1. An LED lighting apparatus comprising:a rectifier circuit configured to output a rectified voltage;
a channel unit configured to provide a discharge current to an output terminal of the rectifier circuit when the rectified voltage is equal to or higher than a first level;
a first LED group connected to the rectifier circuit, and configured to emit light in response to the rectified voltage equal to or more than a second level which is higher than the first level;
a balancing resistor connected to an output terminal of the first LED group;
a balancing circuit configured to form a balancing path between the rectifier circuit and the balancing resistor and perform first regulation on a current of the balancing path, in response to the rectified voltage less than a third level which is higher than the second level;
a second LED group connected to the balancing resistor, and configured to emit light in response to the rectified voltage applied through any one of the balancing path and the first LED group;
a driver configured to selectively provide a current path for the turned-on first and second LED groups and the discharge path of the channel unit by comparing a sensing voltage and an internal reference voltage; and
a sensing resistor configured to sense a driving current outputted from the driver through the current path, and provide the sensing voltage.