A driver arrangement for a LED lighting device with a LED light source and at least one additional auxiliary module, the driver arrangement comprising: a main power output for providing power to the LED light source; a main LED driver having a main power conversion circuit, the main LED driver connected to the main power output; an auxiliary power output for providing power to the at least one additional auxiliary module; an auxiliary driver coupled to the main power output and the auxiliary power output, wherein the auxiliary driver has an auxiliary power conversion circuit independent from the main LED driver; and a controller for controlling a ratio of delivery of power from the auxiliary driver to the main power output and the auxiliary power output; wherein the main LED driver and the auxiliary driver are both adapted to power the LED light source from the AC mains, characterized in that the controller is adapted to: communicate over a command connection to receive a dimming command for the driver arrangement; and obtain an output power demand of the LED light source in accordance with the dimming command; obtain a power demand of the at least one additional auxiliary module; control the delivery of power in dependence on the power demand of the LED light source and of the at least one additional auxiliary module whereby when the output power demand of the LED light source is greater than a threshold, control the auxiliary driver to not provide power to the LED light source, whereby the main LED driver provides the power to the LED light source; when the output power demand of the LED light source is less than the threshold, and when the sum of the power demand of the at least one additional auxiliary module and the output power demand of the LED light source is less than the threshold, control the auxiliary driver to provide power to the LED light source and to the at least one additional auxiliary module and turn off the main LED driver, wherein a rated maximum power of the auxiliary driver is lower than a rated maximum power of the main LED driver, and wherein the auxiliary driver has a higher efficiency than that of the main LED driver at the set output power lower than the threshold. a main power output for providing power to the LED light source; a main LED driver having a main power conversion circuit, the main LED driver connected to the main power output; an auxiliary power output for providing power to the at least one additional auxiliary module; an auxiliary driver coupled to the main power output and the auxiliary power output, wherein the auxiliary driver has an auxiliary power conversion circuit independent from the main LED driver; and a controller for controlling a ratio of delivery of power from the auxiliary driver to the main power output and the auxiliary power output; wherein the main LED driver and the auxiliary driver are both adapted to power the LED light source from the AC mains, characterized in that the controller is adapted to: communicate over a command connection to receive a dimming command for the driver arrangement; and obtain an output power demand of the LED light source in accordance with the dimming command; obtain a power demand of the at least one additional auxiliary module; control the delivery of power in dependence on the power demand of the LED light source and of the at least one additional auxiliary module whereby when the output power demand of the LED light source is greater than a threshold, control the auxiliary driver to not provide power to the LED light source, whereby the main LED driver provides the power to the LED light source; when the output power demand of the LED light source is less than the threshold, and when the sum of the power demand of the at least one additional auxiliary module and the output power demand of the LED light source is less than the threshold, control the auxiliary driver to provide power to the LED light source and to the at least one additional auxiliary module and turn off the main LED driver, wherein a rated maximum power of the auxiliary driver is lower than a rated maximum power of the main LED driver, and wherein the auxiliary driver has a higher efficiency than that of the main LED driver at the set output power lower than the threshold. communicate over a command connection to receive a dimming command for the driver arrangement; and obtain an output power demand of the LED light source in accordance with the dimming command; obtain a power demand of the at least one additional auxiliary module; control the delivery of power in dependence on the power demand of the LED light source and of the at least one additional auxiliary module whereby when the output power demand of the LED light source is greater than a threshold, control the auxiliary driver to not provide power to the LED light source, whereby the main LED driver provides the power to the LED light source; when the output power demand of the LED light source is less than the threshold, and when the sum of the power demand of the at least one additional auxiliary module and the output power demand of the LED light source is less than the threshold, control the auxiliary driver to provide power to the LED light source and to the at least one additional auxiliary module and turn off the main LED driver, wherein a rated maximum power of the auxiliary driver is lower than a rated maximum power of the main LED driver, and wherein the auxiliary driver has a higher efficiency than that of the main LED driver at the set output power lower than the threshold.