Test apparatus for determining resistance to light and weather influences

Apparatus for determining resistance to light and weather influences of sample surfaces, said apparatus including, in combination, with at least one source of light disposed for irradiation of said sample surfaces:

• fastening means (34) for fastening at least one sample for a period of time during which radiation from said source is incident on at least a portion of the surface of said sample,
• radiation measuring means (15) comprising radiation detection means (14) and radiation indicating means (24;
• 27,28), and
• light guiding means (1, 2, 3;
• 29;
• 8;
• 9), having a plurality of input terminals, each in the vicinity of one of said fastening means (34), for guiding a portion of the radiation of said at least one light source from said input terminals to said radiation measuring means (15), said input terminals being disposed for receiving radiation from said at least one light source comparable with the radiation incident on portions of said at least one sample respectively adjacent to said input terminals,
• wherein, in accordance with the invention, said radiation measuring means (15) comprises,
• means (12) for producing a spectral dispersion of radiation received from said light guiding means and thereby making spectrally dispersed radiation incident on said radiation detection means (14), and
• means (16) for adjusting said radiation detection means so as to selectively detect radiation in at least one of a plurality of spectral regions.