On the airfield in Griesheim (near to Darmstadt) three headlamp pairs with Halogen (Opel Vectra), HID ( Audi A6) and LED (Audi R8) were mounted on a rack of a car which was positioned 50 m from the test person car.The rack can be tilted for varying the glare illuminance of the test persons sitting in the other car. The disability glare was tested with a Landolt ring (visual acuity) and the discomfort glare was determined by a psychophysiological scale from 0 to 100
(0 for no glare, 100 for total glaring).
The results for all test persons are analysed using SPSS software for statistical mathematics, and according to the analysis the greatest disability and discomfort glare come from the halogen headlamps. These results refute the results of other studies done over the last 10 years, which have concluded that bluer, higher-intensity LED and HID lights are more glaring. The full results of this project will be presented in details on the ISAL-conference September 2009 (Darmstadt-Germany) info@isal-symposium.de
