Patent ID: 8779687

Claim:
An LED based illumination device, comprising: a first LED string comprising a first plurality of LEDs coupled in series, wherein a first current supplied to the first LED string causes a light emission from the LED based illumination device with a first Correlated Color Temperature (CCT); a second LED string comprising a second plurality of LEDs coupled in series, wherein the second current supplied to the second LED string causes a light emission from the LED based illumination device with a second CCT; and a current router comprising, a first node coupled to a current source, the current router operable to receive a current signal on the first node, a second node coupled to the first LED string, a third node coupled to the second LED string, the current router operable to selectively route a first portion of the current signal as the first current to the first LED string over the second node and a second portion of the current signal as the second current to the second LED string over the third node based on a property of the current signal.