This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Improved Projector Headlamps Using HID (Litronic) and Incandescent Bulbs
ISSN: 0148-7191, e-ISSN: 2688-3627
Published March 01, 1994 by SAE International in United States
Annotation ability available
A new automotive headlamp has been developed under the designation LITRONIC (Light Electronics). In order to improve the light quality and to increase driver safety on the road, a gas-discharge lamp was chosen as the light source instead of the conventional incandescent bulb.
The projector headlamp is well-suited for the application of the LITRONIC system. Especially in the US market, there is currently a potential interest in applying projector headlamps in series production. Compared to conventional headlamps, advantages can be seen in the flexibility of this kind of headlamp from the styling view point.
In this paper, newly developed solutions for projector headlamps from Bosch will be presented, for HID as well as for incandescent bulbs. Applications for low beam and for high beam are included. By means of concrete examples, the improvements in light quality compared to conventional systems will be demonstrated. And the boundary conditions in relation to styling aspects (high vertical inclination of the outer lens, lens diameter, overall system length) are taken into account and will be discussed.
It will be shown that the projector headlamp system can be ideally applied to result in an improved US-light pattern, thus contributing to safety in night-time driving.
CitationNeumann, R., "Improved Projector Headlamps Using HID (Litronic) and Incandescent Bulbs," SAE Technical Paper 940636, 1994, https://doi.org/10.4271/940636.
- Lindae G. lmpovements of Low-beam pattern by Use of Polyellipsoid Headlamps (PES) SAE Technical Paper Series 850228 1985
- Woerner B. Neumann R. Motor Vehicle Lighting Systems with High Itensity Discharge Lamps SAE Technical Paper Series 900569 1990
- Neumann R. Woerner B. Litronic - new automotive headlamp technology with gas discharge lamp Automotive Design Engineering 1993 152 156 1993
- Eureka project No. 273 VEDILIS Vehicle Discharge Light System Final Report 1992
- Eureka projekt No. 273 VEDILIS Founding members Bosch Hella Philips Osram
- Technical report Recommendations for High Intensity Discharge (HID) Headlighting
- Neumann R. Hogrefe H. Computer Simulation of Light Distributions for Headlamp Systems SAE Technical Paper Series 910827 1991
- Olson P. L. Visibility Problems in Nighttime Driving SAE Technical Paper Series 870600 1987
- Olson P. L. Reducing the Problems of Nighttime Driving for older Individuals SAE Technical Paper Series 920616 1992
- Flannagan M. J. Sivak M. Gellatly A. W. Luoma J. A field study of discomfort glare from High-Intensity discharge headlamps Report No. UMTRI-92-16 University of Michigan Transportation Research Institute 1992
- Flannagan M. J. Sivak M. Battle D. S. Sato T. Traube E. C. Discomfort Glare From High-Itensity Discharge Headlamps: Effects of Context and Experience Report No. UMTRI-93-10 University of Michigan Transportation Research Institue 1993