Patent ID: 8314571

Claim:
A method of controlling color temperature of a lighting apparatus, the method comprising: generating an alternating current, wherein said alternating current flows in a first direction for a first amount of time and said alternating current flows in an opposite direction for a second amount of time during a period of time; sending said alternating current to a set of light emitting diodes (LEDs) of a lighting apparatus, wherein at least a first subset of the set of LEDs emits a white light with a first color temperature if said alternating current flows in the first direction and at least a second subset of the set of LEDs emits a white light with a second color temperature if said alternating current flows in the opposite direction; cooling the set of LEDs with a unified thermal solution having a cooling capacity that is smaller than a sum of a maximum heat generated by the first subset of the set of LEDs and a maximum heat generated by the second subset of the set of LEDs; and controlling a ratio of said first amount of time to said second amount of time to control a color temperature of light emitted by the lighting apparatus during said period of time.