Patent ID: 7288902
Filing Date: 2007-10-30
Classification: H03K,H05B,Y02B,Y10S

Abstract:
1. A lighting device comprising: two input terminals to receive a dimmer signal from a dimmer and alternating current (AC) power, wherein the dimmer signal indicates a dimming level; a first light source having a stable first color temperature; a second light source having a stable second color temperature; a light source driver, coupled to the first light source and the second light source and to the input terminals to supply a first drive current to the first light source and a second drive current to the second light source; and a light source driver controller, coupled to the light source driver, to cause the light source driver to vary the first and second drive currents in response to changes in the dimming level indicated by the dimmer signal, wherein varying the first and second drive currents varies a color temperature of the lighting device.