Dimming module and solid state lighting device

A solid state lighting device, comprising:

• a first lighting module comprising a first color temperature;
• a second lighting module comprising a second color temperature different from the first color temperature;
• a first driving circuit configured to provide a first current to drive the first lighting module according to a first control voltage signal, wherein the first current is configured to control a first luminosity of the first lighting module;
• a second driving circuit configured to provide a second current to drive the second lighting module according to a second control voltage signal, wherein the second current is configured to control a second luminosity of the second lighting module;
• a processing circuit, configured to receive a dimming command and adjust the first control voltage signal and the second control voltage signal according to the dimming command, wherein when the first luminosity and the second luminosity are configured to be larger than a critical luminosity value, the first control voltage signal and the second control voltage signal are configured to control a phase delay angle of the first current and of the second current respectively to adjust the first luminosity and the second luminosity;
• and
• a rectifying circuit, configured to convert an AC voltage to a rectified voltage;
• wherein the processing circuit comprises a zero-crossing detecting unit electrically coupled to the rectifying circuit and configured to detect a zero crossing point of the rectified voltage, such that the first control voltage signal output by the processing circuit is synchronized with the rectified voltage;
• wherein the first driving circuit and the second driving circuit are electrically coupled to the rectifying circuit and configured to receive the rectified voltage to provide the first current and the second current respectively.