The Light Technology Institute conducted an investigation among more than 300 car drivers, 60 truck drivers and 40 bus drivers. We found out that more than 60 percent feel that the greatest problem in driving at night is glare.
In theory, a car of today does not cause glare problems. However, in practice, most people feel glared. Consequently, technological improvements have to be made regarding the development of headlamps that will not glare. Another approach is to introduce more and better night vision systems to enhance drivers' sight with today's headlamps.
In the recent years LEDs became the standard light source for the dashboard, instrument panel and switches in automobiles. In the near future LEDs will bring ambient interior light functions into the vehicle. Advantages of the LEDs are a small installation space, low heat dissipation, the long lifetime and, with Multi-Color-LEDs, the possibility of color tunability. Ambient lighting of door surfaces, floor space and roof liner is beneficial, because it improves drivers orientation and thereby the driving safety.
However the optimal parameters of color and brightness are not known yet. An investigation of the Light Technology Institute follows this question and presents within this framework, how the choice of the ambient lightings color and brightness affect drivers contrast vision.