1. A LED lighting apparatus comprising:a power supply unit;
a light emitting unit operating in response to a voltage applied from the power supply unit and comprising at least one first light emitting group having a first color temperature and being turned on at a first turn-on voltage (VB) and at least one second light emitting group having a second color temperature and being turned on at a second turn-on voltage (VA) greater than the first turn-on voltage;
a substrate mounting the light emitting unit; and
a voltage control unit controlling the level of the voltage applied from the power supply unit to the light emitting unit,
wherein the voltage is increased from the voltage lower than the first turn-on voltage to the voltage higher than the second turn-on voltage, the light emitting unit is emitted from the inside of the substrate and emitted from the first light emitting group to the second light emitting group,
wherein the voltage control unit comprising at least one variable resistor controlled the first light emitting group to emit warm white color.