Abstract: A light emitting module, a dimmer system and a controller for color temperature modulation are provided, and the dimmer system includes the light emitting module and the controller coupled to the light emitting module. The light emitting module includes a series of light emitting units. The light emitting unit includes a first light emitting diode (LED) for emitting light of a first color temperature, a second LED for emitting light of a second color temperature, and a switch connected to the second LED in series. The series circuit of the second LED and the switch is connected to the first LED in parallel. The switch is optionally turned on in response to a control signal. The controller optionally enables the light emitting units in a preset order. When enabling one of the light emitting units, the controller conducts the first LED.