Patent ID: 8669704

Claim:
An LED lamp comprising: a lamp vessel, a heat sink at least partially disposed within the lamp vessel, the space surrounded by the lamp vessel being divided into a number of compartments, each of which is at least in part confined by a wall of the lamp vessel and the heat sink, and a LED light source, comprising: a first rectifier with a first and a second input terminal for connection to an AC supply voltage source and a first and a second output terminal and a first LED-string comprising a first plurality of LEDs coupled between the first output terminal and second output terminal, a second rectifier having a first and a second input terminal and output terminals, said first input terminal of said second rectifier being coupled to the first input terminal of the first rectifier and the second input terminal of the second rectifier being coupled to the second input terminal of the first rectifier, and a second LED string comprising a first plurality of LEDs being coupled between the output terminals, and means for causing a phase shift between the voltages that are present during operation at the output terminals of the first rectifier and the output terminals of the second rectifier respectively, wherein the first and second plurality of LEDs are connected to the heat sink and are distributed over at least some of the compartments.