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Interviews with SAE 2010 Presenters PDF Print E-mail
Monday, 03 May 2010
Q&A with Nils Haferkemper, DUT Darmstadt

DVN: I was very surprised by your experiments which show almost no influence of switching low beam. How do explain we are using these features on motorcycles for so many years?

I do not know the historical background, because it is just accessible in detail from protocols, but my opinion is that in the end it was a simple solution and it is pretty comprehensible that switching on the low beam during daytime was assumed to increase conspicuity. From the literature I was not able to find any field test leading to this consequence.

DVN: How do you explain the great different on visibility distance between low beam and LED DRLs? Is it because the shape, the illuminance on the eye, the colour of the light or is there any other reason?

The major advantage to low beam is the extremely high luminance of the DRLs.
This is what mainly contributes to the observed effects. Of course the colour is new to most road users, but the German federal highway research institute (BASt) found out in a static experiment that there is no significant effect of colour in conspicuity. Also from the physiological side this can be neglected. It is not sure which influence the shape has because that was not a point of research for us, but it would be interesting to have a study about that!

DVN: Don't you think there would be a big confusion between motorcycles and cars if they are equipped with the same lights?

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Editorial PDF Print E-mail
Monday, 26 April 2010
Two weeks after the SAE SHOW at Detroit, Driving Vision News publish a report which is meant for the lighting community, for experts who were not present or experts who attended the congress but missed some important lectures.
The main lectures which we selected in this report can be classified in 2 categories:

1. Innovations
- On LEDs, Lawrence Rice from Osram Sylvania and Rainer Neumann from Visteon presented future LED headlamps. Rice presents a headlamp with one LED module producing the same performace as a halogen bulb, and Neumann shows a headlamp with low beam of 135mm × 50mm with performance not far off the Xenon benchmark.
- On Xenon 25w, Jean-Sebastien Straetmans from Philips presents the possibilities of an integrated module and the benefits on size, weight and consumption saving.
- On front end structure, Ankit Garg from GE India shows a novel energy absorber concept to improve the pedestrian safety, low speed vehicle damageability performance and replacement cost reduction.

2. Studies and Surveys
- TU-Darmstadt university was very present at Detroit with 2 lectures.
One was about the evaluation of headlamp cleaning system from lab and field measurements. Stefan Soellner showed the first part of this evaluation (the second part will be presented at VISION congress this coming October in France).
The second lecture, from Nils Haferkemper, emphasizes the positive influence of LED DRL feature on the conspicuity of motorcycles.
- John Bullough from Rensselaer Polytechnic Institute presented 2 lectures, one about the development of a system that can be mounted everywhere to efficiently gather relevant data about headlamp patterns, and the second showing the large influence of ambient illuminance from urban areas on the visibility of relevant targets, and show advantages of different headlamp for different target locations where pedestrians might be encountered.

In driver assistance , in a time where so many technologies are arriving in high beam assistant or adaptive lighting, we had only one lecture. This was from Honda R&D's Haruhiko Nishiguchi about Blind Spot Detection and the image processing method for easier perception of speed from the camera image.

All these lectures are detailed with a lot of explanations, snapshots and figures.
A strong and new point in SAE 2010 congress DVN report is that at the end of each lecture, DVN interview the speaker about his lecture.
I hope you will enjoy reading this report at

Sincerely yours
DVN, General Editor

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