Patent ID: 8120279
Filing Date: 2012-02-21
Classification: F21K,F21Y,H05B

Abstract:
1. A color adjustable lamp comprising: at least two light sources for emitting light having a different color; and a lamp driving circuit for receiving a varying supply voltage and for controlling the at least two light sources, wherein the lamp driving circuit is configured to control at least one of a color and a total intensity of the light emitted by the lamp on the basis of a shape of the varying supply voltage, and wherein the lamp driving circuit comprises: a ballast control circuit configured to receive the varying supply voltage and to output a lamp control signal for each light source corresponding to the shape of the varying supply voltage; and a lamp ballast circuit for each of the at least two light sources, each lamp ballast circuit being configured to receive the varying supply voltage and said corresponding lamp control signal for outputting a light source supply voltage corresponding to said lamp control signal in order to control the light intensity of each light source.