Patent ID: 11910501
Assignee: SIGNIFY HOLDING B.V.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  F  Y | IPC F  H

Claim 0:
1. A solid-state lighting device comprising:
a first string of light-emitting diodes (“LEDs”) having a first end and a second end, the first string being a plurality of LEDs arranged in series and having multiple junctions configured to convert electrical energy to a bluish optical light;
a second string of LEDs having a first end and a second end, the second string being a plurality of LEDs arranged in series and having multiple junctions configured to convert electrical energy to a reddish optical light, wherein a first end of the second string of LEDs is electrically coupled to the first end of the first string of LEDs in a parallel configuration; and
a red light flux balancing resistor element having a first end and a second end, the first end of the red light flux balancing resistor element being electrically coupled in series to the second end of the second string of LEDs, the second end of the red light flux balancing resistor being electrically coupled to the second end of the first string of LEDs, the second string of LEDs and red light flux balancing resistor series being arranged in parallel with the first string of LEDs and configured to increase current through the second string of LEDs and decrease current through the first string of LEDs in response to an increase of a junction temperature of the second string of LEDs, 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 to generate a predefined desirable color point, 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.