Patent ID: 8754588

Claim:
An illumination apparatus comprising: a non-isolated power supply circuit which outputs a DC power obtained by rectifying an AC voltage inputted from an AC power source having a ground phase through a pair of power feed lines and stepping up the rectified voltage; a light source unit having one or more semiconductor light emitting elements which are turned on by the DC power outputted from the power supply circuit; and an apparatus housing which is formed of a conductive material that is grounded through a ground path and on which the power supply circuit and the light source unit are mounted, wherein when only one of the power feed lines is cut off, the semiconductor light emitting elements are supplied with an AC power from the AC power source through the ground path and a stray capacitance which is formed between the light source unit and the apparatus housing, and a forward voltage of each of the semiconductor light emitting elements supplied with the AC power has a light emission level that is not recognized by a human eye.