Patent ID: 8247978

Claim:
An illumination device comprising: a light source adapted for getting an alternating current from an AC power source; and a balance sensing switch connected between the light source and the AC power source, the balance sensing switch automatically cutting off an electrical connection between the light source and the AC power source when the illumination device is moved from a first position for a normal use of the illumination device to a second position different from the first position; wherein the balance sensing switch comprises a balance sensing module and a switch module, the balance sensing module outputs a signal to the switch module when the illumination device is moved from the first position to the second position, and the switch module switches off the electrical connection between the light source and the AC power source upon receiving the signal; and wherein the balance sensing module comprises an electromagnet consisting of a coil and a magnetizable core wound by the coil, a balance sensor, and a DC power source electrically connected with the coil of the electromagnet, the DC power source supplies a current to the coil of the electromagnet via the balance sensor, the balance sensor senses a position status of the illumination device and controls a current supply of the DC power source to the coil of the electromagnet.