Light Sources in Laboratory Accelerated Test Devices

The light sources commonly used for laboratory-accelerated weathering tests include filtered xenon arcs, two types of filtered carbon arcs, fluorescent UV lamps, and metal halide lamps. The spectral power distributions are shown in Figures 8.3 through 8.6 in comparison with solar radiation. The spectral emission characteristics of the sources differ significantly in both the UV and visible regions.

Filtered Xenon Arcs Xenon arc radiation appropriately filtered for the UV region closely matches terrestrial solar radiation in the short-wavelength solar cut-on region and provides good simulation to it in both the UV and visible regions. The xenon arc has become established worldwide as the radiation source used for optimum simulation of the effects of daylight, both direct and through window glass, depending on the type of filters used. Figure 8.3 shows the SPD of a water-cooled xenon arc filtered with the combination of a near-infrared absorbing glass cylinder (CIRA) and a soda lime glass cylinder (C) compared with the SPD of

Figure 8.3. Spectral power distributions of the water-cooled xenon arc with coated infrared absorbing (CIRA) quartz inner and soda lime glass outer filters (—) and noon daylight in Miami, FL at 26°S exposure during the spring equinox (---). (Courtesy of Atlas Material Testing Technology LLC.)

Wavelength, nm

Figure 8.3. Spectral power distributions of the water-cooled xenon arc with coated infrared absorbing (CIRA) quartz inner and soda lime glass outer filters (—) and noon daylight in Miami, FL at 26°S exposure during the spring equinox (---). (Courtesy of Atlas Material Testing Technology LLC.)

Carbon Arc Wavelength

Figure 8.4. Spectral power distributions of the enclosed carbon arc (—), the open flame carbon arc with Corex D® Filters (—), and noon daylight in Miami, FL at 266° S exposure during the spring equinox (—). (Courtesy of Atlas Material Testing Technology LLC.)

Wavelength, nm

Figure 8.4. Spectral power distributions of the enclosed carbon arc (—), the open flame carbon arc with Corex D® Filters (—), and noon daylight in Miami, FL at 266° S exposure during the spring equinox (—). (Courtesy of Atlas Material Testing Technology LLC.)

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