A lamp system for a vehicle that may secure visibility at a longer distance with the same power consumption according to a driving state of a vehicle to help a user or a sensor recognize a surrounding environment. The lamp system includes a lamp unit installed in front of the vehicle to radiate a beam toward the front, a sensor unit sensing a driving state or driving environment information of the vehicle, and a controller controlling the lamp unit to change a beam pattern radiated by the lamp unit based on the information sensed by the sensor unit, and controlling beam patterns before and after the change to consume the same power.
