Patent ID: 8890436

Claim:
A color temperature adjustable LED lamp, comprising: a 3-way switch for selectively conducting a first live wire, a second live wire or the first and the second live wires; a mains detecting circuit connected to the 3-way switch for detecting a conducting state of the first live wire and the second live wire, wherein when the first live wire is conducted, a first partial voltage signal is generated, and when the second live wire is conducted, a second partial voltage signal is generated; an AND logic circuit connected to the mains detecting circuit, wherein when receiving the first partial voltage signal and the second partial voltage signal at the same time, the AND logic circuit generates a working signal; an oscillation circuit connected to the AND logic circuit and generating an oscillation signal corresponding to the working signal; a first LED array to emit a light with a first color temperature, wherein the first LED array is actuated while receiving the first partial voltage signal or the oscillation signal; and a second LED array to emit a light with a second color temperature, wherein the second LED array is actuated while receiving the second partial voltage signal or the oscillation signal.