Patent ID: 8441198

Claim:
A method for driving a light-emitting diode comprising the steps of: providing a rectifying circuit to receive power from a voltage source and provide a pulsed direct current (DC) voltage source; providing a current source circuit to provide a loop current corresponding to different current levels of a positive part of the voltage source; and placing a plurality of LED modules under control of a plurality of current guiding control circuits in such a manner that the respective LED modules emit light upon being driven by the respective current guiding control circuits, wherein each of the current guiding control circuits includes at least two transistors to constitute at least two switch circuits to selectively permit electric current to flow therethrough in response to a predetermined current level applied thereto, with the respective current guiding control circuits being responsive to different predetermined current levels; whereby the respective LED modules are driven to emit light within a cycle of AC mains power, in the case where the voltage level applied to the current guiding control circuits corresponding thereto reaches the predetermined current levels.