This report investigates the use of single and multi-layer coatings on replaceable headlamp bulbs and how such coatings can affect the performance of bulbs in terms of light scattering, which can contribute to glare, and spectral separation in headlamps. Tests were developed to investigate the effects of absorptive and interference (multi-layer) coatings on bulbs, and on bulbs in headlamp systems. These tests provide validation for a proposed bulb color separation test, which establishes limits for spectral separation within the boundaries of SAE J578 white color requirements. The bulb color separation test provides a definitive selection criterion to identify bulbs that cause excessive light scatter (glare) and/or spectral separation in an optical system.
Rationale
The technical report covers technology, products, or processes which are mature and not likely to change in the foreseeable future.
BULBS USED IN THE ROUND 2 TESTING, LISTED BY BULB TYPE THEIR STUDY DESIGNATION, AND THE TYPE OF FILTERING TECHNOLOGY USED
TABLE 3
RESULTS OF THE GONIOMETER SCAN ANALYSIS FOR THE 9006 BULBS TESTED
TABLE 4
RESULTS OF THE GONIOMETER SCAN ANALYSIS FOR THE 9007 BULBS TESTED
TABLE 5
RESULTS OF THE GONIOMETER SCAN ANALYSIS FOR THE 9004 BULBS TESTED
TABLE 6
RATIOS OF SEEING LIGHT TO OPPOSING GLARE AND SEEING LIGHT TO MIRROR GLARE MEASURED USING THE REFERENCE REFLECTOR APPROACH
TABLE 7
ILLUMINANCES AT THE 50R-, 75R- AND B50L-POINT AND IN THE ZONE III OF AN HEADLAMP EQUIPPED WITH DIFFERENT H4-BULBS (ALL OF THEM OPERATING AT 55 W). THE “BRAND X” BULB DOES NOT REACH THE ILLUMINANCE REQUIRED IN THE 75R-POINT WHICH IS IMPORTANT PEDESTRIAN AND TRAFFIC SIGN RECOGNITION. IT EXCEEDS THE MAXIMUM TOLERABLE ILLUMINANCE IN THE B50L-POINT AND THE ZONE III AND THEREFORE CAUSES GLARE.
TABLE 8
ILLUMINANCE AT THE 50R-, 75R- AND B50L-POINT AND IN THE ZONE III OF A HEADLAMP EQUIPPED WITH DIFFERENT H7-BULBS; AGAIN THE “BRAND X” BULB DOES NOT REACH THE ILLUMINANCE REQUIRED IN THE 75R-POINT AND EXCEEDS THE MAXIMUM TOLERABLE ILLUMINANCE IN B50L
TABLE 9
PARAMETERS DESCRIBING THE BEAM QUALITY (COMPLIANCE WITH LEGAL REQUIREMENTS, INTENSITY INTEGRATED OVER THE GLARE REGION AND RATION INTENSITY IN GLARE REGION/HOT-SPOT) AND RESULTS OF COLOR SEPARATION TEST FOR VARIOUS COATED AND UNCOATED TEST BULBS; THERE IS A CLEAR CORRELATION BETWEEN THE RESULT OF THE COLOR SEPARATION TEST AND THE QUALITY OF THE BEAM PATTERN
TABLE 10
SUMMARY OF THE TEST RESULTS ON A SELECTION OF THE SAE ROUND ROBIN BULBS, AND THE ECE BULB TYPES
The Lighting Standard Practices 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 the general support of documents in other VESG committees that are 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 general practice documents while also working to support the development of standards to aid in the application of various lighting technologies. Task forces may be developed in the future to support these activities. The committee welcomes input from OEM¿s, suppliers, consulting firms, government, academic institutions and other interested parties
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Absorptive and Interference Coatings Applied on Replaceable Headlamp Bulbs
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Absorptive and Interference Coatings Applied on Replaceable Headlamp Bulbs
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