Abstract
An equipment for an automatic headlight dimming system is described which has the essential following requirements: a) It is not sensitive to the headlights of other vehicles. b) It gives a variable level of dimming ranging from no dimming at all where there is no or poor street lighting to full dimming in good street lighting. c) It dims at a slow rate but brights-up at a fast rate. d) It dims not headlights when they are switched on in daylight fog.