This document, AATCC Test Method 16.3-2014, outlines comprehensive procedures for determining the colorfastness to light of textile materials using xenon-arc lamp exposure. It details general principles and three specific test options: Xenon-Arc Lamp with Alternate Light and Dark cycles, and two options with Continuous Light (Black Standard or Black Panel). Applicable to all textile types, colorants, finishes, and treatments, the method requires exposing specimens alongside AATCC Blue Wool Lightfastness Standards under controlled environmental conditions. Color change is assessed visually using the Gray Scale for Color Change or instrumentally, quantified in AATCC Fading Units (AFU). The standard covers apparatus, specimen preparation, machine operating conditions, calibration, and safety, emphasizing the necessity for contractual agreement regarding the correlation between accelerated test results and real-world exposure.

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