Lighting controller for lighting device for vehicle

A lighting controller for a lighting device for a vehicle comprising:

• a current supply control unit for receiving a supply of an electric power from a power source and controlling a supply of a current to a semiconductor light source;
• a current detecting unit for detecting the current of the semiconductor light source;
• a resistance element that consumes the current when the semiconductor light source is turned on;
• a switch unit for forming a turning on circuit including the resistance element in a current supply path for connecting the current supply control unit to the semiconductor light source during an off operation and forming a bypass circuit for bypassing the resistance element in the current supply path during an on operation;
• and
• a switch control unit for deciding whether or not the detected current of the current detecting unit is a current showing a transient state, wherein the switch control unit turns off the switch unit when an affirmative decided result is obtained and turns on the switch unit when a negative decided result is obtained.