The meeting car to car, Lo/Hi-beam automatically transform design ideas of headlight is described, and the car will automatically change the distance adjustable light control circuit design, control system also includes open automatically according to ambient brightness near light or high beam headlights automatically turn on the lights / delay lights of the circuit design. The technology has support for manual / auto-darkening two modes, design simple, reliable, stable performance, convenience and low cost of construction characteristics, suitable for automotive lighting lighting system using the transformation.