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Evaluation of After-Market Light Emitting Diode Headlight Bulbs
Technical Paper
2019-01-0850
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Taking advantage of growing consumer interest in light emitting diode (LED) headlights, an increasing number of after-market LED replacement bulbs is available on the market. They are designed to have similar socket shapes and sizes as halogen bulbs, in order to fit into existing headlight housings. Although none of these LED replacement bulbs conform to present federal headlighting regulations, and some are labeled for "off road use" only, others claim to meet current regulations. Regardless, many different LED bulbs can be easily purchased and installed by vehicle owners, who may or may not be aware of their regulatory status. Several different LED replacement bulb kits, each designed to replace a conventional 55-W H11 halogen bulb, were purchased and tested in three different low-beam headlight units. Photometric measurements at several critical test points for headlight performance revealed that none of the resulting distributions met all of the test point photometric requirements. Some intensity values were lower than allowed minima while others exceeded allowed maxima. Photographs of the resulting beam patterns for each combination of LED bulb and headlight unit, when compared to the patterns with the halogen bulb, revealed stark differences in performance between the halogen and LED bulbs. Even though some bulbs more closely matched halogen performance, performance for different headlights using the same LED bulb could vary widely. These findings suggest that using after-market LEDs to replace halogen bulbs can compromise headlighting performance.
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Authors
Citation
Liu, Y. and Bullough, J., "Evaluation of After-Market Light Emitting Diode Headlight Bulbs," SAE Technical Paper 2019-01-0850, 2019, https://doi.org/10.4271/2019-01-0850.Data Sets - Support Documents
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References
- Bullough , J.D. Public Perceptions of Vehicle Headlamps: Visibility and Glare SAE Technical Paper 2011-01-0110 2011 10.4271/2011-01-0110
- National Highway Traffic Safety Administration Nighttime Glare and Driving Performance: Report to Congress Washington, DC National Highway Traffic Safety Administration 2007
- RAC Limited Motorists Claim to Being Regularly Left Dazzled by Modern Vehicle Headlights Walsall, UK RAC Limited 2018
- Bullough , J.D. Lighting Answers: LED Lighting Systems Troy, NY Rensselaer Polytechnic Institute 2003
- SAE International Surface Vehicle Recommended Practice 2013