightfastness. The Q-SUN family of xenon-arc testers uses xenon-arc lamps to produce the most realistic reproduction of full spectrum sunlight including UV, visible light, and infrared radiation. Several different types of UV lamps are available for different applications, and optical filters are not required. The QUV tester’s fluorescent lamps simulate the critical short-wave UV spectrum and reproduce the physical property caused by sunlight. UV light is responsible for almost all photodegradation of durable materials exposed outdoors.
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