This SAE Recommended Practice applies to functions of motor vehicle signaling and marking lighting devices which use light emitting diodes (L.E.D.’s) as light sources. This report provides test methods, requirements, and guidelines applicable to the special characteristics of L.E.D. 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.
Rationale
Current definition of photometric stability and commonly used procedure for testing LED functions greatly penalizes LED lamps in a production environment. Changes recommended to J1889 will expedite production testing without compromising accuracy. This version will describe a procedure to expedite testing but will allow testing to former J1889 methods.
Section 2 updated to meet SAE standards
Section 3.2 – LED definition changed to match J387
Section 3.7 – Removed
Section 3.8 - Clarified Photometric Stability definition and harmonized with J2650. New definition allows photometric data to be taken within the 15 minute stability box, instead of after. To maintain good accuracy during photometry the allowed stability drift is set at ±3%. Since section 3.7 was removed, photometric stability will be re-numbered to section 3.7
Section 5.1.1 - Removed extra performance requirement of photometric check for lamps not fully functional. This is covered in J575 and J2139
Section 5.1.5 Renumbered to accommodate changes. Clarified test point to use for ratio measurement because some functions do not have significant intensity at H-V
Section 5.1.5.1 - Clarifies use of SAE J1330
Section 5.1.5.2 - Adds statement lamps must be stabilized for test
Section 5.1.5.3 - Was added to provide procedure for testing all lamps at stabilization.
Section 5.1.6 - Removed warpage as it is covered in lamp level testing
Section 6.1.1 Removed extra performance requirement of photometric check for lamps not fully functional. This is covered in J575 and J2139
Section 6.1.5 Simplified requirement definition and included the option to flash function that flash during operation.
Section 6.1.5.1 Removed steady burning language, included in 6.1.5
Section 6.1.5.2 Removed intermittent burning language, included in 6.1.5
Section 6.1.5.3 Re-numbered to 6.1.5.1
Section 6.1.6 Removed warpage requirement as it is covered in lamp level testing
Section 7.2 was added to provide a method for predetermining photometric stability.
Section 7.2.1 Reference to section 3.8 was changed to Section 3.7 to reflect numbering change
The Signaling and Marking Devices Standards Committee is part of the Lighting Systems Steering Committee that reports to the Motor Vehicle Council (MVC). The Committee is responsible for developing and maintaining SAE Standards, Recommended Practices, and Information Reports related to exterior lighting devices used on passenger cars, light trucks, vans and multipurpose vehicles. The Committee monitors the development of related technologies and determines how they may be applied to signaling and marking devices, while also working towards the development of standards to aid in the application of various technologies. The following task forces have been developed under the committee's scope: J1889 LED Signal Lighting Task Force New Technology Signal Lighting Task Force J2030 Discharge Signal Lighting Task Force Geometric Visibility Task Force Miniature Bulb Task Force J593 Backup Lamp (Reversing Lamp) Task Force J2087 Daytime Running Lamp Task Force Side Mirror Turn Signal Task Force Participants in the SAE Signaling and Marking Devices Standards Committee include OEMs, suppliers, consulting firms, government, and other interested parties.
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L.E.D. Signal and Marking Lighting Devices
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