This part of ISO 4892 specifies methods for exposing specimens to xenon-arc light and water apparatus to reproduce the weathering effects that occur when materials are exposed in actual end use environments to daylight, or to daylight through window glass. The specimens are exposed to filtered xenon-arc light under controlled environmental conditions (temperature, humidity and/or moisture). Different types of xenon-arc light sources and different filter combinations may be used to meet all requirements. Specimen preparation and evaluation of the results are covered in other ISO documents for specific materials. General guidance is given in ISO 4892-1.