Methods and apparatus for controlling multiple light sources via a single regulator circuit to provide variable color and/or color temperature light

An apparatus, comprising:

• a controllable DC source;
• a switch branch coupled to the controllable DC source and comprising at least one switch and at least one first LED;
• a filtering circuit comprising:
• at least one inductor coupled to the at least one switch;
• at least one filter capacitor coupled to the at least one inductor;
• and
• at least one second LED coupled to the at least one inductor and the at least one filter capacitor, wherein the at least one second LED forms a freewheeling branch;
• a load branch;
• and
• a feedback control circuit for changing a duty cycle of the at least one switch to provide a regulated voltage or regulated current to the load branch, wherein changing the duty cycle of the at least one switch alters a first magnitude of first light generated by the at least one first LED and a second magnitude of second light generated by the at least one second LED.