A power supply circuit, comprising: a first drive circuit configured to generate a drive current for a first solid state light source load and for a second solid state light source load to cause the first solid state light source load and the second solid state light source load to illuminate so that a combined light is emitted by the first solid state light source load and by the second solid state light source load, a portion of the drive current flowing through the second solid state light source load and another portion of the drive current flowing through the first solid state light source load; a feedback and control circuit configured to receive feedback only from the first solid state light source load and to control the first drive circuit based on the feedback; characterized in that the power supply circuit further comprises: a second drive circuit configured to control the portion of the drive current flowing through the second solid state light source load; and a master controller configured to provide a first input to the feedback and control circuit to control the portion of the drive current flowing through the first solid state light source load and a second input to the second drive circuit, wherein the second drive circuit is configured to control the portion of the drive current flowing through the second solid state light source load based on the second input. a first drive circuit configured to generate a drive current for a first solid state light source load and for a second solid state light source load to cause the first solid state light source load and the second solid state light source load to illuminate so that a combined light is emitted by the first solid state light source load and by the second solid state light source load, a portion of the drive current flowing through the second solid state light source load and another portion of the drive current flowing through the first solid state light source load; a feedback and control circuit configured to receive feedback only from the first solid state light source load and to control the first drive circuit based on the feedback; characterized in that the power supply circuit further comprises: a second drive circuit configured to control the portion of the drive current flowing through the second solid state light source load; and a master controller configured to provide a first input to the feedback and control circuit to control the portion of the drive current flowing through the first solid state light source load and a second input to the second drive circuit, wherein the second drive circuit is configured to control the portion of the drive current flowing through the second solid state light source load based on the second input. a second drive circuit configured to control the portion of the drive current flowing through the second solid state light source load; and a master controller configured to provide a first input to the feedback and control circuit to control the portion of the drive current flowing through the first solid state light source load and a second input to the second drive circuit, wherein the second drive circuit is configured to control the portion of the drive current flowing through the second solid state light source load based on the second input.