An apparatus and method for driving and adjusting light is provided, applicable to an LED lighting environment. Without the necessity to change the existing wiring and lighting devices, the apparatus and method for driving and light adjusting apparatus of the present invention can enable the LED driver to adjust light so that the LED lighting device is capable of light adjustment. The apparatus and method for driving and adjusting light of the present invention lets the LED driver output stably drive LED when the input voltage to the LED driver changes so that the LED brightness can maintain stable without flickering regardless of the unstable input voltage as well as with high efficiency and low variation of LED color temperature. In this manner, in addition to the lighting capability, the LED lighting device also has the light adjustment capability because the LED driver has the light adjustment capability.