To reproduce these indoor light conditions, the QUV/cw uses ordinary cool white fluorescent lamps. Some industry test methods specify the use of cool white fluorescent lamps for indoor photostability testing. The QUV/uvc tester has multiple safety features to prevent stray UVC light from escaping it is also not equipped with condensation or water spray. The QUV/uvc model uses UVC lamps to deliver light concentrated at 254 nm to test for material durability against photodegradation effects resulting from exposure to UVC light. This short-wavelength, high-energy UVC light can also degrade the materials and surfaces it disinfects. UVC light is used widely in ultraviolet germicidal irradiation (UVGI), a technique used to eliminate harmful viruses and bacteria. Deionized water is recommended for all spray applications. The QUV/spray tester can be set to produce: UV alone, spray alone, or condensation. Longer periods can be used to achieve mechanical erosion. Short periods of spray can be used to create a thermal shock. The QUV/spray tester has the same functions as a standard QUV/se, but also includes a water spray system.
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