What condition would cause any light assembly to fail?

A light assembly would fail if it is cracked because a crack can compromise its integrity, functionality, and safety. A cracked light assembly may lead to issues such as inadequate illumination, which could impair visibility during night driving or in adverse weather conditions. Additionally, a crack can allow moisture to enter the assembly, leading to further electrical issues or deterioration of the light bulb or components within.

Minor scratches, while they may affect the appearance of a light assembly and potentially reduce its effectiveness slightly, typically do not cause it to fail outright. Faded color may indicate aging or reduced performance but does not necessarily indicate a failure. Visible dust, while it can obscure the light’s output, does not render a light assembly inoperative and can often be cleaned without any permanent damage. Therefore, the presence of a crack is the most critical issue that would warrant a failure in a safety inspection.