SAE J1889_201907

This SAE Recommended Practice applies to functions of motor vehicle signaling and marking lighting devices which use light emitting diodes (LEDs) as light sources. This report provides test methods, requirements, and guidelines applicable to the special characteristics of LED lighting devices. This Recommended Practice is in addition to those required for devices designed with incandescent light sources. This report is intended to be a guide to standard practice and is subject to change to reflect additional experience and technical advances. The 2015 revision of SAE J1889 expedited production testing, yet allowed previous methods when appropriate. The purpose of the 2019 update is twofold: 1 To allow industry to take advantages of new technologies, such as camera-based photometry (SAE J3100). This requires a better definition of photometric stability. 2 To allow shorter warm up times, when appropriate, by use of pre-determining minimum ratio. This could facilitate more frequent production quality checks. Additional concerns are addressed related to minimum photometric values not being measured at 30 minutes per the 1999 version of SAE J1889 and the use of that version by Transport Canada when conducting compliance audit testing of LED lighting devices, as indicated in their Road Safety Bulletin published August 2004. Changes to this version will reference 30 minute photometric values by direct measurement or by a ratio method from a pre-determine ratio value.