<p>PURPOSE: An alternating current direct-coupled type light emitting diode lighting apparatus is provided to improve light efficiency and total harmonic distortion phenomena by supplying a constant current to all light emitting diodes with voltage less than or equal to forward direction threshold voltage. CONSTITUTION: A first constant current circuit(100) applies a constant current to first and second light emitting diodes(20,21). The first constant current circuit is connected between a rectifier diode(10) and the first light emitting diode. A current detection circuit(200) detects a current flowing to the second light emitting diode through the first light emitting diode. A second constant current circuit(300) supplies a second constant current to the first light emitting diode. A third constant current circuit(400) supplies a third constant current to the second light emitting diode.</p>
