This SAE Standard provides test procedures, performance requirements, design guidelines and installation guidelines for front fog lamps.
Rationale
Replaced Table 1 with Figure 1 and Table 2 with Figure 2 as requested by Lighting Advisory Group. Changed all related references to Table 1 and Table 2.
Figure 1 and Figure 2 photometric values revised to a reference luminous flux of a light source at 13.2 V rather than the traditional 12.8 V.
The original SAE photometric table based on a reference luminous flux for a design voltage of 12.8 V was developed to harmonize with ECE R19, whose photometric table was based on a reference luminous flux for a design voltage of 12.0 V. The SAE table was converted from the 12.0 V ECE Conformity of Production (COP) intensity values to 12.8 V using a multiplication factor to compensate for the voltage difference. However, constant current light sources like the ones used for LEDs and HID were not fully considered during this development. A constant current light source lamp will output the same intensity at any given test point at 12.0 V and 12.8 V. A filament light source over the same two voltages would output approximately a 20% difference in intensity using the equation:
This results in a greater restriction in terms of harmonization for constant current light source front fog lamps.
ECE R19 originally resolved this issue by including a 1.43 multiplication factor (1.0/0.7) for HID light sources. This factor was not included in the SAE document. To resolve this issue, ECE R19 moved from a 12.0 V photometric table to 13.2 V photometric table and removed the 0.7 multiplication factor for constant current light sources. Reference ECE-TRANSWP29-GRE-62-01e. Moving to a reference luminous flux representative of 13.2 V also aligns with the agreement that ECE and SAE would migrate to a common design voltage of 13.2 V. To harmonize with ECE R19 and to resolve the constant current light source issue, it was decided to update the SAE photometric tables to be based on the reference luminous flux representative of 13.2 V.
To aid test labs with the transition to 13.2 V, a note was added to each figure which allows filament light source front fog lamps to be tested at the rated luminous flux representative of 12.8 V provided that the measured values at each test point is scaled by a factor of 1.10 based on the equation above. This eliminates the requirement for each test lamp to replace their 12.8 V accurate rated light sources with 13.2 V accurate rated light sources.
In Figure 2, replaced Zone 1 with 10 separate photometric test maximums to harmonize with ECE R19.
Included a note in 5.2.5 referencing the 13.2 V value.
Restricted the color of a front fog lamp used like a bending lamp or cornering lamp to white and lamps without this functionality from white to selective yellow to harmonize with ECE.
With these changes, SAE J583 and ECE R19 are harmonized for photometry requirements for an “F3” front fog lamp.
The Road Illumination Devices Standards Committee is part of the Lighting System 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 lighting devices that serve to provide forward illumination on the roadway, including headlamps, fog lamps, auxiliary high and low beam lamps as well as halogen and arc discharge source lamps used in these devices. The following task forces have been developed under the committee's scope: J1735 Harmonized Headlamp Beam Task Force J583 Fog Lamp Task Force J2111 Headlamp Washer Task Force J1383 Headlamp Task Force J2585 Headlamp Mounting Height Task Force J2282 Distributed Lighting Task Force Replaceable Bulb Task Force Coated Bulb Task Force J852 Front Cornering Lamps Rewrite Task Force J2591 Advanced Forward Lighting System (AFS) J2009 Rewrite Task Force J599 Lighting Inspection Code Task Force J2595 Sealed Beam Headlamps Task Force J2510 Front Fog Lamp Task Force J565 Rewrite Task Force Pedestrian Visibility Task Force Recent standards challenges have been the introduction of "discharge" source lamps into the automotive lighting industry, harmonization of light patterns with European standards and higher voltage automotive electrical systems. While arc discharge light sources held promises of higher light output and source brightness, they surfaced many new and unanswered questions. Task force work is now ongoing in an attempt to resolve all of the new issues. Even changes in light distribution from recently-improved headlamp light sources, compounded by an increase of large SUV and personal pick-up vehicles have caused a public outcry about "glaring" headlamps. In an effort to preempt regulatory action, the Committee has initiated task force work to find a solution. Finally, Vehicle voltage changes promise to become a significant lighting issue as the effects of higher voltages on the viability of filament lamp designs are researched and discussed. The committee also focuses on standards harmonization for a wide variety of unsettled differences between European (ECE) Standards and domestic (SAE and FMVSS) standards. Resolutions of the more significant differences in standards for fog and head lamps and distributive light sources have been reached. A further challenge remains in coordinating the new and improved standards with new and subtle insights into the human factors of vision and the importance of light and illumination for driver comfort and safety. Understanding the human factors of vision will take on a greater role in evaluating and enhancing the validity of new vehicle forward lighting standards. Participants in the SAE Road Illumination Devices Standards Committee include OEMs, suppliers, consulting firms, government, and other interested parties.
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