Specifies an accelerated method for determining the light fastness of coloured anodic oxidation coatings using artificial light. Suitable for coloured anodic oxidation coatings on aluminium and its alloys, produced by any means and for any purpose and for quality control testing of coloured anodic oxidation coatings whose light fastness rating has already been established by means of outdoor exposure testing, but not with a light fastness rating of less than 6. Neither for evaluating light fastness under exterior exposure, as only outdoor testing under conditions comparable to actual service is completely satisfactory.