Patent ID: 8258720

Claim:
A power circuit for use in connection with a LED lamp having lighting elements, comprising: a power converter that is configured for converting AC power to pulsed DC power; and an active current limiting control circuit that is electrically connected in series with the lamp, the active current limiting control circuit receiving the pulsed DC power, the active current limiting control circuit configured to impose a maximum threshold on the current delivered to each lighting element of the LED lamp during a fractional portion of each power cycle when voltage across the active current limiting control circuit and lighting elements of the LED lamp equals or exceeds the total required voltage drop such that the lamp turns ON, the active current limiting control circuit further configured for providing a constant current essentially unaffected by temperature variations, wherein the power circuit is configured to deliver pulsed DC power to the solid state lamp such that the solid lamp operates at about 50% duty cycle or greater from an AC line frequency.