1.1This practice covers the basic principles and operating procedures for using metal halide light and water apparatus intended to reproduce weathering effects. This practice is limited to the procedures for obtaining, measuring, and controlling conditions of exposure. 1.2Test specimens are exposed to filtered metal halide light under controlled environmental conditions. Different types of metal halide light sources and different filter combinations are described.

Metal halide artifical sources with a wide range of spectral and intensity properties are being promoted for use in artifical weathering devices. Standardization is needed to diferentiate the various types of metal halide sources and recommend best practices for their use. This standard is targeted to manufacturers, test laboratories, and industrial end users of weathering devices.

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The title and scope are in draft form and are under development within this ASTM Committee.