Method and apparatus for providing a passive color control scheme using blue and red emitters

A method of generating a predefined desirable color point using a solid-state lighting device comprising:

• arranging in a series configuration a first string of light-emitting diodes (“LEDs”), having a first end and a second end and having multiple junctions configured to convert electrical energy to a bluish optical light;
• arranging in a series configuration a second string of LEDs having a first end and a second end and having multiple junctions configured to convert electrical energy to a reddish optical light,
• arranging in a parallel configuration the first end of the second string of LEDs to be electrically coupled to the first end of the first string of LEDs;
• and
• arranging in series with the second end of the second string of LEDs a red light flux balancing resistor element having a first end and a second end, wherein the first end of the red light flux balancing resistor element is electrically coupled to the second end of the second string of LEDs, and wherein the first end of the red flux balancing resistor is electrically coupled to a negative terminal of an LED of the first string of LEDs;
• arranging in parallel with the second end of the first string of LEDs the second end of the red light flux balancing resistor, wherein the second string of LEDs and red light flux balancing resistor series are arranged in parallel with the first string of LEDs;
• increasing a current through the second string of LEDs and decreasing a current through the first string of LEDs in response to an increase of a junction temperature of the second string of LEDs;
• and
• generating the predefined desirable color point using the red light flux balancing resistor element, wherein the red light balancing resistor element includes a passive resistor element having a predefined value based on one or more physical properties of at least one of the first and second strings of LEDs.