SAE J575_202104

This SAE Recommended Practice is intended as a guide toward standard practice and is subject to change to keep pace with experience and technical advances. This document provides standardized laboratory tests, test methods and equipment, and requirements for lighting devices covered by SAE Recommended Practices and Standards. It is intended for devices used on vehicles less than 2032 mm in width. Tests for vehicles larger than 2032 mm in overall width are covered in SAE J2139. Device specific tests and requirements can be found in applicable SAE technical reports. A study was done regarding the releavance of the lens impact test with plastic lenses. It was shown that more than 30 times the impact force of the glass lens impact test is required to crack a polycarbonate or impact resistant PMMA headlamp lens of typical thickness. In review ot the test history, it was determined that the required force was designed around the impact strength of a glass lens. The impact test will be split into two types of material: glass lenses and plastic lenses (4.3). For glass lenses, the historical impact force of 0.196 J is used, but for plastic lenses the impact force is increased to 10X that of a glass lens. The equivalent road velocity versus impact mass is shown in the curve below for the plastic lens test energy of 1.96 J. Section 4.3 renumbered to include plastic headlamp lens impact test. Section 4.11.8 numbering error corrected (4.10.7 ➔ 4.11.7).