An energy saving type of light emitting diode lamp is disclosed. In such a manner, the human body sensor may be used to detect existence of the human body. Thus, the LED lamp is disposed at a low illuminance state normally, and may be converted into a high illuminance state when the human body approaches....http://www.google.de/patents/US20030117803?utm_source=gb-gplus-sharePatent US20030117803 - Energy saving type of light emitting diode lamp
